CVE-2023-45363 MediaWiki Denial of Service vulnerability

What is CVE-2023-45363?

CVE-2023-45363 is a high-severity denial of service vulnerability in Debian Debian Linux, published on 9 Oct 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An issue was discovered in ApiPageSet.php in MediaWiki before 1.35.12, 1.36.x through 1.39.x before 1.39.5, and 1.40.x before 1.40.1. It allows attackers to cause a denial of service (unbounded loop and RequestTimeoutException) when querying pages redirected to other variants with redirects and converttitles set.

Weakness: CWE-835

Which versions are affected by CVE-2023-45363?

7 open source packages ship an affected version, including mediawiki/core and mediawiki. It affects 2 products.

Products include Debian Debian Linux, Mediawiki Mediawiki.

How do I fix CVE-2023-45363?

Upgrade mediawiki/core to a fixed version for your release line: 1.35.12, 1.39.5 or 1.40.1.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2023-45363 being exploited?

There is no known exploitation of CVE-2023-45363 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 BIT-mediawiki-2023-45363, DEBIAN-CVE-2023-45363, GHSA-w5fx-cx7f-6vr9, UBUNTU-CVE-2023-45363.