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Vulnerability record · CVE-2026-58451 · published 1 July 2026

CVE-2026-58451: Path traversal vulnerability

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.

7.1 CVSS 4.0 High EPSS 0.56% · top 55.4% CWE-22 · Path traversal Deferred
7.1CVSS 4.0 base score
0.56%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
7References
14 Jul 2026Last modified by NVD

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
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

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Source: NIST National Vulnerability Database (record CVE-2026-58451), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.