# CVE-2026-89027: miniOrange JWT Authentication for WP REST APIs < 4.8.0 Authentication Downgrade

> Unauthenticated attackers can bypass configured JWT authentication to force Basic HTTP auth, enabling unthrottled username enumeration and credential guessing.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 15 Sep 2026
- **Updated:** 17 Sep 2026
- **Also known as:** GHSA-j3j9-5wcv-qwj3

## What is CVE-2026-89027?

CVE-2026-89027 is a medium-severity authentication bypass vulnerability in miniOrange JWT Authentication for WP REST APIs, published on 15 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

miniOrange JWT Authentication for WP REST APIs plugin for WordPress before 4.8.0 contains an authentication method downgrade vulnerability that allows unauthenticated attackers to bypass administrator-configured authentication by supplying a specific GET parameter without any capability check or nonce verification. Attackers can force the plugin to use Basic HTTP authentication regardless of configured JWT or API token settings, then exploit distinguishable error codes and the absence of rate limiting to perform unthrottled username enumeration and credential guessing attacks.

Weakness: CWE-306 (Missing Authentication for Critical Functionality)

## Which versions are affected by CVE-2026-89027?


## How do I fix CVE-2026-89027?

No fix has been published for CVE-2026-89027 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-89027 being exploited?

There is no known exploitation of CVE-2026-89027 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-89027 and fix it if it is affected.

What it is: CVE-2026-89027 is a medium-severity authentication bypass vulnerability in miniOrange JWT Authentication for WP REST APIs, published on 15 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-89027 in the wild and no public exploit code.

Affected product: miniOrange JWT Authentication for WP REST APIs. 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-2026-89027/ (Markdown: https://insights.sbomify.com/CVE-2026-89027/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-89027
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-89027
- OSV: https://osv.dev/vulnerability/CVE-2026-89027

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-89027/
Summaries are generated and may contain mistakes; the official description above is the record.