CVE-2026-74934
HIGHCVSS 7.5/10EPSS 0.17%
Last modified
CVE-2026-74934 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Site isolation issue in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.. EPSS estimates a 0.17% chance of exploitation in the next 30 days.
Description
Site isolation issue in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 115.39.0 |
| Mozilla | Firefox | >= 116.0, < 140.14.0 |
| Mozilla | Firefox | >= 141.0, < 153.1.0 |
| Mozilla | Thunderbird | < 140.14.0 |
| Mozilla | Thunderbird | >= 141.0, < 153.1.0 |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2050584Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2026-74/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-75/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-76/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-77/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-78/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-79/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-80/Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-74934?
Site isolation issue in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
How severe is CVE-2026-74934?
CVE-2026-74934 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.17% probability of exploitation in the next 30 days.
How do I fix CVE-2026-74934?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- Uncovering a hidden BOLA in Appsmith's snapshot logicStrix autonomously discovered a BOLA/IDOR vulnerability in Appsmith's snapshot deletion path.
- Same Subject, Wrong User: A Cross-Issuer Account Takeover in n8nStrix found an identity-binding bug in n8n's token-exchange flow enabling account takeover.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-74928The Project Manager WordPress plugin before 4.0.7 does not …7.5
- CVE-2026-74929The Project Manager WordPress plugin before 4.0.7 does not …5.4
- CVE-2026-7493The Appointment Booking Calendar — Simply Schedule Appointme…5.3
- CVE-2026-74930The Project Manager WordPress plugin before 4.0.7 does not …4.3
- CVE-2026-74932The WP Fastest Cache WordPress plugin before 1.5.1 does not …7.5
- CVE-2026-74933The GenieWords WordPress plugin from 1.5.27 to 1.5.34 does n…8.8
- CVE-2026-74935Privilege escalation in the DOM: Networking component. This …8.8
- CVE-2026-74936Use-after-free in the JavaScript: WebAssembly component. Thi…9.8
- CVE-2026-74937Use-after-free in the JavaScript: GC component. This vulnera…8.8
- CVE-2026-74938Mitigation bypass in the JavaScript: GC component. This vuln…9.1
- CVE-2026-74939Privilege escalation in the DOM: Navigation component. This …8.8
- CVE-2026-7494Nexus Repository 3 is vulnerable to Server-Side Request Forg…5
Are you affected by CVE-2026-74934?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST