Vulnerability · Published Oct 2, 2026 · Assigned by VulnCheck
CVE-2026-104454YesWiki before 4.6.7 ReDoS via wakka.php Edit-Preview Endpoint
Medium 5.3
In plain English
A medium-severity regular-expression denial of service in yeswiki from YesWiki. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities).
Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.4%top 65.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
YesWiki before 4.6.7 contains an algorithmic-complexity denial of service in the wakka.php formatter due to an O(n^2) markdown-link regex. Unauthenticated attackers can submit a small crafted body of bracket characters to the page-edit preview endpoint to pin PHP-FPM workers and saturate the pool.
Affected products (as reported)
Weakness: CWE-1333 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
References
- GitHub Security Advisory (GHSA-gf57-wg5m-h34q) vendor-advisory
- VulnCheck Advisory: YesWiki before 4.6.7 ReDoS via wakka.php Edit-Preview Endpoint third-party-advisory