CVE-2026-104454

MEDIUM 5.3

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

CVSS Score

5.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-1333
Vendor	yeswiki
Product	yeswiki
Published	Oct 2, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Affected Versions

YesWiki / yeswiki

0 < 4.6.7

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/YesWiki/yeswiki/security/advisories/GHSA-gf57-wg5m-h34q vulncheck.com: https://www.vulncheck.com/advisories/yeswiki-before-4.6.7-redos-via-wakka-php-edit-preview-endpoint

Credits

🔍 manus-use