CVE-2026-61525 Zammad: Arbitrary File Deletion via Unvalidated Session Identifier in Long Polling Controller
An authenticated attacker can delete arbitrary files on the server via path traversal in the long polling controller when using the default file-based session store.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-61525?
CVE-2026-61525 is a high-severity path traversal vulnerability in zammad, published on 25 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-22
Which versions are affected by CVE-2026-61525?
How do I fix CVE-2026-61525?
No fix has been published for CVE-2026-61525 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-61525 being exploited?
There is no known exploitation of CVE-2026-61525 in the wild and no public exploit code.
Sources
Also known as GHSA-xp9w-hhf3-vfxx.