CVE-2026-58451

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

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

CVSS 3.1

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

EPSS

0.6% chance of exploitation in the next 30 days; higher than 46% of CVEs (scores of 2026-10-25)

CWE

CWE-22

Published

2026-07-01

Modified

2026-10-25

Record from

the NVD, synced 2026-10-25

References

• 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

Check your stackJSON