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Fencer Vulns
critical 9.3

CVE-2022-39222 json

OAuth authorization code exposure in Dex

published 2022-10-03 4 y ago modified 2026-09-10 1 mo ago also GHSA-vh7g-p26c-j2cw , EUVD-2022-7166

cvss
9.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.6%
EPSS 1.6% chance of exploitation in 30 days, percentile 75%
public exploits
0
none known

Summary

Dex is an identity service that uses OpenID Connect to drive authentication for other apps. Dex instances with public clients (and by extension, clients accepting tokens issued by those Dex instances) are affected by this vulnerability if they are running a version prior to 2.35.0. An attacker can exploit this vulnerability by making a victim navigate to a malicious website and guiding them through the OIDC flow, stealing the OAuth authorization code in the process. The authorization code then can be exchanged by the attacker for a token, gaining access to applications accepting that token. Version 2.35.0 has introduced a fix for this issue. Users are advised to upgrade. There are no known workarounds for this issue.

Patch / fix

  • go github.com/dexidp/dex 2.35.0
  • linuxfoundation dex 2.35.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2022-39222 updated cvss 6.5

dexidp: gaining access to applications accepting that token

  • Red Hat RHACS 4.3 for RHEL 8 advanced-cluster-security/rhacs-main-rhel8 4.3.1-9, advanced-cluster-security/rhacs-roxctl-rhel8 4.3.1-3, advanced-cluster-security/rhacs-rhel8-operator 4.3.1-3, advanced-cluster-security/rhacs-central-db-rhel8 4.3.1-4
    fixed: vendor fix RHSA-2023:7725
  • Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/observatorium-rhel8 Red Hat Advanced Cluster Security 3 advanced-cluster-security/rhacs-main-rhel8, advanced-cluster-security/rhacs-roxctl-rhel8, advanced-cluster-security/rhacs-rhel8-operator, advanced-cluster-security/rhacs-central-db-rhel8 Red Hat OpenShift GitOps openshift-gitops-1/dex-rhel8 Red Hat RHACS 4.3 for RHEL 8 advanced-cluster-security/rhacs-scanner-rhel8 4.3.1-4, advanced-cluster-security/rhacs-collector-rhel8 4.3.1-4, advanced-cluster-security/rhacs-operator-bundle 4.3.1-10, advanced-cluster-security/rhacs-scanner-db-rhel8 4.3.1-4, advanced-cluster-security/rhacs-scanner-slim-rhel8 4.3.1-4, advanced-cluster-security/rhacs-collector-slim-rhel8 4.3.1-1, +1 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
total
Assessed
18 mo ago

Exploit prediction

1.58% chance of exploitation in the next 30 days, higher than 75% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/dexidp/dex/security/advisories/GHSA-vh7g-p26c-j2cw referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 9.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
GitHub 3.1 9.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

Affected packages

ecosystem package affected fixed in
go github.com/dexidp/dex
<2.35.0
2.35.0

Affected products

  • dexidp dex

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
  • CWE-862 Missing Authorization

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.