CVE-2026-100828 Affecting thunderbird package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-ECHOLATEST-THUNDERBIRD-20361241
- published1 Oct 2026
- disclosed29 Sept 2026
Introduced: 29 Sep 2026
NewCVE-2026-100828 (opens in a new tab)How to fix?
There is no fixed version for Echo:latest thunderbird.
NVD Description
Note: Versions mentioned in the description apply only to the upstream thunderbird package and not the thunderbird package as distributed by Echo.
See How to fix? for Echo:latest relevant fixed versions and status.
Mitigation bypass in the Bookmarks & History component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.
References
- https://advisory.echohq.com/cve/CVE-2026-100828
- https://bugzilla.mozilla.org/show_bug.cgi?id=2066019
- https://www.mozilla.org/security/advisories/mfsa2026-100/
- https://www.mozilla.org/security/advisories/mfsa2026-101/
- https://www.mozilla.org/security/advisories/mfsa2026-103/
- https://www.mozilla.org/security/advisories/mfsa2026-97/