EUVD-2026-41572
GHSA-g4pq-v493-r36h
Severity by source
AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Network-delivered and unauthenticated (AV:N/PR:N) but requires victim interaction (UI:R) and winning a non-deterministic race (AC:H); browser-context code execution yields full C:H/I:H/A:H.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Time-of-check time-of-use (toctou) race condition in Microsoft Edge for Android allows an unauthorized attacker to execute code over a network.
AnalysisAI
Remote code execution in Microsoft Edge for Android (Chromium-based) arises from a time-of-check to time-of-use (TOCTOU) race condition that an unauthenticated network attacker can win to run arbitrary code, though success requires the victim to interact (UI:R) and the timing window makes exploitation high-complexity. Microsoft (self-reported) has shipped an official fix, and the temporal signals (E:U, RC:C) indicate no public exploit identified at time of analysis despite confirmed technical validity. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the victim to actively interact with attacker-supplied content in Microsoft Edge for Android (CVSS UI:R) - e.g., visiting a crafted page or opening malicious content - and requires the attacker to reliably win a time-of-check/time-of-use race window, which the CVSS AC:H rating flags as high-complexity and non-deterministic. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base of 7.5 (AV:N/AC:H/PR:N/UI:R) reflects a network-reachable, unauthenticated flaw with full C/I/A impact, but two factors materially lower real-world risk: AC:H (winning a race is non-deterministic and often unreliable) and UI:R (the victim must take an action, e.g., visit a page or open content). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker hosts a malicious web page and lures an Edge-for-Android user to visit it; while the browser validates a resource, the page's script rapidly mutates the underlying state to win the TOCTOU race, substituting attacker-controlled data before it is used and achieving code execution in the browser context. Because AC:H reflects the timing sensitivity, the attacker likely needs many attempts, and no public exploit has been identified at time of analysis. |
| Remediation | Patch available per vendor advisory: update Microsoft Edge for Android to the fixed release referenced in the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58299 (an exact fixed version number is not included in the supplied data, so obtain it from that page or the Google Play listing). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all organizational Android devices running Microsoft Edge and identify business-critical usage. …
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External POC / Exploit Code
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