GHSA-c9w5-qp6m-m395: github.com/casdoor/casdoor (CVE-2026-9094)

Casdoor: GetTokenExchangeToken bypass through lack of cross-organization JWT signature check

CVSS 9.8 CriticalCriticalEPSS 0.0042 · 36th percentile

Critical, because:

CVSS score 9.8: 9.0 or more.

Published by the GitHub Advisory Database at 28 May 2026, 18:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

Package	Ecosystem	Affected	Fixed in
github.com/casdoor/casdoor	Go	<2.387.0	2.387.0

Identifiers

GHSA-c9w5-qp6m-m395 · CVE-2026-9094 · GO-2026-5953

Weakness (CWE)

CWE-269 · CWE-863

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Casdoor versions before 2.387.0 are vulnerable. The GetTokenExchangeToken function checks JWT signatures but does not confirm that the token's user belongs to the same organization as the target application, so an attacker holding a valid token from one organization may be able to exchange it for access across organizational boundaries. The source gives few details about the required privileges. Upgrade to Casdoor 2.387.0 or later.

Written 6 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
9.8	Critical	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	GitHub Advisory Database

CISA KEV Not listed.
EPSS 0.0042, the 36th percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:59 UTC First seen by agentprime
31 Oct 2026, 14:59 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.