Vulnerability in Arc53 Docsgpt
CVE-2026-91201
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L.
EPSS exploit prediction
EPSS: 0.002 (10.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 11th percentile — 10.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/arc53/DocsGPT/issues/2766 (issue-tracking)
- github.com/arc53/DocsGPT (product)
- github.com/arc53/DocsGPT/blob/c36b0af17037449f34449efa97da82becfc9492d/docsgpt/… (technical-description)
- github.com/arc53/DocsGPT/blob/c36b0af17037449f34449efa97da82becfc9492d/frontend… (technical-description)
- github.com/arc53/DocsGPT/blob/c36b0af17037449f34449efa97da82becfc9492d/docsgpt/… (technical-description)
- www.vulncheck.com/advisories/docsgpt-through-0.20.0-oauth-token-disclosure-via-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-91201?
- CVE-2026-91201 is a medium-severity vulnerability in Arc53 Docsgpt, classified under Origin Validation Error. CVSS score: 5.4/10. Published 2026-09-14.
- How severe is CVE-2026-91201?
- Medium severity. CVSS v3 base score is 5.4 out of 10.