CVE-2026-123542 OpenAM before 16.1.4 PKCE Bypass in OAuth 2.0 Device Authorization Flow
High 7.6
Published
Updated
Check this codebase for CVE-2026-123542 and fix it if it is affected.
What it is: CVE-2026-123542 is a high-severity vulnerability in OpenIdentityPlatform OpenAM, published on 8 Nov 2026.
Exploitation: There is no known exploitation of CVE-2026-123542 in the wild and no public exploit code.
Affected product: OpenIdentityPlatform OpenAM. 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-2026-123542/ (Markdown: https://insights.sbomify.com/CVE-2026-123542/index.md)
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-123542?
CVE-2026-123542 is a high-severity vulnerability in OpenIdentityPlatform OpenAM, published on 8 Nov 2026.
Official description
OpenAM before 16.1.4 fails to enforce PKCE in the OAuth 2.0 device authorization flow, never validating the code verifier when device codes are exchanged for tokens. Attackers who obtain an approved device code from client logs or shared device storage can redeem it for access and ID tokens to impersonate the user.
Weakness: CWE-358
Which versions are affected by CVE-2026-123542?
How do I fix CVE-2026-123542?
No fix has been published for CVE-2026-123542 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-123542 being exploited?
There is no known exploitation of CVE-2026-123542 in the wild and no public exploit code.
Sources
Also known as GHSA-2j6x-v2h7-284v, GHSA-h93p-35jm-rj83.