KeycloakApplication · Redhat
CVE-2022-4137
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedA reflected cross-site scripting (XSS) vulnerability was found in the 'oob' OAuth endpoint due to incorrect null-byte handling. This issue allows a malicious link to insert an arbitrary URI into a Keycloak error page. This flaw requires a user or administrator to interact with a link in order to be vulnerable. This may compromise user details, allowing it to be changed or collected by an attacker.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceA reflected XSS vulnerability exists in Keycloak's OAuth OOB (out-of-band) endpoint due to improper null-byte handling. Attackers can craft malicious links that inject arbitrary URIs into error pages displayed to users, enabling session hijacking or credential theft through social engineering.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data
KeycloakApplication
all versions
Single Sign OnApplication
= 7.6CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify installed Keycloak or RH-SSO versionCheck the version of Keycloak or Red Hat Single Sign-On by examining system package files, startup logs, or the /authrealms/master endpoint bannerAffected if Running any version of Red Hat Keycloak (all versions) or Red Hat Single Sign-On version 7.6
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Confirm OAuth OOB endpoint is accessibleVerify the OAuth out-of-band endpoint is reachable in your Keycloak/RH-SSO deployment - typically endpoints handling OOB/loopback flow authenticationAffected if The OOB endpoint is exposed and processes authentication requests with redirect_uri parameters
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Test for reflected URI injection in error pagesSend a crafted request to the OOB endpoint with a malicious URI containing null-bytes or arbitrary characters in the redirect_uri parameter, then inspect the error page responseAffected if The error page reflects the injected URI or parameter values without proper encoding or sanitization
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Inspect authentication flow configurationReview the configured authentication flows in the Keycloak admin console under Authentication > Flows to determine if OOB/loopback authentication flows are enabledAffected if OOB authentication flows are active in the deployment
Your environment is affected if running any version of Red Hat Keycloak or RH-SSO 7.6 with the OAuth OOB endpoint enabled and error pages reflect unsanitized input.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataApply the vendor-supplied patch or upgrade Keycloak to a version that properly sanitizes null-bytes in the OOB endpoint; additionally implement Content Security Policy headers to mitigate XSS execution.
Fix this in Keycloak
Scoped from the published advisory
- Consultation4.0 h
- Implementation12.0 h
- Testing6.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $7,328.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2022-4137 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2022-4137 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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