NVD / CVE Program· CNA redhat

CVE-2026-4630: Keycloak: keycloak: unauthorized resource access and data modification via insecure direct object reference

Noroxi assessment

Priority: Monitor (action score 27/100)

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: 0.30% (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) 26.6.2.

Low priority for now. Upgrade to org.keycloak:keycloak-services (Maven) 26.6.2 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 client could exploit an Insecure Direct Object Reference (IDOR) vulnerability in the Authorization Services Protection API endpoint. By knowing or obtaining a resource's unique identifier (UUID) belonging to another Resource Server within the same realm, the client could bypass authorization checks. This allows the client to perform unauthorized GET, PUT, and DELETE operations on resources, leading to information disclosure and potential unauthorized modification or deletion of data.

MediumCVSS 6.8 · v3.1—No exploit Fix available

Broken access control (IDOR)

GHSA-c739-f6xw-6pv2

Published: May 19, 2026
Updated: Jun 17, 2026
EPSS: 0.3% · 22th percentile
CWE: CWE-639

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 27 / 40 · 6.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.3%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · redhat: 6.8; NVD has not scored this yet; the score shown is the CNA’s.

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

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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.

Vendor	Product	CPE
redhat	build of keycloak	cpe:2.3:a:redhat:build_of_keycloak

Affected versions

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

redhat build of keycloak26.4 and later · before 26.4.12

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 26.4
- 26.4.12-1 and laternot affected · rpm
- 26.4-17 and laternot affected · rpm
- 26.4-17 and laternot affected · rpm
Red Hat Red Hat build of Keycloak 26.4.12
- all versionsunknown

Package-level exposure

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

Ecosystem	Package	Affected range	Fix
Maven	org.keycloak:keycloak-services	before 26.6.2	26.6.2

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-2026-37981May 19, 2026 · Keycloak: org.keycloak.authorization: keycloak: information disclosure via broken access control in user lookup endpoint
17Monitor
← EarlierCVE-2026-37982May 19, 2026 · Keycloak: org.keycloak.authentication: keycloak: unauthorized account takeover via webauthn token replay
27Monitor
Later →CVE-2026-7504May 19, 2026 · Org.keycloak/keycloak-services: open redirect when using wildcard valid redirect uris in keycloak
32Monitor

Remediation

Which version to upgrade to

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

Product / package	Fixed version	Source
Maven:org.keycloak:keycloak-services	26.6.2	Package 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.

No credits in the CNA record.

Variant candidates

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

CVE-2026-90871 days apartKeycloak: cross-session email verification proof not bound to upstream identity in first-broker-login
32Monitor
CVE-2026-909937 days apartKeycloak: group-admin escalation to realm-admin
30Monitor
CVE-2026-1705966 days apartKeycloak-services: keycloak-services: information disclosure via role-users endpoint bypasses per-user view filter
26Monitor
CVE-2026-1461445 days apartKeycloak-services: keycloak-services: fgap v2 client scope assignment bypass via clientresource
21Monitor
CVE-2026-379780 days apartKeycloak: org.keycloak.services: keycloak: information disclosure via evaluate-scopes admin api
19Monitor
CVE-2026-1610573 days apartKeycloak-services: keycloak-services: missing per-role authorization on rolecontainerresource composite endpoints
19Monitor

Chain candidates

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

—

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: high · data can be read
Integrity: high · data or configuration can be modified
Availability: none

Attack vector: Network
Attack complexity: High
Privileges required: Low
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: None

Weakness class (CWE)

CWE-639 · Authorization Bypass Through User-Controlled Key

CVSS vector

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

nvd-secondary

Root cause

The endpoint fetches the record by the ID sent in the request, but never checks whether the record belongs to the requesting user.

The bug in code

The whole CWE-639 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1const invoice = await Invoice.findById(req.params.id);
2res.json(invoice);

Fixed

1const invoice = await Invoice.findOne({
2  id: req.params.id,
3  ownerId: req.user.id,
4});
5if (!invoice) return res.sendStatus(404);
6res.json(invoice);

Attack context

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

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

Fix✗ → ✓Sep 28, 2026, 10:48 PM UTC

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

References

access.redhat.com/errata/RHSA-2026:19596

Show all references (3 more)

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

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