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Response snapshot Oct 29, 2026, 18:26 UTC

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VulnerabilityCVE-2026-9799

Keycloak allows unauthorized access to resources via uma permission ticket bypass

A flaw was found in org.keycloak.authorization. An authenticated user with a granted User-Managed Access (UMA) permission ticket for one resource can exploit this by using a specific permission request prefix to bypass per-resource access control.

At a glance

Exploited
Not known
Severity
4.6 Medium (CVSS 3.1)
Chance of exploitation
Not estimated
Sources
1 source

What to do

GitHub lists first patched versions: org.keycloak:keycloak-services: 26.6.4. Confirm the affected range and upgrade guidance in the exact advisory.

Read GitHub-reviewed advisory GHSA-w3p3-7cjg-vgfw (opens a new tab)

What happened

Description

A flaw was found in org.keycloak.authorization. An authenticated user with a granted User-Managed Access (UMA) permission ticket for one resource can exploit this by using a specific permission request prefix to bypass per-resource access control.

This allows the user to gain unauthorized access to all resources of that type within the same resource server, even if they do not have a ticket for those specific resources. This vulnerability requires the resource server to be configured in PERMISSIVE policy enforcement mode and affects typed resources with ownerManagedAccess enabled, where no explicit policy protects the resource type.

The primary consequence is unauthorized information disclosure or modification of resources.

Continue reading

Affected package ranges reported by GitHub: org.keycloak:keycloak-services: < 26.6.4

Scores and how they were measured

CVSS base severity

4.6

Version 3.1As of

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

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

Not available

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Related technology

Sources

  1. Primary source

    GitHub-reviewed advisory GHSA-w3p3-7cjg-vgfw (opens a new tab)

    The public advisory supplies the description, affected package/version ranges, and any listed CVSS metric. GitHub review is not local review.

    Published Checked

  2. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-w3p3-7cjg-vgfw, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, October 29). Keycloak allows unauthorized access to resources via uma permission ticket bypass (CVE-2026-9799). https://kevwire.com/record/CVE-2026-9799

MLA

"Keycloak allows unauthorized access to resources via uma permission ticket bypass (CVE-2026-9799)." KEVWire, 29 Oct. 2026, kevwire.com/record/CVE-2026-9799.

Chicago

KEVWire. "Keycloak allows unauthorized access to resources via uma permission ticket bypass (CVE-2026-9799)." Last modified October 29, 2026. https://kevwire.com/record/CVE-2026-9799.

Evidence summary (plain text)

Keycloak allows unauthorized access to resources via uma permission ticket bypass (Oct 29, 2026).
A flaw was found in org.keycloak.authorization. An authenticated user with a granted User-Managed Access (UMA) permission ticket for one resource can exploit this by using a specific permission request prefix to bypass per-resource access control. This allows the user to gain unauthorized access to all resources of that type within the same resource server, even if they do not have a ticket for those specific resources.
CVSS 4.6 (version 3.1; evidence as of Oct 29, 2026; https://github.com/advisories/GHSA-w3p3-7cjg-vgfw).
Sources:
GitHub-reviewed advisory GHSA-w3p3-7cjg-vgfw: https://github.com/advisories/GHSA-w3p3-7cjg-vgfw
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc
Record ID: CVE-2026-9799.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Not assessed.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
About this data

This record was ingested from a data source. Retrieved: Oct 29, 2026, 18:26 UTC. Ingestion is not an independent editorial investigation.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

Record JSON

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Record details

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