Vulnerability · Published Oct 19, 2026 · Assigned by apache
CVE-2026-85301Apache Camel: Camel-Keycloak Issuer Validation Bypass When the Introspection Response Omits the iss Claim
Medium 4.8
In plain English
A medium-severity improper authentication in Apache Camel from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.
Official description
Improper Authentication vulnerability in Apache Camel Keycloak component. This issue affects Apache Camel: from 4.15.0 before 4.18.5, from 4.19.0 before 4.22.1. The security processor validated the issuer of an introspected token only when the introspection response actually carried an iss claim. When the claim was absent the check was skipped rather than treated as a failure, so a token that the configured issuer did not mint could be accepted provided the introspection endpoint answered without naming an issuer. Reaching this requires an introspection endpoint that omits iss and accepts tokens from more than one issuer, which is not the default Keycloak arrangement, hence the low severity; where that arrangement exists the consequence is that the deployment authenticates a caller it should have rejected. Upgrade to Apache Camel 4.23.0, which fixes the issue. Users on the 4.18.x LTS releases stream should upgrade to 4.18.5. Users on the 4.22.x LTS releases stream should upgrade to 4.22.1. An absent iss claim is now treated as a validation failure rather than as a reason to skip the check. For deployments that cannot upgrade immediately, ensure the introspection endpoint returns the iss claim, and that it serves exactly one issuer.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache Camel | 4.15.0 – before 4.18.54.19.0 – before 4.22.1 |
Weakness: CWE-287 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
References
- Apache Camel Security Advisory - CVE-2026-85301 vendor-advisory
- CAMEL-24448 issue-tracking
- Fix on main, released in 4.23.0 (commit ee074873e92dde749aa183d26205b92ddc9bde2a) patch
- Backport to camel-4.22.x, released in 4.22.1 (commit c9e69aae7b374cc38d28c1c8dca744c1ba4d6718) patch
- Backport to camel-4.18.x, released in 4.18.5 (commit aba0f7551e4f63e1f37498454870a49ccdaae727) patch