All vulnerabilities
CVE-2026-104454GHSA-gf57-wg5m-h34q

YesWiki before 4.6.7 ReDoS via wakka.php Edit-Preview Endpoint

YesWiki yeswiki
Open in ThreatlineRecord JSON
CVSS
6.9Medium
ExploitationPublic exploit codeCISA's assessment says proof of concept code is public, assessed 2 Oct 2026. Not in the KEV catalogCISA via CVE List
Exploit odds (EPSS)0.40%Chance of exploitation activity in the next 30 days, higher than 33% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in4.6.7Fixed versionCVE List
Published2 Oct 2026Updated 2 Oct 2026CVE List

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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.

Text from CVE List

Affected versions 2

  • yeswikiaffected: all versions before 4.6.7CVE List
  • yeswikiunaffected: 4.6.7CVE List

References 2