CVE-2026-85511 Wildfly-elytron-realm-token: parameter injection in eap's elytron oauth2
Medium 4.2
Published
Updated
Check this codebase for CVE-2026-85511 and fix it if it is affected.
What it is: CVE-2026-85511 is a medium-severity vulnerability in Red Hat Data Grid 8, published on 18 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-85511 in the wild and no public exploit code.
Affected product: Red Hat Data Grid 8. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2026-85511/ (Markdown: https://insights.sbomify.com/CVE-2026-85511/index.md)
Attackers can bypass OAuth2 introspection checks via parameter injection in Elytron token realms due to missing URL encoding.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-85511?
CVE-2026-85511 is a medium-severity vulnerability in Red Hat Data Grid 8, published on 18 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A flaw was found in EAP's Elytron. An EAP application whose security domain is backed by an Elytron token-realm with oauth2-introspection would allow parameter substitution due to missing URL encoding.
Weakness: CWE-290
Which versions are affected by CVE-2026-85511?
How do I fix CVE-2026-85511?
Apply the vendor's patch.
Is CVE-2026-85511 being exploited?
There is no known exploitation of CVE-2026-85511 in the wild and no public exploit code.
Sources
Also known as GHSA-mp6j-4f9f-mcr2.