Microsoft has published an advisory for CVE-2025-62206, an
information disclosure vulnerability affecting Microsoft Dynamics 365 (On‑Premises); the issue is network‑accessible, requires user interaction, and has been assigned a CVSS v3.1 base score of
6.5 (Medium) with a confidentiality impact rated high — Microsoft’s advisory and third‑party trackers indicate a vendor patch is available as of the advisory date and administrators should treat this as a high‑priority information‑security item.
Background / Overview
Microsoft Dynamics 365 (On‑Premises) is widely used by enterprises for CRM, operations and integrated line‑of‑business workflows. Over the last 18 months the Dynamics family has been targeted by a string of information‑disclosure and cross‑site scripting advisories; defenders should therefore treat new Dynamics disclosures as potentially high‑value reconnaissance for attackers. Public vulnerability trackers list several Dynamics 365 on‑premises issues in 2024–2025, and the product’s patch cadence has included multiple cumulative fixes addressing XSS and information‑leak classes of bugs. CVE‑2025‑62206 is described in vendor and aggregator summaries as an information disclosure that allows an
unauthorized actor to disclose sensitive information over a network from Dynamics 365 (On‑Premises). The published CVSS vector indicates the attack can be triggered remotely and requires user interaction, while requiring no privileges; the confidentiality impact is the primary concern. Administrators should assume sensitive rows, configuration artifacts, or integration tokens could be exposed until their environments are validated and patched.
What the advisory says (concise, verifiable facts)
- Affected product: Microsoft Dynamics 365 (On‑Premises) (product branches reported in vendor/aggregator feeds as the 9.1 line in several trackers).
- Vulnerability class: Information disclosure (CWE‑200 / exposure of sensitive information).
- Attack vector and prerequisites: Network, user interaction required, no privileges required (per the CVSS vector published by trackers).
- CVSS v3.1 base score: 6.5 (Medium) with Confidentiality = High.
- Patch status: Vendor update reported available on or shortly after the advisory publication (administrators should confirm the exact KB/patch mapping in Microsoft’s Security Update Guide).
Note: Microsoft’s Security Update Guide (MSRC) is the authoritative source for KB IDs and download packages, but the MSRC web app is dynamic (JavaScript‑rendered). Automated scrapers sometimes miss the precise KB-to‑CVE mapping; operators must open the MSRC advisory in an interactive browser session to capture the exact patch identifiers for their environment.
Technical analysis — what “information disclosure” likely means here
Information disclosure vulnerabilities in Dynamics frequently manifest in a few recurring patterns:
- A web/API endpoint returns more fields than intended (excessive output) or responds to crafted query parameters with rows that should be restricted by ACLs. Attackers can enumerate or coerce responses to reconstruct secrets or PII.
- Misused or misconfigured implementation artifacts (templates, FastTrack assets, sample configs) accidentally include tokens, keys or environment metadata that, when reused in production, leak secrets. Past Dynamics FastTrack disclosures demonstrate this risk pattern.
- Cross‑site scripting or DOM manipulation bugs sometimes accompany disclosure issues by enabling attackers to trick legitimate users into triggering behavior that exfiltrates data (the "user interaction" element in the vector). Several August 2025 Dynamics advisories combined XSS and information disclosure issues in this way.
For CVE‑2025‑62206 the published CVSS vector (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N) indicates the exploit path is remote and relatively low complexity, but
requires the target to perform an action (click a URL, open a crafted record or otherwise interact). The primary operational risk is exfiltration of confidential fields (customer PII, contact lists, integration tokens, or configuration details).
Attack scenarios and business impact
Even though this is not a remote code execution vulnerability, the real‑world consequences can be severe:
- Targeted phishing and social engineering: Harvested contact lists and customer metadata are high‑value for attackers mounting targeted scams or credential‑harvesting campaigns. Exfiltrated email lists accelerate phishing campaigns that produce follow‑on breaches.
- Token and credential reuse: Integration artifacts or example tokens discovered in FastTrack or deployment templates can be reused across services (SharePoint, Power Automate, external connectors). Attackers who obtain reusable tokens substantially lower the effort required for lateral movement.
- Regulatory exposure and notification obligations: If PII is disclosed, organizations may face data‑breach reporting obligations under GDPR, CCPA or sectoral rules — triggering legal, remediation and reputational costs.
- Chained attacks: Information disclosure often functions as the reconnaissance phase for privilege escalation, credential stuffing, or supply‑chain compromise. Attackers can combine leaked configuration metadata with other vulnerabilities to extend footholds.
