What is CVE-2026-74968?

CVE-2026-74968 is a medium-severity vulnerability, classified under Origin Validation Error. CVSS score: 5.4/10. Published 2026-08-18.

How severe is CVE-2026-74968?

Medium severity. CVSS v3 base score is 5.4 out of 10.

CVE-2026-74968

CVE-2026-74968

Site isolation issue in the Graphics: WebRender component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.

Weakness classification (CWE)

CWE-346 — Origin Validation Error

References

security@mozilla.org
security@mozilla.org
security@mozilla.org
security@mozilla.org
security@mozilla.org

Frequently asked questions

What is CVE-2026-74968?: CVE-2026-74968 is a medium-severity vulnerability, classified under Origin Validation Error. CVSS score: 5.4/10. Published 2026-08-18.
How severe is CVE-2026-74968?: Medium severity. CVSS v3 base score is 5.4 out of 10.