CVE-2026-34598
Medium
Description
YesWiki is a wiki system written in PHP. Prior to version 4.6.0, a stored and blind XSS vulnerability exists in the form title field. A malicious attacker can inject JavaScript without any authentication via a form title that is saved in the backend database. When any user visits that injected page, the JavaScript payload gets executed. This issue has been patched in version 4.6.0.
SeverityMedium
CVSS6.1
Exploit probability—
Product
Yeswiki
PublishedApr 2, 2026
First seenApr 2, 2026
Weakness typeCWE-79Cross-site scripting (XSS)CWE-87CWE-87
How to fix
Update
- yeswiki yeswiki4.6.0 or later
- yeswiki/yeswiki4.6.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| yeswiki yeswiki | v < 4.6.0 | 4.6.0 |
| yeswiki/yeswikiPackagist | v < 4.6.0 | 4.6.0 |
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