Because disclosure can be silent and low‑noise, defenders often discover the impact late; the consequence is that
“information only” CVEs can — in practice — enable far more damaging intrusions.
Vendor response and verification steps
Microsoft has published the Security Update Guide entry for CVE‑2025‑62206 (the MSRC entry is the authoritative advisory), and multiple threat‑intelligence aggregators picked up the advisory the day of publication; at least one aggregator reports a vendor patch was available on the advisory date. Administrators must still confirm the KB/patch mapping for their exact Dynamics 365 on‑premises branch in the MSRC Update Guide and download the matching cumulative update or hotfix. Practical verification steps:
- Open the MSRC Security Update Guide advisory for CVE‑2025‑62206 in an interactive administrator workstation browser and record the exact KB or package ID (do not rely solely on third‑party scrape copies).
- Cross‑check the KB ID against your update management system (WSUS, Intune, SCCM, Microsoft Update Catalog) and confirm the package applies to your installed Dynamics 365 build (for example, 9.1.x vs another servicing branch).
- Review the published update notes and apply the patch in a test environment before wide deployment; validate functionality and backward compatibility.
Caveat: Some public trackers show multiple related Dynamics CVEs (FastTrack assets, XSS and information disclosure variants) and earlier incidents exposed mismatches between a supplied MSRC URL and the CVE token displayed; this has led to confusion in incident response. Confirm the CVE ID and KB directly in the MSRC entry.
Immediate 24–72 hour playbook for IT and security teams
If you run Dynamics 365 On‑Premises, follow this prioritized checklist immediately:
- Inventory and prioritize
- Identify all on‑premises Dynamics 365 servers and the installed product/build version. Tag internet‑facing instances and management interfaces as highest priority.
- Verify vendor advisory and obtain patch
- Open the MSRC CVE‑2025‑62206 advisory and confirm the KB/CU that addresses your product build; download the vendor package.
- Apply in test, then staged rollout
- Patch a test instance, run functional tests and regression checks (integrations, custom plugins, UI customizations). After validation, roll the update through your change control window.
- Implement compensating controls while patching
- Restrict access via IP allow‑lists or VPN to administrative endpoints. Place an application‑layer Web Application Firewall (WAF) in front of external Dynamics UI or API endpoints and tune rules to block suspected enumeration patterns and long encoded payloads.
- Rotate secrets and credentials at risk
- If any FastTrack artifacts, sample configs, or recent logs indicate possible exposure of tokens or service credentials, rotate those secrets immediately and track the rotation in your change log.
- Increase logging and retention for hunting
- Preserve IIS, Dynamics auditing, database access logs and any application logs covering the vulnerable window; feed them to SIEM for pattern analysis (enumerative requests, repeated startswith/substring queries, spikes in record reads).
- Communication and regulatory readiness
- Prepare incident notification templates and legal/compliance briefings should forensic review confirm PII exposure. Document decisions and timelines in case regulators request evidence of due diligence.
Detection and hunting guidance (practical queries and indicators)
Information‑disclosure exploitation often leaves subtle traces. Prioritize these hunts:
- Search IIS/web server logs for long or unusually encoded query strings, repeated GET/POST sequences that change a substring (evidence of startswith‑style enumeration), or abnormal request frequency from a single client.
- Query Dynamics auditing and SQL logs for sudden spikes in reads on sensitive entities (contacts, notes, custom tables), especially by non‑admin or anonymous web contexts.
- Look for unusual export jobs, print jobs, or bulk retrievals scheduled or triggered outside business hours. Attackers often attempt low‑noise bulk exports immediately after a successful disclosure.
- Alert on outbound connections from application or browser contexts not normally observed (evidence of exfiltration to remote attacker endpoints).
If hunting reveals suspicious activity during the vulnerable window, proceed to containment: isolate the affected host(s), preserve full forensic images, and rotate exposed credentials.
Patch deployment — operational checklist
- Confirm patch applicability: match KB/CU to Dynamics build and installed plugins (including third‑party extensions).
- Back up application databases and configuration prior to patching.
- Apply patch in a representative test environment, validate connectors (Power BI, connectors to ERP, SharePoint), and test customizations and plugin behavior.
- Deploy in stages: non‑production → pilot group → full production, monitoring telemetry and user reports after each stage.
- Verify patch installation through your management console (WSUS/SCCM/Intune) and by checking file/service version numbers where vendors provide verification steps.
Strengths and weaknesses of the public advisory posture (critical analysis)
Strengths:
- Centralized advisory: Microsoft’s Security Update Guide is the canonical repository for mapping CVEs to KBs, enabling consistent identification of the vendor‑approved remediation. Aggregators and defenders can use this to prioritize updates.
