CVE-2026-109739
Privilege escalation in the WebExtensions component
- Risk score
- 59/100
- CVSS
- 8.8 v3.1
- Exploit chance (30 days)
- 0.4%
- Published
- 13 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- Privilege escalation in the WebExtensions component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.
- Affected
- See advisory
- Fix
- Apply the vendor's security update; see the linked advisory.
- Exploitation
- No known exploitation
Why it is Yellow
- CVSS 8.8 high
References
Original description
Privilege escalation in the WebExtensions component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.
Last activity 13 Oct 2026. Patch Forecast updates every hour.