CVE-2026-109772 | BDVDB-2026-388642 Detail

MozillaFirefox

Description#

Same-origin policy bypass in the DevTools component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.

Per CVSS v3.1: confidentiality impact high, integrity impact high, availability impact none. Attack vector: network.

No public exploit known

9.1 Critical

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 7.7.

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Not classified

No specific action is recorded in the source data. Check the references for vendor guidance.

Not available

9.1 Critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Not available

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).