CVE-2026-92023: Vulnerability in Mozilla Firefox
Use-after-free in the XML component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 140.16.
AI Analysis
Technical Summary
This vulnerability involves a use-after-free condition in the XML component of Mozilla Firefox. Use-after-free vulnerabilities occur when a program continues to use a pointer after the memory it points to has been freed, potentially leading to memory corruption and security issues. Mozilla has fixed this issue in Firefox 156 and the specified ESR versions. The vendor advisory classifies the impact as high and provides multiple related advisories for Firefox and Firefox ESR releases.
Potential Impact
The use-after-free vulnerability in the XML component could allow an attacker to cause memory corruption, potentially leading to arbitrary code execution or a crash. The vendor rates the impact as high, indicating a serious security risk if exploited. However, there are no reports of active exploitation in the wild.
Mitigation Recommendations
Mozilla has released official fixes for this vulnerability in Firefox 156 and Firefox ESR versions 115.41, 140.16, and 153.3. Users and administrators should update to these versions or later to mitigate the risk. Since the vulnerability is patched, no additional mitigation steps are required beyond applying the official updates.
CVE-2026-92023: Vulnerability in Mozilla Firefox
Description
Use-after-free in the XML component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 140.16.
Affected software
Mozilla
Firefox
Mozilla
Thunderbird
pkg:github/mozilla/firefox-esrRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves a use-after-free condition in the XML component of Mozilla Firefox. Use-after-free vulnerabilities occur when a program continues to use a pointer after the memory it points to has been freed, potentially leading to memory corruption and security issues. Mozilla has fixed this issue in Firefox 156 and the specified ESR versions. The vendor advisory classifies the impact as high and provides multiple related advisories for Firefox and Firefox ESR releases.
Potential Impact
The use-after-free vulnerability in the XML component could allow an attacker to cause memory corruption, potentially leading to arbitrary code execution or a crash. The vendor rates the impact as high, indicating a serious security risk if exploited. However, there are no reports of active exploitation in the wild.
Mitigation Recommendations
Mozilla has released official fixes for this vulnerability in Firefox 156 and Firefox ESR versions 115.41, 140.16, and 153.3. Users and administrators should update to these versions or later to mitigate the risk. Since the vulnerability is patched, no additional mitigation steps are required beyond applying the official updates.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-09-15T12:33:43.103Z
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://www.mozilla.org/security/advisories/mfsa2026-90/","vendor":"Mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-91/","vendor":"Mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-92/","vendor":"Mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-93/","vendor":"Mozilla"}]
Threat ID: 6aa93e6055bf5e2cf5d30fe1
Added to database: 09/15/2026, 12:47:28 UTC
Last enriched: 09/15/2026, 13:32:13 UTC
Last updated: 09/15/2026, 22:11:30 UTC
Views: 4
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