Horde IMP up to 7.0.0 lib/Compose.php stripos path traversal

Summaryinfo

A vulnerability classified as critical has been found in Horde IMP up to 7.0.0. Affected by this vulnerability is the function stripos in the library lib/Compose.php. This manipulation causes path traversal. This vulnerability is handled as CVE-2026-58451. The attack can be initiated remotely. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Horde IMP up to 7.0.0. Affected by this vulnerability is the function stripos in the library lib/Compose.php. The manipulation with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality. The summary by CVE is:

Horde IMP before 7.0.1 contains a path traversal vulnerability in lib/Compose.php that allows authenticated attackers to read arbitrary files from the server filesystem by embedding traversal sequences after a CKEditor path prefix in img src URLs. Attackers can bypass the stripos() prefix validation by appending sequences such as traversal segments after the matching prefix, causing file_get_contents() to read sensitive files whose contents are then exfiltrated as MIME parts in outgoing email; unauthenticated exploitation is also achievable via CSRF against an active authenticated session.

The weakness was released by evan. The advisory is shared at github.com. This vulnerability is known as CVE-2026-58451 since 06/30/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1006 for this issue.

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

Upgrading to version 7.0.1 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch fba972fab72ee6871e5d56e6390bee38593085de is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

• Groupware Software

Vendor

• Horde

Name

• IMP

Version

• 7.0

License

• free

Website

• Vendor: https://www.horde.org/
• Product: https://github.com/horde/imp/

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

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