EUVD-2026-41111
GHSA-mv7w-qwqh-w2g9
Severity by source
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:X/V:X/RE:X/U:X
Network-reachable compose action needs a low-privilege authenticated session (PR:L) with no special complexity; primitive discloses arbitrary files (C:H) but cannot modify or disrupt (I:N/A:N).
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
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:X/V:X/RE:X/U:X
Lifecycle Timeline
1DescriptionCVE.org
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.
AnalysisAI
Arbitrary file disclosure in Horde IMP webmail before 7.0.1 lets an authenticated user read any file the web server can access by planting directory-traversal sequences after a CKEditor path prefix inside an image src URL when composing mail. A weak stripos() prefix check fails to block traversal appended after the allowed prefix, so file_get_contents() pulls in files like /etc/passwd or configuration secrets and attaches them as MIME parts on the outgoing message. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the message-compose flow of Horde IMP with CKEditor-based HTML/inline-image handling, where an img src URL must first match the expected CKEditor path prefix (to pass the stripos() check) and then carry appended directory-traversal segments referencing the target file. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N, score 7.1) describes network-reachable, low-complexity exploitation requiring only low-privilege authentication, yielding high confidentiality impact with no integrity or availability impact - consistent with an arbitrary file-read primitive. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An authenticated Horde IMP user (or an attacker who tricks a logged-in user into submitting a crafted request via CSRF) composes a message containing an inline image whose src URL begins with the expected CKEditor prefix but appends traversal sequences pointing at a sensitive file. When IMP processes the compose action, stripos() accepts the prefix and file_get_contents() reads the targeted file, attaching its contents as a MIME part on the outgoing email - so the attacker simply mails the file to themselves. … |
| Remediation | Upgrade to Horde IMP 7.0.1, which contains the fix (Vendor-released patch: 7.0.1) via commit fba972fab72ee6871e5d56e6390bee38593085de and PR #85 - see https://github.com/horde/imp/releases/tag/v7.0.1 and https://www.vulncheck.com/advisories/horde-imp-path-traversal-via-compose-php-img-src. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify and catalog all internet-accessible Horde IMP deployments; assess current version and user count. …
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External POC / Exploit Code
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