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SOC/SIEM Consultancy

Mitigation bypass in the Networking: HTTP component. This vulnerability affects Firefox < 149 and Firefox ESR < 140.9.
Published:
23 maart 2026 om 23:00:00
Alert date:
24 maart 2026 om 21:04:18
Source:
nvd.nist.gov
Web Technologies
A mitigation bypass vulnerability has been identified in Firefox's Networking: HTTP component. The vulnerability affects Firefox versions prior to 149 and Firefox ESR versions prior to 140.9. This security flaw allows attackers to bypass existing security mitigations in the HTTP networking component. Mozilla has released security advisories addressing this vulnerability. Users should update to the latest versions to remediate this issue.
Technical details
Mitigation steps:
Affected products:
Firefox
Firefox ESR
Related links:
https://nvd.nist.gov/vuln/detail/CVE-2026-4700
https://bugzilla.mozilla.org/show_bug.cgi?id=2003766
https://www.mozilla.org/security/advisories/mfsa2026-20/
https://www.mozilla.org/security/advisories/mfsa2026-22/
Related CVE's:
Related threat actors:
IOC's:
This article was created with the assistance of AI technology by Perceptive.
