Foxit PDF Editor/PDF Reader Attachment path traversal

Summaryinfo

A vulnerability classified as critical has been found in Foxit PDF Editor and PDF Reader. Affected is an unknown function of the component Attachment. The manipulation leads to path traversal. This vulnerability is traded as CVE-2026-91797. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Foxit PDF Editor and PDF Reader (version now known). It has been rated as critical. This issue affects some unknown processing of the component Attachment. 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 confidentiality, integrity, and availability. The summary by CVE is:

Foxit PDF Editor/Reader failed to validate the directory traversal path in the attachment file name, resulting in malicious attachments being able to be written to directories outside the expected secure area when the PDF is opened.

The advisory is shared at foxit.com. The identification of this vulnerability is CVE-2026-91797 since 09/15/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/23/2026). MITRE ATT&CK project uses the attack technique T1006 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-85125). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Document Reader Software

Vendor

• Foxit

Name

• PDF Editor
• PDF Reader

License

• free

Website

• Vendor: https://www.foxitsoftware.com/

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CPE 2.2info

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Entryinfo

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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