Dynamics 365 FastTrack Info-Disclosure: CVE-2025-49715 Advisory

Microsoft has published an advisory for an information‑disclosure flaw affecting Dynamics 365 FastTrack Implementation Assets that can allow an attacker to disclose private personal information over a network — but the public record and vendor sources show a mismatch in the CVE identifier, so organizations must verify the exact advisory entry in Microsoft’s Security Update Guide and apply recommended fixes immediately. (msrc.microsoft.com) (nvd.nist.gov)

Background​

Microsoft’s FastTrack program and accompanying implementation assets are designed to help customers deploy and configure Dynamics 365 solutions quickly. The public GitHub repository for Dynamics‑365‑FastTrack‑Implementation‑Assets documents templates, guidance, and scripts that many teams reuse during deployments; because those artifacts sometimes contain sample configuration and automation code, they can expose sensitive metadata or configuration if not handled correctly. (github.com)
On June 20, 2025, a Dynamics‑related information disclosure entry appeared in public vulnerability feeds describing an issue in Dynamics 365 FastTrack Implementation Assets that “allows an unauthorized attacker to disclose information over a network.” Multiple vulnerability trackers list the vulnerability (often under CVE‑2025‑49715 in public registries) with a High base severity and a CVSSv3.1 vector indicating network‑accessible, no privileges required and a high confidentiality impact. (nvd.nist.gov, cvedetails.com)
Important: the MSRC URL you supplied rendered a JavaScript page (the Update Guide is delivered as a dynamic web app), which can obscure the plain text advisory when scraped. That page indicator is returned by Microsoft’s site, so administrators should open the MSRC advisory directly in an interactive browser (from a secure admin workstation) to capture the exact remediation KB/CU or guidance for their environment. (msrc.microsoft.com)

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What the public records say (quick facts)​

• Affected component: Dynamics 365 FastTrack Implementation Assets (FastTrack assets and associated implementation artifacts). (cvedetails.com)
• Published / first public entry: reported in mid‑June 2025 (public records show a June 20, 2025 publication date). (cvedetails.com)
• Impact: Exposure of private personal information; confidentiality impact scored high in vendor/aggregator feeds. (nvd.nist.gov, cvedetails.com)
• CVSS (as published in trackers): CVSS v3.1 = 7.5 (High) with vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N. This indicates remote, network access with no privileges or user interaction required to trigger disclosure in the worst case. (cvedetails.com, incibe.es)
• Public CVE identifier discrepancies: public trackers consistently reference CVE‑2025‑49715 for the FastTrack issue, while the URL you supplied references a different CVE token (CVE‑2025‑55238). The latter identifier does not appear in major public vulnerability feeds at the time of reporting; this suggests either a typo in the URL or that MSRC’s dynamic page may render different IDs depending on context. Administrators should confirm the CVE number on the MSRC page in a browser and cross‑check NVD/CVE aggregation feeds. (msrc.microsoft.com, nvd.nist.gov)

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Technical overview and likely root cause​

The vendor and aggregator descriptions classify the issue under exposure of private personal information (CWE‑359 / information disclosure). That class of bugs typically arises from one of the following implementation errors:

• A server endpoint or script echoing sensitive fields in responses without proper access control or filtering.
• Misconfiguration or hardcoded example artifacts in implementation packages that inadvertently publish secrets or PII when reused in production.
• Weak input/output sanitization in scripts or templates that allows an attacker to coerce the system into returning rows or records that would otherwise be restricted.

Public CVE entries and vendor text do not publish an exploit recipe; the high confidentiality rating and the CVSS vector indicate a remotely accessible disclosure where an unauthenticated or low‑privilege network actor can retrieve sensitive fields. That pattern maps to common Dynamics incidents where web resources, API endpoints, or exported artifacts leak contact lists, notes fields, or integration tokens. (nvd.nist.gov, cvedetails.com)
Caveat: Microsoft’s Update Guide entries for Dynamics issues are often intentionally terse to avoid serving would‑be attackers. Public trackers sometimes fill in the risk posture and CVSS vector. Where the vendor does not publish exploitability detail, defenders must assume an adversary can chain the disclosure into phishing, token reuse, or downstream pivoting attacks. (incibe.es, vulners.com)

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Attack scenarios and real‑world impact​

Even an information disclosure vulnerability can be high business impact when the leaked data contains credentials, tokens, environment metadata, or personally identifiable information. Relevant scenarios include:

• Harvesting contact and customer lists for targeted phishing campaigns and fraud. Stolen contact lists are high value for social engineering and account takeover attempts. (cvedetails.com)
• Leaking integration secrets or API tokens embedded in FastTrack artifacts that are reused by administrators or automation. Reused tokens enable lateral movement into other services (SharePoint, Power Automate, external connectors).
• Privilege escalation via chained exploits. Disclosure of configuration or service account names often lowers the bar for forging or escalating access. The disclosed metadata may reveal endpoints that, when combined with other vulnerabilities, create full compromise chains.
• Regulatory and compliance consequences. Exposure of personal data may trigger breach notification obligations under privacy regulations (GDPR, CCPA, sectoral rules), with reputational and legal risk.

