CVE-2026-58291: CWE-672: Operation on a Resource after Expiration or Release in Microsoft Microsoft Edge (Chromium-based)
Operation on a resource after expiration or release in Microsoft Edge (Chromium-based) allows an unauthorized attacker to disclose information over a network.
AI Analysis
Technical Summary
This vulnerability, identified as CWE-672, involves performing operations on a resource after it has expired or been released in Microsoft Edge (Chromium-based). This can lead to unauthorized information disclosure over a network. The CVSS 3.1 vector indicates the attack requires network access with high attack complexity, no privileges, and user interaction, but results in a high confidentiality impact without affecting integrity or availability. Microsoft has published an official fix for this issue.
Potential Impact
An attacker can exploit this vulnerability to disclose sensitive information over a network without requiring privileges but with user interaction. The confidentiality impact is high, while integrity and availability are not affected. There are no known exploits in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the provided patch as detailed in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58291 to remediate this vulnerability.
CVE-2026-58291: CWE-672: Operation on a Resource after Expiration or Release in Microsoft Microsoft Edge (Chromium-based)
Description
Operation on a resource after expiration or release in Microsoft Edge (Chromium-based) allows an unauthorized attacker to disclose information over a network.
CVSS v3.1
Score 6.1medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability, identified as CWE-672, involves performing operations on a resource after it has expired or been released in Microsoft Edge (Chromium-based). This can lead to unauthorized information disclosure over a network. The CVSS 3.1 vector indicates the attack requires network access with high attack complexity, no privileges, and user interaction, but results in a high confidentiality impact without affecting integrity or availability. Microsoft has published an official fix for this issue.
Potential Impact
An attacker can exploit this vulnerability to disclose sensitive information over a network without requiring privileges but with user interaction. The confidentiality impact is high, while integrity and availability are not affected. There are no known exploits in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the provided patch as detailed in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58291 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-06-29T21:59:30.871Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58291","vendor":"Microsoft"}]
Threat ID: 6a48210527e9c79719accc67
Added to database: 07/03/2026, 20:52:21 UTC
Last enriched: 08/10/2026, 13:44:06 UTC
Last updated: 08/16/2026, 03:17:12 UTC
Views: 81
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.