Quick answers
- Is CVE-2026-91201 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-91201 being exploited in the wild.
- How severe is CVE-2026-91201?
- Medium severity, with a CVSS score of 5.4, published 14 September 2026.
- Which products and versions are affected?
- Arc53 DocsGPT through 0.20.0.
- Is there a fix for CVE-2026-91201?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-91201 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-91201?
- Check whether you run Arc53 DocsGPT at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
DocsGPT through version 0.20.0 contains a missing origin validation vulnerability in the callback-status OAuth endpoint. The endpoint posts OAuth connector session tokens and provider account emails to a wildcard target origin without verifying the sender's origin, violating same-origin policy protections. An attacker can position themselves as window.opener during an OAuth authorization flow to intercept these sensitive tokens. With intercepted tokens, an attacker can disconnect victims' cloud storage connectors and potentially access or manipulate linked cloud resources. This vulnerability requires user interaction (the user must initiate OAuth flow) but does not require authentication from the attacker.
Affected products
- arc53 DocsGPT through 0.20.0
Timeline
- 2026-09-14: disclosed