This page tracks the Debian fix status. The vulnerability itself is described on the main CVE page. View CVE-2026-74963 →

DEBIAN-CVE-2026-74963

Same-origin policy bypass in the Networking: Cookies component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Th...

Original description

The description as published by the source.

Same-origin policy bypass in the Networking: Cookies component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

Source: OSV.dev (Open Source Vulnerabilities) OSV

Affected packages

Debian:12 firefox-esr

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"140.14.0esr-1~deb12u1"}]}]

Debian:13 firefox-esr

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"140.14.0esr-1~deb13u1"}]}]

Debian:14 firefox-esr

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"140.14.0esr-2"}]}]

Debian:12 thunderbird

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:140.14.0esr-1~deb12u1"}]}]

Debian:13 thunderbird

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:140.14.0esr-1~deb13u1"}]}]

Debian:14 thunderbird

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:140.14.0esr-1"}]}]

References

advisory security-tracker.debian.org