CVE-2026-74941: Vulnerability in Mozilla Firefox
Privilege escalation in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
AI Analysis
Technical Summary
CVE-2026-74941 is a high-impact privilege escalation vulnerability affecting the Graphics: CanvasWebGL component in Mozilla Firefox. The flaw allows an attacker to escalate privileges within the browser environment. Mozilla fixed this vulnerability in Firefox 154, Firefox ESR 140.14, and Firefox ESR 153.1 as part of a broader security update addressing multiple vulnerabilities. The vendor advisory confirms the fix and reports no active exploitation in the wild.
Potential Impact
Successful exploitation of this vulnerability could allow an attacker to escalate privileges within the Firefox browser, potentially leading to unauthorized actions or access within the browser context. The impact is rated high by Mozilla. However, there are no reports of active exploitation in the wild at this time.
Mitigation Recommendations
Mozilla has released official fixes for this vulnerability in Firefox 154, Firefox ESR 140.14, and Firefox ESR 153.1. Users and administrators should update to these versions or later to remediate the issue. No additional mitigation actions are required beyond applying the official updates.
CVE-2026-74941: Vulnerability in Mozilla Firefox
Description
Privilege escalation in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
CVSS v3.1
Score 8.8high
Affected software
pkg:github/mozilla/firefox-esrRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-74941 is a high-impact privilege escalation vulnerability affecting the Graphics: CanvasWebGL component in Mozilla Firefox. The flaw allows an attacker to escalate privileges within the browser environment. Mozilla fixed this vulnerability in Firefox 154, Firefox ESR 140.14, and Firefox ESR 153.1 as part of a broader security update addressing multiple vulnerabilities. The vendor advisory confirms the fix and reports no active exploitation in the wild.
Potential Impact
Successful exploitation of this vulnerability could allow an attacker to escalate privileges within the Firefox browser, potentially leading to unauthorized actions or access within the browser context. The impact is rated high by Mozilla. However, there are no reports of active exploitation in the wild at this time.
Mitigation Recommendations
Mozilla has released official fixes for this vulnerability in Firefox 154, Firefox ESR 140.14, and Firefox ESR 153.1. Users and administrators should update to these versions or later to remediate the issue. No additional mitigation actions are required beyond applying the official updates.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-08-17T11:57:39.938Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://www.mozilla.org/security/advisories/mfsa2026-74/","vendor":"Mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-76/","vendor":"Mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-77/","vendor":"Mozilla"}]
Threat ID: 6a845502c6e8be03323673a5
Added to database: 08/18/2026, 12:50:10 UTC
Last enriched: 08/18/2026, 13:57:02 UTC
Last updated: 08/18/2026, 23:12:26 UTC
Views: 5
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