CVE-2026-8962

8.1 HIGH

Mitigation bypass in the DOM: Security component

Published: 2026-05-19 · Last updated: 2026-05-20

Severity and scoring

CVSS: 8.1 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
CWE: CWE-693

Affected products

Vendor	Product
mozilla	firefox, thunderbird

Description

Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

Source: NVD

References

[NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-8962
[Other]https://bugzilla.mozilla.org/show_bug.cgi?id=2004804
[Vendor advisory]https://www.mozilla.org/security/advisories/mfsa2026-46/
[Vendor advisory]https://www.mozilla.org/security/advisories/mfsa2026-48/
[Vendor advisory]https://www.mozilla.org/security/advisories/mfsa2026-50/
[Vendor advisory]https://www.mozilla.org/security/advisories/mfsa2026-51/

Related CVEs

Same vendor

CVE-2026-12330 — Incorrect boundary conditions in the Internationalization component (5.4 MEDIUM)
CVE-2026-12329 — Memory safety bug fixed in Thunderbird ESR 140.12 (5.3 MEDIUM)
CVE-2026-12328 — Memory safety bugs present in Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151 and Thunderbird 151 (8.1 HIGH)
CVE-2026-12323 — Spoofing issue in the DOM: Core & HTML component (5.4 MEDIUM)
CVE-2026-12322 — Clickjacking issue in the Widget: Gtk component (5.4 MEDIUM)

Same CWE

CVE-2026-53853 — OpenClaw before 2026.5.12 contains an argument pattern validation bypass in the exec allowlist that allows attackers to execute disallowe... (8.3 HIGH)
CVE-2026-53845 — OpenClaw before 2026.5.6 contains a hook bypass vulnerability where skill commands routed through the affected dispatch path skip before-... (4.3 MEDIUM)
CVE-2026-12316 — Mitigation bypass in the DOM: Security component (9.1 CRITICAL)
CVE-2026-12315 — Mitigation bypass in the DOM: Security component (9.1 CRITICAL)
CVE-2026-12302 — Mitigation bypass in the DOM: Security component (6.5 MEDIUM)