Vulnerability record/PUBLISHED/Published Oct 27, 2026 14:05:51 UTC
CVE-2026-117988
Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.
Base score9.6/ 10
SeverityCriticalCVSS 3.1
Exploitability / impact
CVSS metric breakdown
Base severityCritical
Attack vectorNetworkAV
Attack complexityLowAC
Privileges requiredNonePR
User interactionRequiredUI
ScopeChangedS
Confidentiality impactHighC
Integrity impactHighI
Availability impactHighA
CVSS vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:HCVSS communicates standardized severity and impact characteristics. It does not establish whether a system is exploitable in your specific environment.
Record context
CVE Numbering Authoritymozilla
Last updatedNov 5, 2026 16:32:53 UTC
PublishedOct 27, 2026 14:05:51 UTC
ReservedOct 27, 2026 14:05:51 UTC
Credits
- Mozilla