# Keycloak affected by improper invitation token validation

Advisory record · `GHSA-hcvw-475w-8g7p`

- **Identifiers:** `GHSA-hcvw-475w-8g7p` · `CVE-2026-1529`
- **State:** Confirmed
- **Severity:** CVSS 8.1 High
- **Critical:** No
- **Weakness (CWE):** [CWE-347](https://cwe.mitre.org/data/definitions/347.html)
- **Tags:** [Weak cryptography or TLS](https://agentprime.io/advisories/tag/weak-crypto.md)
- **Published:** 9 Feb 2026
- **Updated:** 13 Feb 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 9 Feb 2026, 21:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `org.keycloak:keycloak-services` (Maven): affected `>=26.5.0, <26.5.3 || <26.2.13 || >=26.3.0, <26.4.9`; fixed in `26.5.3`, `26.2.13`, `26.4.9`

## 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:** 0.0049, the 42nd percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:21 UTC: First seen by agentprime
- 31 Oct 2026, 14:21 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-hcvw-475w-8g7p)

## Sources

- [GitHub Advisory Database: GHSA-hcvw-475w-8g7p](https://github.com/advisories/GHSA-hcvw-475w-8g7p)
- [OSV: GHSA-hcvw-475w-8g7p](https://osv.dev/vulnerability/GHSA-hcvw-475w-8g7p)
- <https://nvd.nist.gov/vuln/detail/CVE-2026-1529>
- <https://github.com/keycloak/keycloak/issues/46145>
- <https://github.com/keycloak/keycloak/pull/46155>
- <https://github.com/keycloak/keycloak/commit/82cd7941d1dd28fa14a67a6e6b912301f1a5e1a1>
- <https://github.com/keycloak/keycloak/commit/8fc9a98026106a326f4faa98d4c9a48341ace2d7>
- <https://github.com/keycloak/keycloak/commit/b2519756487b519f95c07aa8b10afe003e492119>
- <https://access.redhat.com/errata/RHSA-2026:2363>
- <https://access.redhat.com/errata/RHSA-2026:2364>
- <https://access.redhat.com/errata/RHSA-2026:2365>
- <https://access.redhat.com/errata/RHSA-2026:2366>
- <https://access.redhat.com/security/cve/CVE-2026-1529>
- <https://bugzilla.redhat.com/show_bug.cgi?id=2433783>

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-hcvw-475w-8g7p>, 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-hcvw-475w-8g7p/>. Everything for agents: <https://agentprime.io/llms.txt>.