CVE-2026-100821
Site isolation issue in the Panning and Zooming component
CVSS Score
4.7
EPSS Score
0.2%
EPSS Percentile
4th
Site isolation issue in the Panning and Zooming component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
| Vendor | mozilla |
| Product | firefox |
| Ecosystems | |
| Industries | Technology |
| Published | Sep 29, 2026 |
| Last Updated | Oct 1, 2026 |
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Affected Versions
Mozilla / Firefox
All versions affected Mozilla / Thunderbird
All versions affected References
bugzilla.mozilla.org: https://bugzilla.mozilla.org/show_bug.cgi?id=2071784 mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-100/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-101/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-102/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-103/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-97/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-98/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-99/
Credits
Nguyen Thanh Nguyen