M66B FairEmail up to 1.2324 Attachment path traversal

Summaryinfo

A vulnerability, which was classified as problematic, has been found in M66B FairEmail up to 1.2324. Affected is an unknown function of the component Attachment Handler. The manipulation leads to path traversal. This vulnerability is referenced as CVE-2026-68509. The attack can only be performed from a local environment. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in M66B FairEmail up to 1.2324. This issue affects an unknown functionality of the component Attachment Handler. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is integrity, and availability. The summary by CVE is:

FairEmail is a fully featured, open source, privacy-friendly email app for Android. Prior to 1.2325, shared attachment handling does not adequately sanitize an attacker-controlled filename before constructing its destination path. A local attacker-controlled app can therefore supply path components that escape the intended shared attachment directory and overwrite or corrupt files in the FairEmail private data directory, including account or message databases. Exploitation requires app lock using PIN or biometric authentication and user interaction to unlock FairEmail. This issue is fixed in version 1.2325.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-68509 since 07/30/2026. The exploitation is known to be easy. An attack has to be approached locally. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1006 for this issue.

Upgrading to version 1.2325 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• M66B

Name

• FairEmail

Version

• 1.2324

Website

• Product: https://github.com/M66B/FairEmail/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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