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.

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.

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.

Affected products

Arc53 Docsgpt

Weakness classification (CWE)

CWE-346 — Origin Validation Error

References

disclosure@vulncheck.com (issue-tracking)
disclosure@vulncheck.com (product)
disclosure@vulncheck.com (technical-description)
disclosure@vulncheck.com (technical-description)
disclosure@vulncheck.com (technical-description)
disclosure@vulncheck.com (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.