Foxit PDF Editor/PDF Reader JavaScript Interface improper authorization

Summaryinfo

A vulnerability was found in Foxit PDF Editor and PDF Reader. It has been classified as problematic. This affects an unknown part of the component JavaScript Interface. Performing a manipulation results in improper authorization. This vulnerability is identified as CVE-2026-91788. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability classified as problematic has been found in Foxit PDF Editor and PDF Reader (unknown version). This affects an unknown code block of the component JavaScript Interface. The manipulation with an unknown input leads to a improper authorization vulnerability. CWE is classifying the issue as CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. This is going to have an impact on confidentiality. The summary by CVE is:

When implementing the JavaScript interface, Foxit PDF Editor/Reader did not perform the attribute authorization checks required by the specification. As a result, a trusted malicious PDF could potentially access sensitive content from other documents within the same process and transmit it externally.

The advisory is shared at foxit.com. This vulnerability is uniquely identified as CVE-2026-91788 since 09/15/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for 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 T1548.002 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-2026-85133). 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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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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