CVE-2026-91201 DocsGPT through 0.20.0 OAuth Token Disclosure via Wildcard postMessage
Attackers can steal OAuth session tokens via wildcard postMessage to access victim cloud storage connectors.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-91201?
CVE-2026-91201 is a medium-severity vulnerability in arc53 DocsGPT, published on 14 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-346
Which versions are affected by CVE-2026-91201?
How do I fix CVE-2026-91201?
No fix has been published for CVE-2026-91201 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-91201 being exploited?
There is no known exploitation of CVE-2026-91201 in the wild and no public exploit code.
Sources
Also known as GHSA-x85x-q6hq-hm4x.