CVE-2026-124951Improper Privilege Management
NVDCVSS scored by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Vulnerability Summary
Privilege escalation in the Nimbus Desktop Client component. This vulnerability was fixed in Firefox 160, Firefox ESR 153.7, Thunderbird 160, and Thunderbird 153.7.
CVSS v3.1 Base Metrics — Score 8.8 (HIGH)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HAttack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionRequired
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
Affected & Patched Versions
Not provided by NVD for this CVE.
No patched version published yet
Until a fix ships, reduce exposure:
- Restrict access to the affected service or interface to trusted networks.
- Disable the affected feature if you do not need it.
- Watch the vendor advisory for a firmware or software update.
What to do
Plan remediation soon. No exploitation is confirmed yet, but the severity is high.
- Check whether you run the affected product and which version.
- No patched version is listed yet. Limit access to the affected service to trusted networks, and disable the feature if you can.
- Subscribe to the vendor advisory so you learn when a fix ships.
Timeline
- Nov 10, 2026Published
- Nov 13, 2026Record last modified
- Nov 13, 2026CVSS score changed: 0.0 to 8.8
- Nov 13, 2026Severity changed to HIGH
Score, severity and exploitation changes are tracked from the day Watchtower started logging them.
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Set up CVE alertsExternal References
- Issue Trackinghttps://bugzilla.mozilla.org/show_bug.cgi?id=2085124
- Vendor Advisoryhttps://www.mozilla.org/security/advisories/mfsa2026-125/
- Vendor Advisoryhttps://www.mozilla.org/security/advisories/mfsa2026-127/
- Vendor Advisoryhttps://www.mozilla.org/security/advisories/mfsa2026-128/
- Vendor Advisoryhttps://www.mozilla.org/security/advisories/mfsa2026-129/
Data last checked: Nov 14, 2026 02:13 UTC