Documenso Signing sign-field-with-token.ts privileges management

Summaryinfo

A vulnerability, which was classified as critical, was found in Documenso. Affected by this issue is some unknown functionality of the file sign-field-with-token.ts of the component Signing Handler. The manipulation results in privileges management. This vulnerability was named CVE-2026-71247. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in Documenso (affected version not known). It has been classified as critical. Affected is some unknown functionality of the file sign-field-with-token.ts of the component Signing Handler. The manipulation with an unknown input leads to a privileges management vulnerability. CWE is classifying the issue as CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Documenso's sign-field-with-token.ts, used by the live document-signing UI, allows a recipient with the ASSISTANT role to fetch and complete fields belonging to any later-or-equal-order, not-yet-signed recipient in the same envelope, with no restriction on field type. The handler upserts a Signature record tied to the target field's recipientId with no check that field.type is SIGNATURE and the acting recipient owns it. A newer V2 signing path (sign-envelope-field.ts) explicitly blocks assistants from completing SIGNATURE fields, and the project's own test suite comments confirm this guard is absent from the V1 path used here. In a sequential-signing document, an assistant recipient can therefore forge another signer's signature field.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-71247 since 08/05/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 08/05/2026). This vulnerability is assigned to T1068 by the MITRE ATT&CK project.

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

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

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• Documenso

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

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