CVE-2023-6927 Keycloak: open redirect via "form_post.jwt" jarm response mode
Attackers can steal authorization codes or tokens via an open redirect in the JARM response mode, potentially leading to account takeover.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2023-6927?
CVE-2023-6927 is a medium-severity vulnerability in Redhat Keycloak, published on 18 Dec 2023. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
A flaw was found in Keycloak. This issue may allow an attacker to steal authorization codes or tokens from clients using a wildcard in the JARM response mode "form_post.jwt" which could be used to bypass the security patch implemented to address CVE-2023-6134.
Weakness: CWE-601
Which versions are affected by CVE-2023-6927?
2 open source packages ship an affected version, including org.keycloak:keycloak-core. It affects 2 products.
| Package | Affected | Fixed in |
|---|---|---|
org.keycloak:keycloak-core Maven | All versions | 23.0.4 |
org.keycloak:keycloak-core Maven | All versions | 23.0.4 |
Products include Redhat Keycloak, Redhat Single Sign-On.
How do I fix CVE-2023-6927?
Upgrade org.keycloak:keycloak-core to 23.0.4 or later.
Is CVE-2023-6927 being exploited?
There is no known exploitation of CVE-2023-6927 in the wild and no public exploit code.
Other vulnerabilities in Redhat Keycloak
- CVE-2022-4361 Keycloak vulnerable to cross-site scripting when validating URI-schemes on SAML and OIDC
- CVE-2022-1245 Keycloak vulnerable to privilege escalation on Token Exchange feature
- CVE-2021-20195 keycloak Self Stored Cross-site Scripting vulnerability
- CVE-2019-14910 Keycloak Authentication Error
- CVE-2019-14909 Keycloak Authentication Error
Sources
Also known as CVE-2023-6920, GHSA-9vm7-v8wj-3fqw.