Riskcovery

CVE-2026-4700

Mitigation bypass in the Networking: HTTP component

State
Published
Severity
9.8 Critical
Published
Mar 24, 2026
Updated
Jul 15, 2026
Reserved
Mar 23, 2026

Read the record on cve.org

Description

Mitigation bypass in the Networking: HTTP component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

Scores

CVSSScoreVectorSource
3.19.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HCISA-ADP
3.17.5 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:Hredhat-SADP

Weaknesses

  • CWE-288 Authentication Bypass Using an Alternate Path or Channel
  • CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

Affected Products

ProductVersions
FirefoxMozilla
  • 140.9 through 140.*Not affected
  • 149 and laterNot affected
ThunderbirdMozilla
  • 140.9 through 140.*Not affected
  • 149 and laterNot affected

References

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