CVE-2026-78355 Path Traversal in SendSupportBundle allows File Deletion Outside the Intended Directory
An authenticated administrator can delete files outside the intended directory via path traversal in the SendSupportBundle feature.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-78355?
CVE-2026-78355 is a high-severity path traversal vulnerability in ((OTRS)) Community Edition, published on 12 Oct 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
A path traversal vulnerability in the OTRS SendSupportBundle functionality allows an authenticated administrator to reference file paths outside the intended directory.
This may allow files accessible to the OTRS application process to be deleted. The vulnerability does not bypass operating system file permissions. On OTRS versions prior to OTRS 7, the effective permissions of the web server process are relevant. Starting with OTRS 7, access is limited by the permissions of the dedicated OTRS user. Files with overly permissive ownership or file system permissions may therefore also be affected.
The affected functionality may additionally attempt to include controlled files in a support bundle. However, support bundles are sent to a predefined OTRS support address, and direct disclosure of arbitrary files to the attacker has not been demonstrated.
An attacker therefore requires valid administrative access to exploit the vulnerable functionality. The primary demonstrated impact is the deletion of files outside the intended directory within the effective permissions of the OTRS application process.
This issue affects OTRS:
* 7.0.X * 8.0.X * 2023.X * 2024.X * 2025.X * 2026.X before 2026.7.X
Please note that ((OTRS)) Community Edition 6.x and before are vulnerable. Products based on the ((OTRS)) Community Edition also very likely to be affected
Weakness: CWE-22
Which versions are affected by CVE-2026-78355?
How do I fix CVE-2026-78355?
No fix has been published for CVE-2026-78355 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-2026-78355 being exploited?
There is no known exploitation of CVE-2026-78355 in the wild and no public exploit code.
Sources
Also known as GHSA-mjfj-wgf2-r3pg, UBUNTU-CVE-2026-78355.