# CVE-2026-94379: MISP: HTTP Method Bypass of Login Security Controls (Bruteforce Protection and Email OTP)

> Attackers can bypass brute-force protection and email OTP by using non-standard HTTP methods, enabling credential guessing and unauthorized access.

- **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:** 21 Sep 2026
- **Updated:** 21 Sep 2026
- **Also known as:** GHSA-3q8c-466v-vgx3

## What is CVE-2026-94379?

CVE-2026-94379 is a medium-severity authentication bypass vulnerability in MISP, published on 21 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The login() function in MISP's UsersController.php contained insufficient HTTP method validation for several security-critical code paths. The original code used an allowlist approach, checking only for specific HTTP methods (POST and PUT) before enforcing bruteforce protection, email one-time-password (OTP) verification, and login-failure logging. Because the checks were not exhaustive, an unauthenticated attacker could issue login requests using other HTTP methods and bypass all three security controls simultaneously. Specifically: 

 - the bruteforce blocklisting check and attempt counter were skipped, allowing unlimited credential-guessing attempts without being rate-limited or blocked
 -  the email OTP two-factor authentication step was skipped, defeating the second factor of authentication
 - login-failure events were neither logged nor counted, removing the audit trail and the mechanism that would normally trigger a blocklist entry.

The security impact is the effective disabling of brute-force protection and multi-factor authentication for any attacker who can craft an HTTP request with a non-POST/PUT method to the login endpoint, potentially leading to credential compromise and unauthorized access to the MISP instance.

Version affected: <2.5.47

Weakness: CWE-285 (Improper Authorization), CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2026-94379?


## How do I fix CVE-2026-94379?

No fix has been published for CVE-2026-94379 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-94379 being exploited?

There is no known exploitation of CVE-2026-94379 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-94379 and fix it if it is affected.

What it is: CVE-2026-94379 is a medium-severity authentication bypass vulnerability in MISP, published on 21 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-2026-94379 in the wild and no public exploit code.

Affected product: MISP. 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-2026-94379/ (Markdown: https://insights.sbomify.com/CVE-2026-94379/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-94379
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-94379
- OSV: https://osv.dev/vulnerability/CVE-2026-94379

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-94379/
Summaries are generated and may contain mistakes; the official description above is the record.