CVE-2025-24018 YesWiki Vulnerable to Authenticated Stored XSS
Authenticated users can inject malicious scripts via the file attachment feature, leading to account takeover and data theft in YesWiki instances.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-24018?
CVE-2025-24018 is a high-severity cross-site scripting vulnerability in yeswiki, published on 21 Jan 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
YesWiki is a wiki system written in PHP. In versions up to and including 4.4.5, it is possible for an authenticated user with rights to edit/create a page or comment to trigger a stored XSS which will be reflected on any page where the resource is loaded. The vulnerability makes use of the content edition feature and more specifically of the `{{attach}}` component allowing users to attach files/medias to a page. When a file is attached using the `{{attach}}` component, if the resource contained in the `file` attribute doesn't exist, then the server will generate a file upload button containing the filename. This vulnerability allows any malicious authenticated user that has the right to create a comment or edit a page to be able to steal accounts and therefore modify pages, comments, permissions, extract user data (emails), thus impacting the integrity, availability and confidentiality of a YesWiki instance. Version 4.5.0 contains a patch for the issue.
Weakness: CWE-79
Which versions are affected by CVE-2025-24018?
2 open source packages ship an affected version, including yeswiki/yeswiki. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
yeswiki/yeswiki Packagist | All versions | 4.5.0 |
yeswiki/yeswiki Packagist | All versions | 4.5.0 |
Products include Yeswiki Yeswiki.
How do I fix CVE-2025-24018?
Upgrade yeswiki/yeswiki to 4.5.0 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-2025-24018 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-24018 exists.
Other vulnerabilities in yeswiki
- CVE-2025-46348 YesWiki Vulnerable to Unauthenticated Site Backup Creation and Download
- CVE-2024-51478 Use of a Broken or Risky Cryptographic Algorithm in YesWiki
- CVE-2018-1000641 Deserialization in n/a
- CVE-2025-31131 Path Traversal allowing arbitrary read of files in Yeswiki
- CVE-2025-46349 YesWiki Vulnerable to Unauthenticated Reflected Cross-site Scripting
Sources
Also known as GHSA-w59h-3x3q-3p6j.