Disclosed
CVE-2026-8957
Privilege escalation in the Enterprise Policies component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
Exploitation Probability (EPSS)
Low Priority0.04%
The Exploit Prediction Scoring System (EPSS) uses machine learning to estimate the probability that a vulnerability will be exploited in the wild within the next 30 days.
0% (Theoretical)100% (Certainty)
7-Day Exploitation Trend
Vulnerability Timeline
2 eventsMay 19, 2026
Vulnerability Disclosed
Published to component-level vulnerability database.
May 20, 2026
Last Updated
Record updated with new analysis or tags.
Threat Actor Attribution
PREMIUM INTELAssociated Groups:Lazarus Group, APT28
Ransomware Campaigns:LockBit 3.0, BlackCat
IoCs (Indicators):14 IPs, 3 Hashes
Remediation & Mitigation
SOLUTIONOfficial patches and mitigation steps are available for this vulnerability.
# Update Command
apt-get update && apt-get upgrade -y specific-package
# Verify installation
dpkg -l | grep package-name
apt-get update && apt-get upgrade -y specific-package
# Verify installation
dpkg -l | grep package-name
Affected Products
2 Total
mozilla/firefoxAll Versions
mozilla/thunderbirdAll Versions
References
https://bugzilla.mozilla.org/show_bug.cgi?id=2033850Mozilla
Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-46/Mozilla
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-48/Mozilla
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-50/Mozilla
Vendor Advisory
Am I Vulnerable?
Check your domain or package.json for CVE-2026-8957 exposure.
Vulnerability Details
CVSS Base Score
8.8/ 10
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published Date
May 19, 2026
Last Modified
May 20, 2026
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