CVE-2023-4045 Information disclosure in Firefox

What is CVE-2023-4045?

CVE-2023-4045 is a medium-severity vulnerability in Debian Debian Linux, published on 1 Aug 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Offscreen Canvas did not properly track cross-origin tainting, which could have been used to access image data from another site in violation of same-origin policy. This vulnerability affects Firefox < 116, Firefox ESR < 102.14, and Firefox ESR < 115.1.

Weakness: CWE-346

Which versions are affected by CVE-2023-4045?

It affects 2 products.

Products include Debian Debian Linux, Mozilla Firefox.

How do I fix CVE-2023-4045?

Upgrade to a fixed version.

Is CVE-2023-4045 being exploited?

There is no known exploitation of CVE-2023-4045 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

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

Also known as DEBIAN-CVE-2023-4045, GHSA-85vg-hqhq-qvx3, UBUNTU-CVE-2023-4045.