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Single Sign OnApplication · Redhat

CVE-2023-6134

MEDIUM · 5.4 CVSS v3.1 Published 2023-12-14
Fix available
A fix is available. Upgrade to 7.6 / 22.0.7 or later.
See remediation →
58/100
Remediation priority · Elevated
Public exploit Remotely reachable

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 · unedited
A flaw was found in Keycloak that prevents certain schemes in redirects, but permits them if a wildcard is appended to the token. This issue could allow an attacker to submit a specially crafted request leading to cross-site scripting (XSS) or further attacks. This flaw is the result of an incomplete fix for CVE-2020-10748.

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
How this class of weakness works · CWE-79

Untrusted input is placed into a web page without being neutralised, so an attacker's markup or script executes in another user's browser. That can hijack sessions, capture keystrokes, or silently perform actions as the victim. Fixing it properly means context-aware output encoding everywhere data meets HTML, backed by a content-security policy as a second line of defence.

General guidance for the cross-site scripting (xss) class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

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
Single Sign OnApplication
Affected:< 7.6all versions
KeycloakApplication
Affected:< 22.0.7
Openshift Container PlatformApplication
Affected:= 4.11= 4.12
Openshift Container Platform For PowerApplication
Affected:= 4.9= 4.10
Openshift Container Platform Ibm Z SystemsApplication
Affected:= 4.9= 4.10

CVSS 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
Low
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

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.

dbcve · scoped
Upgrade available Upgrade to 7.6 / 22.0.7 or later
Fixed in 7.622.0.7
Recommended fix High confidence

Keycloak >= 22.0.7 or Single Sign On >= 7.6

  1. Upgrade Keycloak to version 22.0.7 or later
  2. If using Red Hat Single Sign On (RH-SSO), upgrade to version 7.6 or later
  3. For OpenShift Container Platform deployments, apply the corresponding security advisory for your version (4.9, 4.10, 4.11, or 4.12) from Red Hat errata
  4. After upgrading, verify the redirect URI validation works correctly by testing with various redirect URLs including those with wildcards
  5. Confirm the fix for CVE-2020-10748 is properly applied by validating that schemes like javascript: are blocked even with wildcard tokens appended
Caveat Standard minor version upgrade considerations apply - review release notes for breaking changes between your current version and 22.0.7

Generated from the published advisory — verify against the referenced sources before acting.

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $900. Get the upgrade done

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2023-6134 in production — separate from our analysis above.

No notes yet

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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