CVE-2026-6774

unknown

Published 2026-04-21 · Modified 2026-05-27

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CVSS v3

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CVSS v4 NEW

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not yet in upstream

VIR risk

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Description

Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.

Predictions

Exploit likelihood

20%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

Mitigation details

Source: Debian Security Tracker · View original ↗ · DFSG

CVE-2026-6774 NameCVE-2026-6774 DescriptionMitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 150 and Thunderbird 150. SourceCVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, 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…

Workaround

bypass in the DOM: Security component. This vulnerability was fixed in Firefox 150 and Thunderbird 150. SourceCVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, 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 PackageReleaseVersionStatus firefox (PTS)sid151.0.3-1fixed The information below is based on the following data on fixed versions. PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs firefoxsource(unstable)150.0-1 Notes https://www.mozilla.org/en-US/security/advisories/mfsa2026-30/#CVE-2026-6774

CVE-2026-6774

Name	CVE-2026-6774
Description	Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.
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)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
firefox (PTS)	sid	151.0.3-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
firefox	source	(unstable)	150.0-1

Notes

https://www.mozilla.org/en-US/security/advisories/mfsa2026-30/#CVE-2026-6774

Home - Debian Security - Source (Git)

Apply commands

text fix

Notes

https://www.mozilla.org/en-US/security/advisories/mfsa2026-30/#CVE-2026-6774

OS impact

Debian Fixed 1 release

Version	Status	Fixed in
sid	Fixed	`150.0-1`

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.