arc53 DocsGPT up to 0.20.0 Callback Status Endpoint improper authorization

Summaryinfo

A vulnerability was found in arc53 DocsGPT up to 0.20.0. It has been classified as critical. Affected by this issue is some unknown functionality of the component Callback Status Endpoint. The manipulation leads to improper authorization. This vulnerability is uniquely identified as CVE-2026-91201. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as critical, has been found in arc53 DocsGPT up to 0.20.0. This issue affects an unknown code block of the component Callback Status Endpoint. The manipulation with an unknown input leads to a improper authorization vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

DocsGPT through 0.20.0 posts OAuth connector session tokens to a wildcard target origin in the callback-status endpoint without validating sender origin. Attackers can obtain session tokens and provider account emails by acting as window.opener during OAuth authorization, then use tokens to disconnect victims' cloud storage connectors.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-91201 since 09/14/2026. 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 09/15/2026). 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-2026-78210). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• arc53

Name

• DocsGPT

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

Website

• Product: https://github.com/arc53/DocsGPT/

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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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