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CVE-2026-4874· NVD / CVE Program· CNA redhat

Org.keycloak.protocol.oidc.grants: org.keycloak.services.managers: keycloak: server-side request forgery via oidc token endpoint manipulation

Noroxi assessment

Priority: Monitor (action score 12/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.32% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: org.keycloak:keycloak-services (Maven) 26.6.3, 26.4.13.

Low priority for now. Upgrade to org.keycloak:keycloak-services (Maven) 26.6.3, 26.4.13 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

A flaw was found in Keycloak. An authenticated attacker can perform Server-Side Request Forgery (SSRF) by manipulating the `client_session_host` parameter during refresh token requests. This occurs when a Keycloak client is configured to use the `backchannel.logout.url` with the `application.session.host` placeholder. Successful exploitation allows the attacker to make HTTP requests from the Keycloak server’s network context, potentially probing internal networks or internal APIs, leading to information disclosure.

LowCVSS 3.1 · v3.1—No exploit Fix available
Published
Mar 26, 2026
Updated
Jun 26, 2026
EPSS
0.3% · 24th percentile

Report tools

JSON

Action score

12

Monitor

Low priority for now.

CVSS
12 / 40 · 3.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
3.1
CNA · redhat
3.1
agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-4874

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
redhatbuild of keycloak
redhatjboss enterprise application platform
redhatjboss enterprise application platform expansion pack
redhatsingle sign-on

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • redhat build of keycloakall versions
  • redhat jboss enterprise application platform8.0.0
  • redhat jboss enterprise application platform expansion packall versions
  • redhat single sign-on7.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • Red Hat Red Hat Build of Keycloak

    • all versionsaffected
    • all versionsaffected

  • Red Hat Red Hat build of Keycloak 26.4

    • 26.4.13-1 and laternot affected · rpm
    • 26.4-19 and laternot affected · rpm
    • 26.4-19 and laternot affected · rpm

  • Red Hat Red Hat build of Keycloak 26.4.13

    • all versionsunknown

  • Red Hat Red Hat build of Keycloak 26.6

    • 26.6.3-3 and laternot affected · rpm
    • 26.6-6 and laternot affected · rpm
    • 26.6-6 and laternot affected · rpm

  • Red Hat Red Hat build of Keycloak 26.6.3

    • all versionsunknown

  • Red Hat Red Hat JBoss Enterprise Application Platform 8

    • all versionsaffected

  • Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack

    • all versionsaffected

  • Red Hat Red Hat Single Sign-On 7

    • all versionsaffected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Mavenorg.keycloak:keycloak-servicesfrom 26.5.0 · before 26.6.326.6.3
Mavenorg.keycloak:keycloak-servicesbefore 26.4.1326.4.13

Same product

redhat: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-16442Keycloak-services: keycloak-services: saml idp-initiated broker login bypasses link-only restriction
    39Monitor
  • CVE-2026-16443Keycloak-services: keycloak-services: saml broker metadata import disables response signature validation
    36Monitor
  • CVE-2026-15572Keycloak-services: keycloak-services: dcr protocol mapper type-swap policy bypass allows privilege escalation
    35Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-4628Mar 23, 2026 · Keycloak: org.keycloak.authorization: keycloak: unauthorized resource modification due to improper access control
    17Monitor
  • ← EarlierCVE-2026-4633Mar 23, 2026 · Keycloak: keycloak: user enumeration via differential error messages
    14Monitor
  • Later →CVE-2026-3121Mar 26, 2026 · Keycloak: org.keycloak/keycloak-services: keycloak: privilege escalation via manage-clients permission
    28Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Maven:org.keycloak:keycloak-services26.4.13Package registry (OSV)
Maven:org.keycloak:keycloak-services26.6.3Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-43668 days apartKeycloak-services: blind server-side request forgery (ssrf) via http redirect handling in keycloak
    23Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

  • CVE-2026-304721 days apartOrg.keycloak.broker.saml: keycloak saml broker: authentication bypass due to disabled saml client completing idp-initiated login
    35Monitor
  • CVE-2026-26039 days apartKeycloak: keycloak: unauthorized authentication via disabled saml identity provider
    32Monitor
  • CVE-2026-300921 days apartOrg.keycloak/keycloak-services: improper enforcement of disabled identity provider in identitybrokerservice (authentication bypass)
    32Monitor
  • CVE-2026-1180091 days apartOrg.keycloak:keycloak-services: keycloak: authentication bypass via jwt algorithm confusion
    32Monitor

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
low · data can be read
Integrity
none
Availability
none
Attack vector
Network
Attack complexity
High
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-918 · Server-Side Request Forgery (SSRF)

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (5 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records