CVE-2026-58451 Affecting php-horde-imp package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN12-PHPHORDEIMP-17794407
- published2 Jul 2026
- disclosed1 Jul 2026
Introduced: 1 Jul 2026
CVE-2026-58451 (opens in a new tab)How to fix?
There is no fixed version for Debian:12 php-horde-imp.
NVD Description
Note: Versions mentioned in the description apply only to the upstream php-horde-imp package and not the php-horde-imp package as distributed by Debian.
See How to fix? for Debian:12 relevant fixed versions and status.
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.
References
- https://security-tracker.debian.org/tracker/CVE-2026-58451
- https://blog.evan.lat/posts/CVE-2026-58451/
- https://github.com/horde/imp/commit/fba972fab72ee6871e5d56e6390bee38593085de
- https://github.com/horde/imp/pull/85
- https://github.com/horde/imp/releases/tag/v7.0.1
- https://www.horde.org/apps/imp
- https://www.vulncheck.com/advisories/horde-imp-path-traversal-via-compose-php-img-src
- http://seclists.org/fulldisclosure/2026/Jul/8