CVE-2026-100807

Name	CVE-2026-100807
Description	Privilege escalation in the DOM: Service Workers component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-4810-1, DLA-4814-1, DSA-6533-1, DSA-6536-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
firefox (PTS)	sid	157.0-1	fixed
firefox-esr (PTS)	bookworm	140.12.0esr-1~deb12u1	vulnerable
	bookworm (security)	153.4.0esr-1~deb12u1	fixed
	trixie	140.15.0esr-1~deb13u1	vulnerable
	trixie (security)	153.4.0esr-1~deb13u1	fixed
	forky	140.16.0esr-1	vulnerable
	sid	153.4.0esr-1	fixed
thunderbird (PTS)	bookworm	1:140.12.0esr-1~deb12u1	vulnerable
	bookworm (security)	1:140.17.0esr-1~deb12u1	fixed
	trixie	1:140.12.0esr-1~deb13u1	vulnerable
	trixie (security)	1:140.17.0esr-1~deb13u1	fixed
	forky	1:140.14.0esr-1	vulnerable
	sid	1:153.4.0esr-1	fixed

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

Package	Type	Release	Fixed Version	Origin
firefox	source	(unstable)	157.0-1
firefox-esr	source	bookworm	153.4.0esr-1~deb12u1	DLA-4814-1
firefox-esr	source	trixie	153.4.0esr-1~deb13u1	DSA-6533-1
firefox-esr	source	(unstable)	153.4.0esr-1
thunderbird	source	bookworm	1:140.17.0esr-1~deb12u1	DLA-4810-1
thunderbird	source	trixie	1:140.17.0esr-1~deb13u1	DSA-6536-1
thunderbird	source	(unstable)	1:153.4.0esr-1

Notes

https://www.mozilla.org/en-US/security/advisories/mfsa2026-97/#CVE-2026-100807
https://www.mozilla.org/en-US/security/advisories/mfsa2026-100/#CVE-2026-100807
https://www.mozilla.org/en-US/security/advisories/mfsa2026-103/#CVE-2026-100807