CVE-2023-23603 Calls to console.log allowed bypassing Content Security Policy via format directive

What is CVE-2023-23603?

CVE-2023-23603 is a medium-severity vulnerability in Mozilla Firefox, published on 2 Jun 2023. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official 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.

Weakness: CWE-770

Which versions are affected by CVE-2023-23603?

It affects 3 products.

Products include Mozilla Firefox, Mozilla Firefox Esr, Mozilla Thunderbird.

How do I fix CVE-2023-23603?

Upgrade to a fixed version.

Is CVE-2023-23603 being exploited?

There is no known exploitation of CVE-2023-23603 in the wild and no public exploit code.

Other vulnerabilities in Mozilla Firefox

• CVE-2019-11708 Mozilla Firefox and Thunderbird Sandbox Escape Exploited Critical 10.0
• CVE-2010-3765 Mozilla Multiple Products Remote Code Execution Exploited Critical 9.8
• CVE-2022-26486 Mozilla Firefox Use-After-Free Exploited Critical 9.6
• CVE-2022-26485 Mozilla Firefox Use-After-Free Exploited High 8.8
• CVE-2019-11707 Mozilla Firefox and Thunderbird Type Confusion Exploited High 8.8

All Mozilla Firefox vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2023-23603, GHSA-3r46-584r-xx8v, UBUNTU-CVE-2023-23603.