CVE-2026-58451 Horde IMP < 7.0.1 Path Traversal via Compose.php img src
Authenticated attackers can read arbitrary server files via path traversal in Horde IMP, potentially exfiltrating sensitive data through email.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-58451?
CVE-2026-58451 is a high-severity path traversal vulnerability in horde imp, published on 1 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-22
Which versions are affected by CVE-2026-58451?
How do I fix CVE-2026-58451?
No fix has been published for CVE-2026-58451 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-58451 being exploited?
There is no known exploitation of CVE-2026-58451 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-58451, GHSA-mv7w-qwqh-w2g9, UBUNTU-CVE-2026-58451.