# Keycloak vulnerable to authorization bypass via incorrect uri comparison

Advisory record · `GHSA-f5p5-6xmx-p252`

- **Identifiers:** `GHSA-f5p5-6xmx-p252` · `BIT-keycloak-2026-9800` · `CVE-2026-9800`
- **State:** Confirmed
- **Severity:** CVSS 8.1 High
- **Critical:** No
- **Weakness (CWE):** [CWE-1025](https://cwe.mitre.org/data/definitions/1025.html)
- **Tags:** [CWE-1025](https://agentprime.io/advisories/tag/cwe-1025.md)
- **Published:** 29 Oct 2026
- **Updated:** 29 Oct 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 29 Oct 2026, 16:37 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `org.keycloak:keycloak-services` (Maven): affected `<26.6.4`; fixed in `26.6.4`
- `org.keycloak:keycloak-policy-enforcer` (Maven): affected `<26.0.10`; fixed in `26.0.10`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> Keycloak versions before 26.6.4 (keycloak-services) and before 26.0.10 (keycloak-policy-enforcer) are affected. An authenticated user can bypass authorization policies, including role, scope, and UMA permission checks, by including the configured access-denied page path in a request URL, gaining unauthorized access to protected resources. Upgrade keycloak-services to 26.6.4 or keycloak-policy-enforcer to 26.0.10.

Written 2 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 8.1 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N`, from CNA (redhat)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0065, the 51st percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:16 UTC: First seen by agentprime
- 31 Oct 2026, 14:16 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-f5p5-6xmx-p252)

## Sources

- [GitHub Advisory Database: GHSA-f5p5-6xmx-p252](https://github.com/advisories/GHSA-f5p5-6xmx-p252)
- [OSV: GHSA-f5p5-6xmx-p252](https://osv.dev/vulnerability/GHSA-f5p5-6xmx-p252)
- <https://github.com/keycloak/keycloak/security/advisories/GHSA-f5p5-6xmx-p252>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-9800>
- <https://access.redhat.com/errata/RHSA-2026:30049>
- <https://access.redhat.com/errata/RHSA-2026:30050>
- <https://access.redhat.com/errata/RHSA-2026:30083>
- <https://access.redhat.com/errata/RHSA-2026:30084>
- <https://access.redhat.com/errata/RHSA-2026:36002>
- <https://access.redhat.com/errata/RHSA-2026:36013>
- <https://access.redhat.com/errata/RHSA-2026:50846>
- <https://access.redhat.com/errata/RHSA-2026:50847>
- <https://access.redhat.com/security/cve/CVE-2026-9800>
- <https://bugzilla.redhat.com/show_bug.cgi?id=2482472>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-f5p5-6xmx-p252>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-f5p5-6xmx-p252/>. Everything for agents: <https://agentprime.io/llms.txt>.