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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.

PUBLISHED Reserved 2026-06-30 | Published 2026-07-01 | Updated 2026-07-14 | Assigner VulnCheck




HIGH: 7.1CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

MEDIUM: 6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Problem types

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Product status

Default status
affected

Any version before 7.0.1
affected

Credits

evan finder

VulnCheck finder

References

seclists.org/fulldisclosure/2026/Jul/8

github.com/horde/imp/releases/tag/v7.0.1 (Release Notes) release-notes

github.com/horde/imp/pull/85 (Fix PR) issue-tracking

github.com/...ommit/fba972fab72ee6871e5d56e6390bee38593085de (Fix Commit) patch

www.horde.org/apps/imp (Project Webpage) product

www.vulncheck.com/...-path-traversal-via-compose-php-img-src third-party-advisory

blog.evan.lat/posts/CVE-2026-58451/ (Researcher Disclosure) technical-description exploit

cve.org (CVE-2026-58451)

nvd.nist.gov (CVE-2026-58451)

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