CVE-2026-100821

MEDIO 4.7CVE-2026-100821 · Published 29/09/2026 · updated 13/10/2026

En resumen

CVE-2026-100821 es una vulnerabilidad MEDIO (CVSS 4.7) que afecta a firefox (mozilla), thunderbird (mozilla).
Probabilidad de explotación en los próximos 30 días (EPSS): 0.14%, mayor que el 3.6% de las vulnerabilidades.
Solución: actualizar a 140.17.0, 153.4.0, 157.0.0, 115.42.0 o posterior.

Package	Affected versions	Patched versions
firefox mozilla	`≥ 116.0.0, < 140.17.0≥ 141.0.0, < 153.4.0≥ 154.0.0, < 157.0.0< 115.42.0`	`140.17.0153.4.0157.0.0115.42.0`
thunderbird mozilla	`≥ 141.0, < 153.4.0≥ 154.0, < 157.0< 140.17.0`	`153.4.0157.0140.17.0`

Description

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.

References

bugzilla.mozilla.org/show_bug.cgi · Permissions Required
mozilla.org/security/advisories/mfsa2026-100 · Vendor Advisory
mozilla.org/security/advisories/mfsa2026-101 · Vendor Advisory
mozilla.org/security/advisories/mfsa2026-102 · Vendor Advisory
mozilla.org/security/advisories/mfsa2026-103 · Vendor Advisory
mozilla.org/security/advisories/mfsa2026-97 · Vendor Advisory
mozilla.org/security/advisories/mfsa2026-98 · Vendor Advisory
mozilla.org/security/advisories/mfsa2026-99 · Vendor Advisory

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Package

Affected versions

Patched versions

firefox

mozilla

≥ 116.0.0, < 140.17.0≥ 141.0.0, < 153.4.0≥ 154.0.0, < 157.0.0< 115.42.0

140.17.0153.4.0157.0.0115.42.0

thunderbird

mozilla

≥ 141.0, < 153.4.0≥ 154.0, < 157.0< 140.17.0

153.4.0157.0140.17.0

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