Because Microsoft Edge (the modern, Chromium‑based Edge) is built from the same upstream Chromium codebase as Google Chrome, Microsoft records Chromium‑origin CVEs in the Security Update Guide to state whether and when an Edge release has ingested the upstream Chromium fix. In other words, the Security Update Guide entry for CVE‑2026‑0900 is Microsoft’s downstream status message: it tells administrators and users that the Chromium V8 vulnerability existed upstream and documents whether the current Microsoft Edge build contains the remediation (so Edge is no longer vulnerable).
Why Microsoft does this (short, operational explanation)
- Chromium is an open source project; many browsers (Chrome, Edge, Brave, Opera, etc. share its code.
- When Chromium/Chrome assigns a CVE and publishes a patch, downstream products must merge and ship that patch on their own schedule. That creates a short “window” where Chrome may already be patched upstream but Edge (or other Chromium‑based products) has not yet shipped the change.
- The Microsoft Security Update Guide (SUG) lists these CVEs so that organizations can track the exact remediation status for Microsoft products. The SUG entry functions as Microsoft’s official statement that a particular Edge build includes the upstream fix and therefore that Edge build is considered remediated for the CVE. This is especially important for enterprise compliance, vulnerability tracking, and audit evidence.
What CVE‑2026‑0900 is (high‑level)
- CVE‑2026‑0900 was reported against the V8 JavaScript engine (the component of Chromium that executes JavaScript and WebAssembly). The vendor classification for this class of bug is typically “inappropriate implementation” (a wording Chromium commonly uses when a logic/implementation error can lead to memory corruption or other unsafe behavior).
- Google rolled the fix as part of the Chrome 144 stable release which began rolling out on January 13, 2026. The stable Chrome builds associated with that rollout were 144.0.7559.59 (Linux) and 144.0.7559.59/60 (Windows/macOS). Because Edge consumes Chromium OSS, Microsoft documents CVE‑2026‑0900 in SUG to indicate the ingestion and downstream status for Edge builds.
- As with many V8 fixes, detailed exploitation mechanics and low‑level patch text are typically restricted until a majority of users are updated, to reduce the risk of weaponization. Public reporting often treats these as high‑severity browser engine issues because successful exploitation can lead to code execution or other serious outcomes if chained appropriately.
How to check whether a browser build is vulnerable — practical steps
Below are explicit, platform‑agnostic ways to check
which browser version is installed and the
Chromium/V8 lineage so the installed build can be compared against the fixed build.
A. Quick, manual checks (desktop)
- Google Chrome (Windows / macOS / Linux)
- Open Chrome.
- Menu (three dots) → Help → About Google Chrome.
- Or paste chrome://settings/help in the address bar and press Enter.
- The About page shows the full Chrome product version and triggers an update check.
- For the underlying component versions (Chromium/V8), open chrome://version. That page lists the product version plus lines for “Chromium” and “V8” so the browser’s JavaScript engine version can be inspected.
- Microsoft Edge (Windows / macOS / Linux)
- Open Edge.
- Menu (three dots) → Help and feedback → About Microsoft Edge.
- Or paste edge://settings/help in the address bar and press Enter.
- The About page shows the Edge product version and triggers an update check.
- To inspect the underlying Chromium and V8 lines, open edge://version. That page shows the Edge product version and the underlying Chromium and V8 component versions.
B. Quick, manual checks (mobile)
- Chrome (Android / iOS)
- Android: Chrome → Menu → Settings → About Chrome.
- iOS: App Store shows the installed version; Chrome’s in‑app About may list the version in Settings → About.
- Mobile releases can lag and use different numbering; always compare to the vendor’s mobile release notes.
- Edge (Android / iOS)
- Edge → Settings → About this app (or check the app page in the platform’s app store).
- Mobile variants are updated separately; consult Edge mobile release notes for patch status.
C. Command line / scripted checks (Windows examples)
- To get the product version of MS Edge from PowerShell:
- (Get-Item "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe").VersionInfo.ProductVersion
- To get the product version of Chrome from PowerShell:
- (Get-Item "C:\Program Files\Google\Chrome\Application\chrome.exe").VersionInfo.ProductVersion
- For fleet queries, use software inventory tools (SCCM/ConfigMgr, Intune, BigFix, Munki, JAMF, etc. or run a remote script that queries the executable version or MSI/installer metadata on endpoints.
How to interpret the numbers
- If the installed Chrome/Edge product version is equal to or newer than the fixed build published by the upstream vendor (Chrome), the browser is considered patched for that upstream CVE. For example, Chrome 144 (144.0.7559.59/60) was the Chrome release that contained the fixes for the set of Chrome 144 CVEs.
