CVE-2026-91201

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreHIGH confidence

Score 5.4 from GitHub Security Advisory published 2026-09-15. a secondary CVSS source baseline 5.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.4Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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
5.4
EG Score
5.4(high)
EG Risk
24(Track)
EG Risk 24/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity54% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
4%
KEV
Not listed

Published

September 14, 2026

Last Modified

September 18, 2026

Advisory Details (6)

Auto-updated Sep 14, 2026
No patch confirmed yet.
generic

DocsGPT through 0.20.0 OAuth Token Disclosure via Wildcard postMessage | Advisories | VulnCheck

https://www.vulncheck.com/advisories/docsgpt-through-0.20.0-oauth-token-disclosure-via-wildcard-postmessage
generic

DocsGPT/docsgpt/api/connector/routes.py at c36b0af17037449f34449efa97da82becfc9492d · arc53/DocsGPT · GitHub

https://github.com/arc53/DocsGPT/blob/c36b0af17037449f34449efa97da82becfc9492d/docsgpt/api/connector/routes.py#L344-L366
generic

DocsGPT/frontend/src/components/ConnectorAuth.tsx at c36b0af17037449f34449efa97da82becfc9492d · arc53/DocsGPT · GitHub

https://github.com/arc53/DocsGPT/blob/c36b0af17037449f34449efa97da82becfc9492d/frontend/src/components/ConnectorAuth.tsx#L57-L80
generic

DocsGPT/docsgpt/api/connector/routes.py at c36b0af17037449f34449efa97da82becfc9492d · arc53/DocsGPT · GitHub

https://github.com/arc53/DocsGPT/blob/c36b0af17037449f34449efa97da82becfc9492d/docsgpt/api/connector/routes.py#L515-L527
generic

GitHub - arc53/DocsGPT: Private AI platform for agents, assistants and enterprise search. Built-in Agent Builder, Deep research, Document analysis, Multi-model support, and API connectivity for agents. · GitHub

https://github.com/arc53/DocsGPT
generic

🐛 Bug Report: OAuth connector session token theft via postMessage wildcard origin · Issue #2766 · arc53/DocsGPT · GitHub

https://github.com/arc53/DocsGPT/issues/2766

Vendor Advisories for CVE-2026-91201(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 20× in last 7d / 20× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-19 16:31 UTCEG score recompute
  2. 2026-09-19 16:31 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 18:33 UTCEG score recompute
  5. 2026-09-18 18:33 UTCGHSA enrichment
  6. 2026-09-18 17:29 UTCEG score recompute
  7. 2026-09-18 17:29 UTCGHSA enrichment
  8. 2026-09-18 17:21 UTCEG score recompute
  9. 2026-09-18 17:21 UTCGHSA enrichment
  10. 2026-09-17 19:32 UTCEPSS rescore
  11. 2026-09-17 19:23 UTCGHSA enrichment
  12. 2026-09-16 19:19 UTCEG score recompute
  13. 2026-09-16 19:19 UTCGHSA enrichment
  14. 2026-09-16 14:09 UTCEPSS rescore
  15. 2026-09-16 05:15 UTCEPSS rescore
  16. 2026-09-15 21:21 UTCEG score recompute
  17. 2026-09-15 21:21 UTCGHSA enrichment
  18. 2026-09-14 23:22 UTCEG score recompute
  19. 2026-09-14 22:24 UTCEG score recompute
  20. 2026-09-14 22:24 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-91201?
CVE-2026-91201 is a medium vulnerability published on September 14, 2026. 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…
When was CVE-2026-91201 disclosed?
CVE-2026-91201 was first published in the National Vulnerability Database on September 14, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-91201 actively exploited?
CVE-2026-91201 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 96.3% of all scored CVEs.
What is the CVSS score of CVE-2026-91201?
CVE-2026-91201 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2026-91201?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-91201, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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