CVE-2026-74941: Vulnerability in Mozilla Firefox
CVE-2026-74941 is a high severity privilege escalation vulnerability in the Graphics: CanvasWebGL component of Mozilla Firefox. It was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1. The vulnerability allows an attacker to escalate privileges within the affected component. Mozilla has released official fixes for this issue as part of their security advisories announced on August 18, 2026.
AI Analysis
Technical Summary
CVE-2026-74941 is a privilege escalation vulnerability located in the Graphics: CanvasWebGL component of Mozilla Firefox. This vulnerability was identified and fixed in Firefox 154 and corresponding ESR and Thunderbird versions. The CVSS v3.1 score is 8.8, indicating high severity, with attack vector network, low attack complexity, no privileges required, user interaction required, and impacts to confidentiality, integrity, and availability. The vendor advisory confirms the vulnerability and the availability of patches in Firefox 154 and ESR 140.14 and 153.1. Multiple related vulnerabilities were fixed simultaneously in these releases.
Potential Impact
Successful exploitation of this vulnerability could allow an attacker to escalate privileges within the Firefox process, potentially leading to unauthorized access or control over affected components. The CVSS score of 8.8 reflects a high impact on confidentiality, integrity, and availability. However, there are no known exploits in the wild at this time.
Mitigation Recommendations
Mozilla has released official fixes for this vulnerability in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1. Users and administrators should update to these versions or later to remediate the vulnerability. No additional mitigation actions are required beyond applying the official patches.
CVE-2026-74941: Vulnerability in Mozilla Firefox
Description
CVE-2026-74941 is a high severity privilege escalation vulnerability in the Graphics: CanvasWebGL component of Mozilla Firefox. It was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1. The vulnerability allows an attacker to escalate privileges within the affected component. Mozilla has released official fixes for this issue as part of their security advisories announced on August 18, 2026.
CVSS v3.1
Score 8.8high
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.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-74941 is a privilege escalation vulnerability located in the Graphics: CanvasWebGL component of Mozilla Firefox. This vulnerability was identified and fixed in Firefox 154 and corresponding ESR and Thunderbird versions. The CVSS v3.1 score is 8.8, indicating high severity, with attack vector network, low attack complexity, no privileges required, user interaction required, and impacts to confidentiality, integrity, and availability. The vendor advisory confirms the vulnerability and the availability of patches in Firefox 154 and ESR 140.14 and 153.1. Multiple related vulnerabilities were fixed simultaneously in these releases.
Potential Impact
Successful exploitation of this vulnerability could allow an attacker to escalate privileges within the Firefox process, potentially leading to unauthorized access or control over affected components. The CVSS score of 8.8 reflects a high impact on confidentiality, integrity, and availability. However, there are no known exploits in the wild at this time.
Mitigation Recommendations
Mozilla has released official fixes for this vulnerability in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1. Users and administrators should update to these versions or later to remediate the vulnerability. No additional mitigation actions are required beyond applying the official patches.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-08-17T11:57:39.938Z
- State
- PUBLISHED
- 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: 09/11/2026, 22:03:43 UTC
Last updated: 10/02/2026, 09:56:52 UTC
Views: 50
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