Papermark up to 0.22.0 TUS-based Viewer Upload Endpoint cross-domain policy

Summaryinfo

A vulnerability was found in Papermark up to 0.22.0. It has been declared as problematic. This vulnerability affects unknown code of the component TUS-based Viewer Upload Endpoint. Executing a manipulation can lead to cross-domain policy. The identification of this vulnerability is CVE-2026-57957. The attack may be launched remotely. There is no exploit available. A patch should be applied to remediate this issue.

Detailsinfo

A vulnerability has been found in Papermark up to 0.22.0 and classified as problematic. This vulnerability affects some unknown processing of the component TUS-based Viewer Upload Endpoint. The manipulation with an unknown input leads to a cross-domain policy vulnerability. The CWE definition for the vulnerability is CWE-942. The product uses a cross-domain policy file that includes domains that should not be trusted. As an impact it is known to affect integrity. CVE summarizes:

Papermark through 0.22.0 contains a cross-origin resource sharing (CORS) misconfiguration vulnerability that allows unauthenticated remote attackers to perform credentialed cross-origin requests by exploiting the TUS-based viewer upload endpoint reflecting arbitrary request Origins with Access-Control-Allow-Credentials set to true. Attackers can lure authenticated victims to malicious pages that silently issue credentialed cross-origin requests to upload arbitrary files into victim datarooms and read credentialed responses.

The weakness was shared by George Chen as 2178. The advisory is available at github.com. This vulnerability was named CVE-2026-57957 since 06/26/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-40142). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Name

• Papermark

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16
• 0.17
• 0.18
• 0.19
• 0.20
• 0.21
• 0.22.0

Website

• Product: https://github.com/papermark/papermark/

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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