- For Microsoft Edge, consult the Security Update Guide entry for the CVE or the Edge release notes to see the Edge build number that ingested the Chromium fix. If the Edge product version installed on a host is equal to or newer than the Edge build documented in SUG, the host is remediated for that CVE.
- The chrome://version or edge://version pages present both the product version and the underlying Chromium/V8 lines; that aids teams that map Chromium revisions to V8 branches.
Operational guidance for administrators and security teams
- Treat the SUG entry as the downstream remediation flag. For enterprise reporting, cite the Edge build number listed in SUG as evidence of remediation for Microsoft Edge.
- Patch priority: treat high‑severity V8/engine issues as high priority because a successful exploit can be browser‑based (i.e., a user visiting a web page could trigger the issue). Prioritize internet‑facing endpoints, developer workstations, and privileged user machines.
- Use centralized inventory/patch tools:
- Query installed browser versions across the fleet via SCCM/Intune/BigFix or a configuration management tool. Filter devices where installed Edge/Chrome version < fixed build.
- Create a remediation runbook: test latest Edge in staging, push to pilot group, then deploy to production per the organization’s change control.
- If immediate blocking is required and rolling updates are not feasible:
- Enable and enforce site‑isolation or enhanced security modes where available. These settings can raise exploitation difficulty for some classes of memory corruption.
- Apply network controls to block known malicious domains or risky content categories until endpoints are updated.
- Consider temporary use of application whitelisting or browser confinement (browser in sandbox or VM, or use of isolation/proxy services) for high‑risk users.
Detection, monitoring and indicators
- Watch for abnormal browser crashes or increases in V8‑related crash signatures in endpoint telemetry. Such crashes can be an early sign of attempted exploitation or fuzzing attempts.
- Look for suspicious child processes launched by the browser or unexpected network connections spawned by browser processes, and cross‑reference with timeline and browsing logs.
- Use EDR/endpoint telemetry to search for processes running older browser versions and prioritize them for immediate update.
Common questions / clarifications about SUG entries for Chromium CVEs
- Q: “Does the SUG entry mean Microsoft introduced the bug?”
A: No. SUG includes upstream CVEs because Edge depends on Chromium. The entry communicates Microsoft’s downstream status (ingested or not ingested) and the Edge build that contains the fix.
- Q: “If Chrome is patched, is Edge automatically patched?”
A: Not automatically. Edge follows a downstream ingestion and release process; updates happen on Microsoft’s schedule, which typically follows closely after Chrome patches but not instantaneously. SUG is the authoritative place to confirm when Microsoft considers a given Edge build remediated.
- Q: “How soon should an organization remediate?”
A: Treat high‑severity engine bugs as high priority. Patch as soon as testing allows. If exploitation is reported in the wild, accelerate the rollout immediately.
Practical checklist (copyable)
- Check Chrome/Edge versions on a local machine: chrome://settings/help or edge://settings/help.
- Inspect chrome://version or edge://version to see product, Chromium, and V8 lines.
- Compare installed versions against the fixed build (Chrome 144.0.7559.59/60 for the Chrome 144 rollout that included CVE‑2026‑0900). For Edge, consult SUG or Edge release notes to confirm the Edge build that ingested the Chromium fix.
- Use a fleet query (SCCM/Intune/other) to list devices with older browser versions and schedule an immediate update.
- Enable strict update policies and verify auto‑update is functioning for managed endpoints.
- Monitor for crash spikes or suspicious activity that could indicate attempts to exploit the vulnerability.
Short note about public details and risk posture
- Chromium projects often withhold full technical details until the majority of users are updated to reduce the risk of reverse‑engineering the patch into working exploits. That is why public advisories may show a brief description such as “inappropriate implementation in V8” without low‑level proof‑of‑concept details. Treat the classification and the CVSS/priority scores seriously and assume a worst‑case impact until devices are patched.
Summary (action‑oriented)
- Reason SUG lists CVE‑2026‑0900: Microsoft documents Chromium CVEs to declare the downstream remediation status for Microsoft Edge because Edge ingests Chromium OSS.
- Immediate action: check the installed browser version (chrome://settings/help or edge://settings/help), compare against the patched Chrome/Edge build numbers, and update any out‑of‑date clients.
- Enterprise action: use centralized inventory and update mechanisms to identify noncompliant endpoints, test the updated Edge/Chrome build in staging, and push the patch broadly. Enable additional hardening controls (isolation modes, network restrictions) if immediate update is not possible.
If any additional, platform‑specific commands or an example script for bulk inventory will be helpful, use existing enterprise management tooling to automate version collection and remediation scheduling — this removes guesswork and produces an auditable trail that ties a particular Edge build (the SUG remediation build) to a specific date of deployment across the environment.
Source: MSRC
Security Update Guide - Microsoft Security Response Center