CVE-2026-66314: CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition in Microsoft Microsoft Edge (Chromium-based)
Time-of-check time-of-use (toctou) race condition in Microsoft Edge (Chromium-based) allows an unauthorized attacker to disclose information over a network.
AI Analysis
Technical Summary
This vulnerability involves a TOCTOU race condition in Microsoft Edge (Chromium-based) that could be exploited by an unauthorized attacker to disclose sensitive information over a network. The flaw arises from a timing issue between checking a condition and using the result, potentially allowing information leakage. Microsoft has published an official fix to remediate this vulnerability.
Potential Impact
An attacker who successfully exploits this TOCTOU race condition could disclose sensitive information over a network without requiring privileges, though user interaction is needed. The vulnerability does not allow integrity or availability impacts but results in a confidentiality breach.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided by Microsoft as detailed in the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66314 to remediate this vulnerability.
CVE-2026-66314: CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition in Microsoft Microsoft Edge (Chromium-based)
Description
Time-of-check time-of-use (toctou) race condition in Microsoft Edge (Chromium-based) allows an unauthorized attacker to disclose information over a network.
CVSS v3.1
Score 6.5medium
Affected software
Microsoft
Microsoft Edge (Chromium-based)
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves a TOCTOU race condition in Microsoft Edge (Chromium-based) that could be exploited by an unauthorized attacker to disclose sensitive information over a network. The flaw arises from a timing issue between checking a condition and using the result, potentially allowing information leakage. Microsoft has published an official fix to remediate this vulnerability.
Potential Impact
An attacker who successfully exploits this TOCTOU race condition could disclose sensitive information over a network without requiring privileges, though user interaction is needed. The vulnerability does not allow integrity or availability impacts but results in a confidentiality breach.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided by Microsoft as detailed in the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66314 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-07-24T18:06:51.295Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66314","vendor":"Microsoft"}]
Threat ID: 6a7121fcbf32cb7a3462c061
Added to database: 08/03/2026, 23:19:24 UTC
Last enriched: 08/11/2026, 14:59:28 UTC
Last updated: 09/18/2026, 01:04:25 UTC
Views: 51
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