CVE-2023-23603

Calls to console.log allowed bypassing Content Security Policy via format directive

Published Jun 2, 2023 CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DLA Debian DLA DLA-3275-1 firefox-esr security update
Debian DLA Debian DLA DLA-3324-1 thunderbird security update
Debian DSA Debian DSA DSA-5322-1 firefox-esr security update
Debian DSA Debian DSA DSA-5355-1 thunderbird security update
EUVD EUVD EUVD-2023-27703 Regular expressions used to filter out forbidden properties and values from style directives in calls to <code>console.log</code> weren't accounting for external URLs. Data could then be potentially exfiltrated from the browser. This vulnerability affects Firefox < 109, Thunderbird < 102.7, and Firefox ESR < 102.7.
Ubuntu USN Ubuntu USN USN-5816-1 Firefox vulnerabilities
Ubuntu USN Ubuntu USN USN-5824-1 Thunderbird vulnerabilities
History
Type Values Removed Values Added
Description Regular expressions used to filter out forbidden properties and values from style directives in calls to <code>console.log</code> weren't accounting for external URLs. Data could then be potentially exfiltrated from the browser. This vulnerability affects Firefox < 109, Thunderbird < 102.7, and Firefox ESR < 102.7. 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.
Title Mozilla: Calls to <code>console.log</code> allowed bypasing Content Security Policy via format directive Calls to console.log allowed bypassing Content Security Policy via format directive
Type Values Removed Values Added
Weaknesses CWE-770
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Sources

Status
PUBLISHED
Assigner
mozilla
Published
Updated
Dec 18, 2025, 3:22 PM
Reserved
Jan 16, 2023, 12:00 AM
Status
Modified
Published
Jun 2, 2023, 5:15 PM
Modified
Jun 17, 2026, 5:37 AM
Severity
Low
Public date
Jan 17, 2023, 12:00 AM