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EUVD-2026-215266

2026-10-22T01:09:10.247567+00:00

EUVD-2026-215266

fkie_cve-2025-24019

2026-10-22T01:09:10.247637+00:00

YesWiki is a wiki system written in PHP. In versions up to and including 4.4.5, it is possible for any authenticated user, through the use of the filemanager to delete any file owned by the user running the FastCGI Process Manager (FPM) on the host without any limitation on the filesystem's scope. This vulnerability allows any authenticated user to arbitrarily remove content from the Wiki resulting in partial loss of data and defacement/deterioration of the website. In the context of a container installation of YesWiki without any modification, the `yeswiki` files (for example .php) are not owned by the same user (root) as the one running the FPM process (www-data). However in a standard installation, www-data may also be the owner of the PHP files, allowing a malicious user to completely cut the access to the wiki by deleting all important PHP files (like index.php or core files of YesWiki). Version 4.5.0 contains a patch for this issue.

GHSA-43c9-gw4x-pcx6 — Authenticated arbitrary file deletion in YesWiki

2026-10-22T01:09:10.247711+00:00

Affected: Packagist: yeswiki/yeswiki

# Authenticated arbitrary file deletion in YesWiki <= 4.4.5

### Summary It is possible for any authenticated user, through the use of the filemanager to delete any file owned by the user running the FastCGI Process Manager (FPM) on the host without any limitation on the filesystem's scope.

This Proof of Concept has been performed using the followings: - YesWiki v4.4.5 (`doryphore-dev` branch, latest) - Docker environnment (`docker/docker-compose.yml`) - Docker v27.5.0 - Default installation

### Details The vulnerability makes use of the `filemanager` that allows a user to manage files that are attached to a resource when they have owner permission on it. This part of the code is managed in `tools/attach/libs/attach.lib.php`

```php public function doFileManager($isAction = false) { $do = (isset($_GET['do']) && $_GET['do']) ? $_GET['do'] : ''; switch ($do) { case 'restore': $this->fmRestore(); $this->fmShow(true, $isAction); break; case 'erase': $this->fmErase(); $this->fmShow(true, $isAction); break; case 'del': $this->fmDelete(); $this->fmShow(false, $isAction); break; case 'trash': $this->fmShow(true, $isAction); break; case 'emptytrash': $this->fmEmptyTrash(); //pas de break car apres un emptytrash => retour au gestionnaire // no break default: $thi…