Mitigation Bypass in Networking: Cache Component of Firefox Browser
CVE-2026-2791

9.8CRITICAL

Key Information:

Vendor

Mozilla
Status
Firefox
Firefox Esr
Thunderbird
Vendor
CVE Published:
24 February 2026

What is CVE-2026-2791?

A mitigation bypass has been identified in the Networking: Cache component, impacting various versions of the Firefox browser. Specifically, versions prior to 148 and Firefox ESR older than 140.8 are susceptible. This weakness can potentially allow unauthorized access to cached data, thus compromising user security and privacy. Users are advised to apply the latest available updates to safeguard against possible exploitation. For detailed information and remediation steps, refer to Mozilla's security advisories.

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Deploy the Patch

Affected Version(s)

Firefox < 148

Firefox ESR < 140.8

Thunderbird < 148

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2015220
https://www.mozilla.org/security/advisories/mfsa2026-13/
https://www.mozilla.org/security/advisories/mfsa2026-15/

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

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