Historically, Dynamics‑family disclosures are used by attackers to build follow‑on campaigns instead of immediate ransomware-style incidents. Treat information disclosure as a high‑value reconnaissance outcome that enables more damaging activity later. (vulners.com)

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Detection and hunting guidance​

Because information‑disclosure exploits often generate low noisy telemetry, detection must target subtle indicators and behavioral patterns.

• Search application and IIS logs for unusual parameter patterns (base64 blobs, long query strings, repeated reads of specific fields). Look for GET/POST sequences that attempt to enumerate records or filter on fields that should be restricted.
• Hunt for repeated queries that incrementally enumerate content (patterned queries that vary a substring of a value to brute‑force a field). Attackers sometimes reconstruct hashes or strings with startswith/substring queries.
• Review recent changes to FastTrack artifacts, templates, and automation scripts stored in Git repositories or deployment packages. Unexpected additions or commits that expose environment variables, connection strings, or sample tokens should be investigated. (github.com)
• Correlate Dynamics UI sessions: spikes in reads of sensitive entities, sudden expansions of export/print jobs, or admin‑context views of records may indicate automated enumeration after a successful injection.
• Use Defender/EDR and SIEM rules to alert on outbound connections from browser contexts or server processes that are not normally observed (evidence of exfiltration to attacker endpoints).

Triage checklist (quick):

• Identify recently accessed records containing PII.
• Preserve logs (IIS, SQL, Dynamics auditing) for forensic review.
• Rotate service credentials and integration tokens if suspicion is confirmed.
• Snapshot vulnerable endpoints and isolate if active exploitation is suspected.

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Mitigation and remediation — immediate steps (priority order)​

• Confirm the advisory on MSRC: open the Microsoft Security Update Guide entry in an interactive browser from a secure administrative workstation, note the CVE number, affected products, and the exact KB/CU or patch identifiers for your deployment type (FastTrack assets may be surfaced as GitHub content, downloadable packages, or a product guidance entry). Do not rely solely on third‑party scraped copies for the KB name. (msrc.microsoft.com, github.com)
• Apply vendor updates: If Microsoft has published a patch or updated the FastTrack assets repository, apply the update in a test environment and roll forward following your change management process. For on‑prem Dynamics, install the specified cumulative update or hotfix that Microsoft lists for the CVE. For hosted or managed FastTrack artifacts, follow vendor guidance for pull/replace of updated templates. (cvedetails.com, github.com)
• Compensating controls if patching is delayed:
• Restrict network exposure to Dynamics management and FastTrack endpoints behind VPN or IP allow‑lists.
• Place a Web Application Firewall (WAF) in front of affected web endpoints and tune rules to block suspicious patterns (long encoded payloads, repeated enumeration queries).
• Remove or reconfigure any sample implementation packages or artifacts that may contain example credentials or tokens.
• Enforce MFA for Dynamics admin and privileged accounts and reduce session lifetimes where possible.
• Rotate secrets: If there is any chance that tokens, service account credentials, or integration keys were exposed, rotate them immediately and log the rotation for post‑incident validation.
• Harden logging and monitoring: Enable or increase retention for Dynamics auditing, SQL/Audit traces, and web server logs so that a complete timeline can be reconstructed if a disclosure is detected. Feed relevant events into your SIEM and tune detection rules.
• Communicate and prepare IR: Notify stakeholders, prepare incident response playbooks for possible PII exposure, and be ready to engage legal/compliance teams if personal data is confirmed exfiltrated.

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Verification steps — how to confirm your environment is protected​

• After patch deployment, validate patch status via your endpoint management tool (SCCM, Intune, WSUS) or by checking file versions and service versions against Microsoft’s KB/patch notes. Use vendor-provided verification steps where available. (msrc.microsoft.com, cvedetails.com)
• Sanity check: run test requests from a non‑privileged account to the relevant endpoints to ensure the previous disclosure behavior is no longer observable. Implement this as part of a controlled QA run rather than a public exploit attempt.
• Audit telemetry post‑patch for repeated anomalous access patterns during the vulnerable window; if evidence of exploitation exists, proceed with containment and full IR. Rotate keys and notify impacted parties as required by law.

