CVE-2026-100817: Vulnerability in Mozilla Firefox
Other issue in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 157.
AI Analysis
Technical Summary
This vulnerability concerns a defect in the JavaScript: WebAssembly component of Mozilla Firefox that could lead to significant security issues. Mozilla fixed this vulnerability in Firefox 157 as part of a security advisory (MFSA 2026-97) that addressed numerous high-impact bugs. The advisory does not provide detailed technical specifics about the nature of the flaw but confirms its resolution in the stated version. No active exploitation in the wild has been reported.
Potential Impact
The vulnerability is rated as having high impact by Mozilla, indicating potential serious security consequences if exploited. However, specific impact details such as privilege escalation, information disclosure, or denial of service are not explicitly described in the advisory for this particular CVE. The fix in Firefox 157 mitigates these risks.
Mitigation Recommendations
Users and administrators should update to Firefox version 157 or later to remediate this vulnerability. Mozilla has officially fixed this issue in Firefox 157. No additional mitigation steps are required beyond applying this update.
CVE-2026-100817: Vulnerability in Mozilla Firefox
Description
Other issue in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 157.
Affected software
Mozilla
Firefox
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
This vulnerability concerns a defect in the JavaScript: WebAssembly component of Mozilla Firefox that could lead to significant security issues. Mozilla fixed this vulnerability in Firefox 157 as part of a security advisory (MFSA 2026-97) that addressed numerous high-impact bugs. The advisory does not provide detailed technical specifics about the nature of the flaw but confirms its resolution in the stated version. No active exploitation in the wild has been reported.
Potential Impact
The vulnerability is rated as having high impact by Mozilla, indicating potential serious security consequences if exploited. However, specific impact details such as privilege escalation, information disclosure, or denial of service are not explicitly described in the advisory for this particular CVE. The fix in Firefox 157 mitigates these risks.
Mitigation Recommendations
Users and administrators should update to Firefox version 157 or later to remediate this vulnerability. Mozilla has officially fixed this issue in Firefox 157. No additional mitigation steps are required beyond applying this update.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-09-26T19:18:26.116Z
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://www.mozilla.org/security/advisories/mfsa2026-97/","vendor":"Mozilla"}]
Threat ID: 6abbb3f7f7a7c541066409bd
Added to database: 09/29/2026, 12:49:59 UTC
Last enriched: 09/29/2026, 13:03:35 UTC
Last updated: 09/29/2026, 18:20:13 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.