CVE-2025-46549 Yeswiki Vulnerable to Unauthenticated Reflected Cross-site Scripting

Medium 4.3 Published 29 Apr 2025 Updated 30 Apr 2025

An attacker can steal authenticated user cookies via a malicious link, leading to session takeover or website defacement in YesWiki.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: Available

What is CVE-2025-46549?

CVE-2025-46549 is a medium-severity cross-site scripting vulnerability in yeswiki, published on 29 Apr 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

YesWiki is a wiki system written in PHP. Prior to version 4.5.4, an attacker can use a reflected cross-site scripting attack to steal cookies from an authenticated user by having them click on a malicious link. Stolen cookies allow the attacker to take over the user’s session. This vulnerability may also allow attackers to deface the website or embed malicious content. This issue has been patched in version 4.5.4.

Weakness: CWE-79

Which versions are affected by CVE-2025-46549?

2 open source packages ship an affected version, including yeswiki/yeswiki. It affects 1 product.

Package	Affected	Fixed in
`yeswiki/yeswiki` Packagist	All versions	`4.5.4`
`yeswiki/yeswiki` Packagist	All versions	`4.5.4`

Products include Yeswiki Yeswiki.

How do I fix CVE-2025-46549?

Upgrade yeswiki/yeswiki to 4.5.4 or later.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2025-46549 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-46549 exists.

Public exploit code: 1 Nuclei template.

Sources

Also known as GHSA-r9gv-qffm-xw6f.