CVE-2026-16379: Vulnerability in Mozilla Firefox
Privilege escalation in the DOM: Content Processes component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
AI Analysis
Technical Summary
This vulnerability involves privilege escalation within the DOM: Content Processes component of Mozilla Firefox. It allows an attacker to gain elevated privileges, potentially impacting the confidentiality, integrity, and availability of the affected system. The issue affects Firefox versions prior to 153 and Firefox ESR versions prior to 140.13. Mozilla has addressed this vulnerability in Firefox 153 and Firefox ESR 140.13 as part of a broader security update fixing multiple high-impact vulnerabilities.
Potential Impact
Successful exploitation of this vulnerability could allow an attacker to escalate privileges within the Firefox content process, potentially leading to unauthorized access or control over browser functions and user data. The CVSS score of 8.8 reflects high impact on confidentiality, integrity, and availability. However, there are no reports of active exploitation in the wild at this time.
Mitigation Recommendations
A security update fixing this vulnerability is available in Firefox 153 and Firefox ESR 140.13. Users and administrators should apply these updates promptly to remediate the issue. No additional mitigation steps are indicated by the vendor advisory.
CVE-2026-16379: Vulnerability in Mozilla Firefox
Description
Privilege escalation in the DOM: Content Processes component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
CVSS v3.1
Score 8.8high
Affected software
pkg:github/mozilla/firefox-esrRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves privilege escalation within the DOM: Content Processes component of Mozilla Firefox. It allows an attacker to gain elevated privileges, potentially impacting the confidentiality, integrity, and availability of the affected system. The issue affects Firefox versions prior to 153 and Firefox ESR versions prior to 140.13. Mozilla has addressed this vulnerability in Firefox 153 and Firefox ESR 140.13 as part of a broader security update fixing multiple high-impact vulnerabilities.
Potential Impact
Successful exploitation of this vulnerability could allow an attacker to escalate privileges within the Firefox content process, potentially leading to unauthorized access or control over browser functions and user data. The CVSS score of 8.8 reflects high impact on confidentiality, integrity, and availability. However, there are no reports of active exploitation in the wild at this time.
Mitigation Recommendations
A security update fixing this vulnerability is available in Firefox 153 and Firefox ESR 140.13. Users and administrators should apply these updates promptly to remediate the issue. No additional mitigation steps are indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-07-20T21:56:46.680Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://www.mozilla.org/security/advisories/mfsa2026-68/","vendor":"Mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-70/","vendor":"Mozilla"}]
Threat ID: 6a5f6cbe2a4a8d59892625e2
Added to database: 07/21/2026, 12:57:34 UTC
Last enriched: 07/30/2026, 02:11:17 UTC
Last updated: 09/03/2026, 22:52:09 UTC
Views: 103
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.