CVE-2026-16365: Vulnerability in Mozilla Firefox
Privilege escalation in the DOM: Workers component. This vulnerability was fixed in Firefox 153.
AI Analysis
Technical Summary
CVE-2026-16365 is a privilege escalation vulnerability affecting the DOM: Workers component in Mozilla Firefox. It was publicly disclosed and fixed in Firefox 153. The Mozilla advisory categorizes this vulnerability as high impact and includes it among multiple security fixes released in Firefox 153. No CVSS score is provided, but the vendor's impact rating indicates a serious security concern. The vulnerability allows an attacker to escalate privileges within the browser environment, potentially compromising security boundaries enforced by the DOM Workers component.
Potential Impact
The vulnerability enables privilege escalation in the Firefox DOM: Workers component, which could allow an attacker to gain higher privileges than intended within the browser. This could lead to unauthorized actions or access to sensitive browser internals. The vendor rates the impact as high, indicating significant security implications if exploited.
Mitigation Recommendations
This vulnerability is fixed in Firefox version 153. Users and administrators should update to Firefox 153 or later to remediate this issue. No additional mitigation steps are indicated by the vendor advisory.
CVE-2026-16365: Vulnerability in Mozilla Firefox
Description
Privilege escalation in the DOM: Workers component. This vulnerability was fixed in Firefox 153.
Affected software
Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-16365 is a privilege escalation vulnerability affecting the DOM: Workers component in Mozilla Firefox. It was publicly disclosed and fixed in Firefox 153. The Mozilla advisory categorizes this vulnerability as high impact and includes it among multiple security fixes released in Firefox 153. No CVSS score is provided, but the vendor's impact rating indicates a serious security concern. The vulnerability allows an attacker to escalate privileges within the browser environment, potentially compromising security boundaries enforced by the DOM Workers component.
Potential Impact
The vulnerability enables privilege escalation in the Firefox DOM: Workers component, which could allow an attacker to gain higher privileges than intended within the browser. This could lead to unauthorized actions or access to sensitive browser internals. The vendor rates the impact as high, indicating significant security implications if exploited.
Mitigation Recommendations
This vulnerability is fixed in Firefox version 153. Users and administrators should update to Firefox 153 or later to remediate this issue. No additional mitigation steps are indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-07-20T21:56:17.096Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://www.mozilla.org/security/advisories/mfsa2026-68/","vendor":"Mozilla"}]
Threat ID: 6a5f6cbb2a4a8d5989262516
Added to database: 07/21/2026, 12:57:31 UTC
Last enriched: 07/21/2026, 13:42:11 UTC
Last updated: 07/21/2026, 22:51:54 UTC
Views: 6
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.