CVE-2026-119331 Ladybird - Broken Access Control

Ladybird web browser contains a broken access control vulnerability caused by missing enforcement of the stylesheet origin-clean flag in CSSStyleSheet methods, letting malicious pages read and modify cross-origin stylesheets, bypassing Same-Origin Policy.

CVSS base score 7.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.18% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Information Disclosure, Data Tampering
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
Published
30 October 2026
Updated
1 November 2026
Weakness
CWE-200

Vendor fix

Update to the version including commit c0d68bddf3e3616e5173835f0f4c155ee9700d91 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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