CVE-2026-6418 PaperCut NG/MF: Path Traversal in Shared Account Synchronization
Administrative users can exploit path traversal in Shared Account Synchronization to read arbitrary local files and disclose sensitive system information.
- 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-2026-6418?
CVE-2026-6418 is a medium-severity path traversal vulnerability in PaperCut NG/MF, published on 5 May 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
An issue was discovered in the Shared Account Synchronization component of PaperCut MF (version 25.0.4). The application allows administrative users to configure a source path for account data synchronization.
Due to a lack of proper path validation and sanitization, an authenticated user with administrative privileges can specify arbitrary file paths on the local file system. This allows for the enumeration of directory structures and the unauthorized reading of sensitive text-based configuration or system files.
When the synchronization process is triggered, the application attempts to parse the contents of the specified file, subsequently exposing the data within the application's account management interface. This vulnerability could lead to the disclosure of sensitive system information or configuration details, depending on the permissions of the service account under which the application is running.
Which versions are affected by CVE-2026-6418?
It affects 2 products.
Products include Papercut Papercut Mf, Papercut Papercut Ng.
How do I fix CVE-2026-6418?
No fix has been published for CVE-2026-6418 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-2026-6418 being exploited?
There is no known exploitation of CVE-2026-6418 in the wild and no public exploit code.
Other vulnerabilities in PaperCut NG/MF
Sources
Also known as GHSA-mhwr-j844-q9pq.