CVE-2026-12289

8.8 HIGH

Privilege escalation in the Graphics: WebRender component

Published: 2026-06-16 · Last updated: 2026-06-16

Severity and scoring

CVSS: 8.8 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE: CWE-269

Affected products

Vendor	Product
mozilla	firefox, thunderbird

Description

Privilege escalation in the Graphics: WebRender component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.

Source: NVD

References

[NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-12289
[Other]https://bugzilla.mozilla.org/show_bug.cgi?id=2023443
[Vendor advisory]https://www.mozilla.org/security/advisories/mfsa2026-57/
[Vendor advisory]https://www.mozilla.org/security/advisories/mfsa2026-58/
[Vendor advisory]https://www.mozilla.org/security/advisories/mfsa2026-59/
[Vendor advisory]https://www.mozilla.org/security/advisories/mfsa2026-60/
[Vendor advisory]https://www.mozilla.org/security/advisories/mfsa2026-61/

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)

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