CVE-2025-46349: YesWiki Vulnerable to Unauthenticated Reflected Cross-site Scripting

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2025-04-29 · updated 2026-06-17
Weakness: CWE-79

Description

YesWiki is a wiki system written in PHP. Prior to version 4.5.4, YesWiki is vulnerable to reflected XSS in the file upload form. This vulnerability allows any malicious unauthenticated user to create a link that can be clicked on by the victim to perform arbitrary actions. This issue has been patched in version 4.5.4.

Affected products

yeswiki: before 4.5.4 — fixed in 4.5.4

How to fix

Upgrade to a fixed version: yeswiki 4.5.4. Check the vendor advisory for mitigations.

References

https://github.com/YesWiki/yeswiki/pull/1264/commits/6edde40eb7eeb5d60619ac4d1e0a0422d92e9524
https://github.com/YesWiki/yeswiki/security/advisories/GHSA-2f8p-qqx2-gwr2
https://github.com/YesWiki/yeswiki/security/advisories/GHSA-2f8p-qqx2-gwr2

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