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Cross‑verification and citation note (why different trackers show different CVE IDs)​

Multiple high‑quality trackers (NVD, CVEDetails, INCIBE, and community aggregators) publish entries for a Dynamics FastTrack information‑disclosure issue under CVE‑2025‑49715 with consistent payload descriptions, CVSS scoring, and a June 20, 2025 publication date. These independent entries align on impact and mitigation advice. (nvd.nist.gov, cvedetails.com, incibe.es)
The MSRC Update Guide entry you supplied returned a dynamic content placeholder (the MSRC site is a JavaScript app). That page may require interactive opening to reveal the KB or exact advisory mapping; it is not uncommon for early advisory URLs or cross‑linked CVE tokens to vary or be updated by the vendor during the disclosure window. At the time of this article, a CVE with the exact number CVE‑2025‑55238 did not appear in major public trackers, whereas the FastTrack disclosure is consistently indexed as CVE‑2025‑49715. Treat the CVE number in the MSRC URL as potentially incorrect or a transient rendering artifact and verify on Microsoft’s site in a browser. (msrc.microsoft.com, cvedetails.com)

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Strengths and weaknesses of the public advisory posture​

Strengths:

• Microsoft centralized the advisory in the Security Update Guide (authoritative repository for KB and CVE mappings), enabling administrators to locate vendor‑approved fixes and remediation guidance. (msrc.microsoft.com)
• Independent trackers have already cataloged the issue and assigned a high confidentiality impact rating, which helps defenders prioritize investigation and patching. (cvedetails.com)

Weaknesses / risks:

• Early vendor advisory summaries sometimes omit exploitability details and technical reproductions to avoid assisting attackers. That is a defensible practice, but it leaves security teams to infer exploitability and implement potentially disruptive mitigations.
• The CVE identifier discrepancy (your supplied URL vs. public trackers) demonstrates how dynamic advisory pages and redirected URLs can cause confusion during incident response. Always confirm the KB ID and patch digest from the MSRC advisory text. (msrc.microsoft.com)
• Information disclosure bugs can be deceptively dangerous because they create reconnaissance opportunities for attackers; teams that deprioritize “only info leak” CVEs can later suffer chained attacks that lead to full compromise.

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Actionable checklist (for IT/Sec teams) — immediate 24–72 hour playbook​

• Open the MSRC Update Guide advisory in a secure browser session (admin workstation) and record the exact CVE/KP/KB identifiers. Do this now. (msrc.microsoft.com)
• Inventory all locations where FastTrack Implementation Assets are used (local repo mirrors, shared drives, deployment scripts). Mark those systems as high priority for patching/inspection. (github.com)
• If a vendor patch is available, schedule emergency testing and deployment; if not available, implement network restrictions and WAF rules to limit exposure. (cvedetails.com)
• Rotate any secrets or tokens that may be present in FastTrack artifacts and audit repository history for accidental commits of credentials. (github.com)
• Harden Dynamics admin accounts with MFA and reduced privileges; review role assignments and remove unused service accounts.
• Tune SIEM to detect enumerative queries, long‑encoded parameters, and spikes in record reads; preserve logs for at least 90 days to enable post‑incident review.
• Prepare communications for legal/compliance if PII is confirmed exposed; predefine thresholds for escalation and regulatory notification.

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Final assessment and cautionary notes​

This Dynamics 365 FastTrack Implementation Assets vulnerability is an example of how configuration artifacts and implementation templates can become high‑impact attack surfaces when reused in production. While the public descriptors classify the issue as an information disclosure, the CVSS vector indicates network‑accessible leakage with no privileges required, making it actionable and urgent in many environments. The factual cross‑checks in public CVE aggregators show a High severity (CVSSv3.1 = 7.5) and an early June 2025 publication date; use those authoritative facts when prioritizing remediation. (cvedetails.com, incibe.es)
Two important warnings:

• If your team uses the MSRC link you provided, verify the CVE ID and KB directly in the interactive MSRC entry — dynamic pages can render differently for automated scrapers and the CVE token in your URL may be a typo or a transient identifier. (msrc.microsoft.com)
• If you find any evidence that tokens, credentials, or PII were exposed, assume the worst: rotate secrets, isolate affected systems, and perform a full incident response because information disclosure often enables follow‑on compromise.

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Conclusion — prioritized guidance​

• Verify MSRC advisory details in a browser and capture the exact KB/patch identifiers. (msrc.microsoft.com)
• Treat the FastTrack information‑disclosure CVE (public trackers list CVE‑2025‑49715) as High priority; apply vendor updates or implement compensating controls immediately. (cvedetails.com)
• Hunt aggressively for signs of enumeration or exfiltration, rotate exposed credentials, and harden admin access.

This advisory is a reminder that implementation artifacts and deployment scaffolding must be treated as code‑level secrets: they require the same discipline for access control, secrets management, and lifecycle governance as application binaries or infrastructure code. Prioritize verification and remediation now — and confirm the precise CVE/KID mapping in Microsoft’s Update Guide before closing your ticket. (msrc.microsoft.com, cvedetails.com)

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Source: MSRC Security Update Guide - Microsoft Security Response Center