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6.5 Medium

CVE-2023-23603 Regular expressions used to filter out forbidden properties and values from style directives in calls to `console.log`…

Description

Regular expressions used to filter out forbidden properties and values from style directives in calls to `console.log` weren't accounting for external URLs. Data could then be potentially exfiltrated from the browser. This vulnerability affects Firefox < 109, Firefox ESR < 102.7, and Thunderbird < 102.7.

Affected products and versions

Product Affected versions Fixed in
Firefox 109 earliest → < 109 109
Firefox ESR 102.7 earliest → < 102.7 102.7
Thunderbird 102.7 earliest → < 102.7 102.7

Other CVEs of Firefox

The 2221 CVEs of Firefox →
CVE-2026-120572 Incorrect boundary conditions in the Layout: Block and Inline component 8.8 High CVE-2026-118027 Frame poisoning in the Layout component 9.1 Critical CVE-2026-118025 Other issue in the SVG component 8.8 High CVE-2026-118024 Use-after-free in the Graphics: Text component 8.8 High
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