keycloak-core: open redirect via "form_post.jwt" JARM response mode
An incomplete fix was found in Keycloak Core patch. An attacker can steal authorization codes or tokens from clients using a wildcard in the JARM response mode "form_post.jwt". It is observed that changing the response_mode parameter in the original proof of concept from "form_post" to "form_post.jwt" can bypass the security patch implemented to address CVE-2023-6134.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | org.keycloak:keycloak-core | < 23.0.4 | 23.0.4 |
References
- https://github.com/keycloak/keycloak/security/advisories/GHSA-9vm7-v8wj-3fqw
- https://nvd.nist.gov/vuln/detail/CVE-2023-6927
- https://access.redhat.com/errata/RHSA-2024:0094
- https://access.redhat.com/errata/RHSA-2024:0095
- https://access.redhat.com/errata/RHSA-2024:0096
- https://access.redhat.com/errata/RHSA-2024:0097
- https://access.redhat.com/errata/RHSA-2024:0098
- https://access.redhat.com/errata/RHSA-2024:0100
- https://access.redhat.com/errata/RHSA-2024:0101
- https://access.redhat.com/security/cve/CVE-2023-6927
- https://bugzilla.redhat.com/show_bug.cgi?id=2255027
- https://github.com/keycloak/keycloak
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N- Weakness (CWE)
CWE-601- Platform
- Java / Kotlin (Maven)
- Package
org.keycloak:keycloak-core- Disclosed
- 23.01.2024
- Updated
- 11.10.2026 13:20
Sources and licenses
OSV / GitHub Advisory Database - GHSA-9vm7-v8wj-3fqw - CC BY 4.0
Vulnerability history: org.keycloak:keycloak-core
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 49
- First → latest
- 10.2018 02.2025
- Without a fix
- 5
- Exploited in attacks
- 0
Severity breakdown
- Critical 3
- High 14
- Medium 31
- Low 1
Disclosures per year
- 2018: 9
- 2019: 4
- 2020: 4
- 2021: 5
- 2022: 17
- 2023: 4
- 2024: 5
- 2025: 1
- 2026: 0
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