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8.8

Zammad allows authenticated users to delete any file

CVE-2026-61525 · published 15 days ago
Summary

Versions 7.0.2 and 7.1.0 of the Zammad help‑desk system let a logged‑in user change a session identifier so the software deletes files outside its own storage area. This can remove important data or system files on the server. Upgrade to Zammad 7.0.3 or 7.1.1, or switch to the Redis session store, to stop the risk.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
zammad zammad = 7.0.2
Original advisory text
Zammad: Arbitrary File Deletion via Unvalidated Session Identifier in Long Polling Controller
Zammad is a web based open source helpdesk/customer support system. In 7.0.2 and 7.1.0, zammad's session management for websocket and long-polling connections is susceptible to a path traversal attack. Session identifiers supplied by the client are insufficiently validated before being used to construct internal file paths. When the file-based session store is active (the default configuration), an authenticated attacker can manipulate the session identifier to reference locations outside the intended storage directory, leading to the deletion of arbitrary files and directories on the server. Exploitation requires only a low-privilege authenticated session and a single crafted request. Instances configured to use the Redis-based session store are not affected. This issue is fixed in versions 7.0.3 and 7.1.1.
References
Fix within
Internet-facing 3 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically
  • Gives an attacker full control
Severity
8.8 High
Exploitation
<1% chance of attack within 30 days
Type
CWE-22Path Traversal
Timeline
Published25 Sep 2026
Updated11 Oct 2026
First seen25 Sep 2026
Sources
CVE-2026-61525 · NVD
CVE-2026-61525 · MITRE
CVE-2026-61525 · OSV
GHSA-xp9w-hhf3-vfxx · GHSA
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