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No exploitation reportedFix available

CVE-2026-124951

Privilege escalation in the Nimbus Desktop Client component

No exploitation reported by the sources we read.

  • Published2026-11-10
  • WeaknessCWE-269

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2026-11-1013:28CVE publishedCNA

Versions per branch

Products declared by the CNA2 products

As mozilla, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Mozilla Firefox

    Not affected ≥ 153.7, ≤ 153.* · ≥ 160

  • Mozilla Thunderbird

    Not affected ≥ 153.7, ≤ 153.* · ≥ 160

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-11-10

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • firefoxRocky Linux:9all versions · fixed in 0:153.7.0-1.el9_9and 3 other packages
  • firefoxRocky Linux:8all versions · fixed in 0:153.7.0-1.el8_10and 2 other packages
  • firefoxRed Hat:rhel_eus:9.8::appstreamall versions · fixed in 0:153.7.0-1.el9_8and 3 other packages
  • firefoxRed Hat:enterprise_linux:10.3all versions · fixed in 0:153.7.0-1.el10_3and 2 other packages
  • firefoxRed Hat:enterprise_linux:9::appstreamall versions · fixed in 0:153.7.0-1.el9_9and 3 other packages
  • firefoxRed Hat:enterprise_linux:8::appstreamall versions · fixed in 0:153.7.0-1.el8_10and 2 other packages
  • firefoxRed Hat:enterprise_linux_eus:10.2all versions · fixed in 0:153.7.0-1.el10_2and 2 other packages
  • firefoxAlmaLinux:8all versions · fixed in 153.7.0-1.el8_10

23 more package ranges on OSV.dev

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
2026-11-10
Last Modified
2026-11-13
NVD status
Deferred
GitHub Advisory
GHSA-qw39-vxq2-qq75

Frequently asked questions

What is CVE-2026-124951?

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.

Is CVE-2026-124951 actively exploited?

Active exploitation of CVE-2026-124951 has not been confirmed. Its EPSS score was 0.2% on 2026-11-12, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-124951?

CVE-2026-124951 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

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