CVE-2025-5265

Name	CVE-2025-5265
Description	Due to insufficient escaping of the ampersand character in the “Copy as cURL” feature, an attacker could trick a user into using this command, potentially leading to local code execution on the user's system. This bug only affects Firefox for Windows. Other versions of Firefox are unaffected. This vulnerability affects Firefox < 139, Firefox ESR < 115.24, Firefox ESR < 128.11, Thunderbird < 139, and Thunderbird < 128.11.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
firefox (PTS)	sid	140.0-1	fixed
firefox-esr (PTS)	bullseye	115.14.0esr-1~deb11u1	fixed
	bullseye (security)	128.12.0esr-1~deb11u1	fixed
	bookworm	128.10.0esr-1~deb12u1	fixed
	bookworm (security)	128.12.0esr-1~deb12u1	fixed
	trixie	128.11.0esr-1	fixed
	sid	128.12.0esr-1	fixed
thunderbird (PTS)	bullseye	1:115.12.0-1~deb11u1	fixed
	bullseye (security)	1:128.11.0esr-1~deb11u1	fixed
	bookworm	1:128.10.0esr-1~deb12u1	fixed
	bookworm (security)	1:128.11.0esr-1~deb12u1	fixed
	trixie, sid	1:128.11.0esr-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version
firefox	source	(unstable)	(not affected)
firefox-esr	source	(unstable)	(not affected)
thunderbird	source	(unstable)	(not affected)

Notes

- firefox <not-affected> (Only affects Firefox on Windows)
- firefox-esr <not-affected> (Only affects Firefox ESR on Windows)
- thunderbird <not-affected> (Only affects Thunderbird on Windows)
https://www.mozilla.org/en-US/security/advisories/mfsa2025-42/#CVE-2025-5265
https://www.mozilla.org/en-US/security/advisories/mfsa2025-44/#CVE-2025-5265
https://www.mozilla.org/en-US/security/advisories/mfsa2025-46/#CVE-2025-5265