CVE-2026-16409: Vulnerability in Mozilla Firefox
CVE-2026-16409 is a high-severity vulnerability in Mozilla Firefox involving an invalid pointer in the Security: PSM component. This flaw was addressed and fixed in Firefox version 153. The vulnerability has a CVSS score of 7.5, indicating a significant impact on availability but no direct impact on confidentiality or integrity. Exploits are not known to be in the wild. The issue is part of a broader set of security fixes released in Firefox 153 and Thunderbird 153.
AI Analysis
Technical Summary
CVE-2026-16409 describes an invalid pointer vulnerability in the Security: PSM component of Mozilla Firefox. This vulnerability could lead to a denial-of-service condition (availability impact) without affecting confidentiality or integrity. Mozilla fixed this issue in Firefox 153 as part of a security advisory that addressed multiple high-impact vulnerabilities. The CVSS vector indicates the vulnerability is remotely exploitable without privileges or user interaction. No known exploits have been reported in the wild.
Potential Impact
The vulnerability impacts availability by potentially causing crashes or denial-of-service conditions in Firefox versions prior to 153. There is no reported impact on confidentiality or integrity. No known active exploitation has been observed.
Mitigation Recommendations
Mozilla has released an official fix for this vulnerability in Firefox 153. Users and administrators should update affected Firefox installations to version 153 or later to remediate this issue. Since this is not a cloud service, manual patching is required. No additional mitigation steps are indicated by the vendor advisory.
CVE-2026-16409: Vulnerability in Mozilla Firefox
Description
CVE-2026-16409 is a high-severity vulnerability in Mozilla Firefox involving an invalid pointer in the Security: PSM component. This flaw was addressed and fixed in Firefox version 153. The vulnerability has a CVSS score of 7.5, indicating a significant impact on availability but no direct impact on confidentiality or integrity. Exploits are not known to be in the wild. The issue is part of a broader set of security fixes released in Firefox 153 and Thunderbird 153.
CVSS v3.1
Score 7.5high
Affected software
Run 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
CVE-2026-16409 describes an invalid pointer vulnerability in the Security: PSM component of Mozilla Firefox. This vulnerability could lead to a denial-of-service condition (availability impact) without affecting confidentiality or integrity. Mozilla fixed this issue in Firefox 153 as part of a security advisory that addressed multiple high-impact vulnerabilities. The CVSS vector indicates the vulnerability is remotely exploitable without privileges or user interaction. No known exploits have been reported in the wild.
Potential Impact
The vulnerability impacts availability by potentially causing crashes or denial-of-service conditions in Firefox versions prior to 153. There is no reported impact on confidentiality or integrity. No known active exploitation has been observed.
Mitigation Recommendations
Mozilla has released an official fix for this vulnerability in Firefox 153. Users and administrators should update affected Firefox installations to version 153 or later to remediate this issue. Since this is not a cloud service, manual patching is required. No additional mitigation steps are indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-07-20T21:57:50.095Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://www.mozilla.org/security/advisories/mfsa2026-68/","vendor":"Mozilla"}]
Threat ID: 6a5f6cc42a4a8d5989262a08
Added to database: 07/21/2026, 12:57:40 UTC
Last enriched: 07/30/2026, 04:49:16 UTC
Last updated: 08/30/2026, 10:52:07 UTC
Views: 60
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.