CVE-2026-9094: Casdoor GetTokenExchangeToken Bypass Through Lack Of Vulnerability

CRITICAL
Advisory Identifier: GHSA-c9w5-qp6m-m395
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CVSS 9.8
CWE-269 CWE-863
Published
Advisory Summary

CVE-2026-9094 is a CRITICAL (CVSS 9.8) gettokenexchangetoken bypass through lack of vulnerability (CWE-269: Improper Privilege Management) affecting Casdoor libraries in the Go ecosystem. The issue involves gettokenexchangetoken bypass through lack of cross-organization jwt signature check. Remediation is available by upgrading affected packages to version 2.387.0.

CVE-2026-9094 at a Glance

CVE Identifier CVE-2026-9094
GHSA Identifier GHSA-c9w5-qp6m-m395
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-269: Improper Privilege Management
Affected Product Casdoor
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 9.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2026-9094

To remediate this vulnerability, upgrade all affected Casdoor dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/casdoor/casdoor fixed: 2.387.0 
Upgrade github.com/casdoor/casdoor to 2.387.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for github.com/casdoor/casdoor

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-9094, inspect your project dependencies for Casdoor:

inspect dependencies for github.com/casdoor/casdoor

Analyze the terminal output to locate any version of Casdoor in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.387.0), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-269: Improper Privilege Management, where the product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. In Casdoor, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

Casdoor versions 2.362.0 and earlier contain a vulnerability enabling cross-organization token exchange. The GetTokenExchangeToken function in object/token_oauth.go validates JWT signatures but does not verify that the token's user belongs to the same organization as the target application. This can result in privilege escalation across organizational boundaries.

CVE-2026-9094 Affected Casdoor Versions

1 component(s)
Fixed Versions:
2.387.0
Product / Package Ecosystem Affected Versions Fixed Version
github.com/casdoor/casdoor
golang/github.com/casdoor/casdoor
Go
< 2.387.0
2.387.0

References

NVD — CVE-2026-9094 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-9094
Security Fix Commit FIX COMMIT
https://github.com/casdoor/casdoor/commit/d92b8568686d
Casdoor Source Repository REPOSITORY
https://github.com/casdoor/casdoor
kb.cert.org/vuls/id/780781 WEB
https://kb.cert.org/vuls/id/780781

Frequently Asked Questions

What is CVE-2026-9094?
CVE-2026-9094 is a security vulnerability in Casdoor involving GetTokenExchangeToken bypass through lack of cross-organization JWT signature check under CWE-269: Improper Privilege Management.
Which Casdoor versions are affected?
Affected versions include releases prior to 2.387.0 across affected packages: github.com/casdoor/casdoor.
What version fixes CVE-2026-9094?
Upgrading to 2.387.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/casdoor/casdoor affected?
Yes, github.com/casdoor/casdoor is affected in releases prior to 2.387.0. Upgrade your dependency to 2.387.0 or later.
What is the CVSS score of CVE-2026-9094?
CVE-2026-9094 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2026-9094?
CVE-2026-9094 is classified under CWE-269: Improper Privilege Management (The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.).
How can I check Go dependencies for CVE-2026-9094?
Run the dependency tree command: 'inspect dependencies for github.com/casdoor/casdoor'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-c9w5-qp6m-m395",
  "modified" : "2026-07-09T23:32:36Z",
  "published" : "2026-05-28T18:30:32Z",
  "aliases" : [ "CVE-2026-9094" ],
  "summary" : "Casdoor: GetTokenExchangeToken bypass through lack of cross-organization JWT signature check",
  "details" : "Casdoor versions 2.362.0 and earlier contain a vulnerability enabling cross-organization token exchange. The GetTokenExchangeToken function in object/token_oauth.go validates JWT signatures but does not verify that the token's user belongs to the same organization as the target application. This can result in privilege escalation across organizational boundaries.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/casdoor/casdoor"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.387.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-9094"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/casdoor/casdoor/commit/d92b8568686d"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/casdoor/casdoor"
  }, {
    "type" : "WEB",
    "url" : "https://kb.cert.org/vuls/id/780781"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-269", "CWE-863" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-07-09T23:32:36Z",
    "nvd_published_at" : "2026-05-28T17:16:34Z"
  }
}