- Rapid pickup by threat‑intelligence aggregators: multiple trackers catalogued CVE‑2025‑62206 quickly, which helps defenders realize scope and urgency.
Weaknesses and risks:
- MSRC dynamic UI limitations: Because the MSRC Update Guide is a JavaScript application, some automated scrapers or third‑party feeds can render incomplete or inconsistent representations of the advisory (including CVE/KID mismatches). This has already caused confusion in past Dynamics advisories and can slow incident response if teams rely on scraped copies rather than opening the MSRC entry directly.
- Sparse exploitability detail: Vendor advisories often avoid publishing exploit recipes; while defensible, this leaves defenders to make conservative assumptions — which may lead to aggressive patching windows, operational risk, or missed compensating controls if incorrect assumptions are made.
- Information disclosure is a silent enabler: Organizations that deprioritize non‑RCE CVEs because they "only leak data" frequently underestimate the downstream risk: leaked tokens, contact lists and configs accelerate large‑scale phishing and lateral movement.
Cross‑verification and evidence gaps (what’s confirmed vs. uncertain)
Confirmed:
- The CVE identifier CVE‑2025‑62206 appears in MSRC’s Security Update Guide and third‑party trackers as an information disclosure affecting Dynamics 365 (On‑Premises), with a CVSS base of 6.5.
- Aggregators report a vendor patch was published concurrent with the advisory; administrators should still confirm the exact KB in MSRC.
Unverified / cautionary points:
- The specific implementation details (the exact endpoint, sample exploit sequence or whether the disclosure includes tokens vs. PII) are not published in detailed form by the vendor; publicly available descriptions are intentionally concise to avoid arming attackers. Where third‑party write‑ups infer mechanics, these should be treated as research hypotheses until multiple authoritative sources corroborate them.
- Some earlier Dynamics advisories have shown mismatches between MSRC URLs and CVE tokens due to dynamic rendering or editorial changes; treat any CVE identifier you received via indirect channels as provisional until validated in MSRC.
Practical mitigations beyond patching
While patching is the primary fix, apply the following to reduce blast radius and buy time for complete remediation:
- Enforce network segmentation: restrict administrative endpoints to management VLANs and jump hosts. Limit internet exposure of Dynamics UI and API endpoints (block direct public access where feasible).
- Use WAF rules to block obvious enumeration and encoded payloads; tune rules to reduce false positives.
- Harden identity and access: require multi‑factor authentication for Dynamics admin accounts, restrict service account privileges, and reduce long‑lived tokens.
- Rotate keys and secrets that may have been present in FastTrack artifacts, automation packages or deployment templates. Record rotations for audit.
- Increase audit retention: Dynamics and IIS logs should be retained longer than typical baselines (90 days recommended) to support retrospective investigations.
How to confirm your environment is protected (post‑patch validation)
- Confirm the update package / KB applied successfully using your management tooling (SCCM, WSUS, Intune) and by checking the file/service versions documented in the vendor KB.
- Run controlled, non‑destructive QA checks: issue test requests from a non‑privileged account to the updated endpoints to ensure the previous disclosure behavior no longer returns excess fields. Perform these checks in a controlled lab — do not attempt public exploitation.
- Audit logs for anomalous reads during the vulnerable timeframe; any evidence of automated enumeration or unusual exports should trigger full incident response and secret rotation.
Conclusion — prioritized actions (what to do now)
- Immediately verify the MSRC advisory and capture the exact KB/CU identifier for CVE‑2025‑62206 in an interactive admin browser session and download the matching package for your Dynamics 365 build.
- Apply the update first to test and pilot systems, then stage the production rollout following your change management process.
- While patching, implement compensating controls (restrict network exposure, WAF, rotate high‑value secrets, enable MFA on admin accounts) and increase log retention for forensic readiness.
- Hunt for indicators of enumeration or exfiltration in IIS, Dynamics auditing and DB logs; preserve evidence and prepare legal/compliance communications if PII exposure is suspected.
Treat CVE‑2025‑62206 as an urgent operations item: the vulnerability’s
information disclosure nature makes it an ideal reconnaissance vector for attackers, and unpatched Dynamics instances — especially those exposed to the internet or misconfigured with reused FastTrack artifacts — present an attractive target. Apply the vendor update, validate your environment, rotate any credentials that might have been exposed, and harden logging and monitoring to reduce the risk of follow‑on compromise.
Source: MSRC
Security Update Guide - Microsoft Security Response Center