Dashboard / CVE-2026-119331

CVE-2026-119331

HIGH
MEDIUM Priority: 0.01 BB Relevance: 64/100
Published: 2026-10-30 Modified: 2026-10-30 First seen: 2026-10-30 Status: active

Attack Surface

Network Low Complexity No Auth Conf. Impact

CVSS Vector Breakdown

AV: Network
AC: Low
PR: None
UI: Required
S: Unchanged
C: High
I: Low
A: None

Description

Ladybird is a truly independent web browser. Prior to the c0d68bddf3e3616e5173835f0f4c155ee9700d91 commit, CSSStyleSheet.cssRules, insertRule(), and deleteRule() in Libraries/LibWeb/CSS/CSSStyleSheet.cpp did not enforce the stylesheet origin-clean flag with the required SecurityError, even though cross-origin imported stylesheets were correctly marked non-origin-clean. A malicious page could read parsed rules from a stylesheet loaded without CORS and could insert or delete rules in the victim stylesheet, bypassing the Same-Origin Policy. Reading could expose selectors, generated content, feature markers, or other sensitive rule text, while mutation could alter page visibility or layout. The issue does not provide memory corruption, code execution, or persistence after the attacker page closes. This vulnerability is fixed by commit c0d68bddf3e3616e5173835f0f4c155ee9700d91.

Weakness Classification (2)

Affected Software (2)

VendorProductVersion
LadybirdBrowser ladybird < c0d68bddf3e3616e5173835f0f4c155ee9700d91
LadybirdBrowser ladybird < c0d68bddf3e3616e5173835f0f4c155ee9700d91

References & Advisories (2)

Bug Bounty Relevance

64 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity

CVSS Score

7.1 / 10.0 v3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N

EPSS — Exploitation Probability

0.18%
Raw Score 0.001830
Percentile 7.9%
Date 2026-10-31

Intelligence Sources

mitre ref →
nvd ref →

External Links