Dolibarr up to 23.0.4 emailcollector emailcollector.lib.php saveAttachment filename path traversal

Summaryinfo

A vulnerability categorized as critical has been discovered in Dolibarr up to 23.0.4. Impacted is the function saveAttachment of the file htdocs/emailcollector/lib/emailcollector.lib.php of the component emailcollector. The manipulation of the argument filename results in path traversal. This vulnerability is known as CVE-2026-81730. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability, which was classified as critical, was found in Dolibarr up to 23.0.4. Affected is the function saveAttachment of the file htdocs/emailcollector/lib/emailcollector.lib.php of the component emailcollector. The manipulation of the argument filename with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on integrity, and availability. CVE summarizes:

Dolibarr 9.0.0 through 23.0.4 saves inbound email attachments under the name supplied in the message's MIME headers without reducing it to a safe basename. The global saveAttachment() in htdocs/emailcollector/lib/emailcollector.lib.php builds $filepath = $path . $filename . '.' . $ext and hands it to file_put_contents(), and the private saveAttachment() in htdocs/emailcollector/class/emailcollector.class.php writes to $destdir.'/'.$filename; the name reaches both from the attachment's own getName() or getFilename() value by way of the record-join, create-ticket and create-project operations. A traversal sequence in the filename therefore survives intact, so any sender who can email a mailbox that an EmailCollector monitors, which is the module's ordinary use for a support or ticket inbox, can place attacker-controlled content outside the per-object attachment directory without holding a Dolibarr account. Under the hardened layout Dolibarr's SECURITY.md requires, with htdocs read-only, the write is confined to the documents tree and corrupts or forges other objects' documents; where htdocs is writable the same primitive reaches a web-executable path. Version 24.0.0 applies dol_sanitizePathName() and dol_sanitizeFileName() before the write.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-81730 since 08/27/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

By approaching the search of inurl:htdocs/emailcollector/lib/emailcollector.lib.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 24.0.0 eliminates this vulnerability. Applying the patch 264a44defb5e438689c75679617f6edc4c038abc is able to eliminate this problem.

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Productinfo

Type

• Enterprise Resource Planning Software

Name

• Dolibarr

Version

• 23.0.0
• 23.0.1
• 23.0.2
• 23.0.3
• 23.0.4

License

• open-source

Website

• Product: https://github.com/Dolibarr/dolibarr/

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