# CVE-2026-39322: PolarLearn: Any password authenticates banned accounts and grants API access

> Attackers can authenticate banned accounts with any password to access API routes, allowing unauthorized data access and actions.

- **Severity:** Critical 9.2 (`CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/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:** 7 Apr 2026
- **Updated:** 9 Apr 2026

## What is CVE-2026-39322?

CVE-2026-39322 is a critical authentication bypass vulnerability in polarnl PolarLearn, published on 7 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

PolarLearn is a free and open-source learning program. In 0-PRERELEASE-15 and earlier, POST /api/v1/auth/sign-in creates a valid session for banned accounts before verifying the supplied password. That session is then accepted across authenticated /api routes, enabling account data access and authenticated actions as the banned user.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2026-39322?

It affects 1 product.


Products: Polarlearn Polarlearn.

## How do I fix CVE-2026-39322?

No fix has been published for CVE-2026-39322 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-39322 being exploited?

There is no known exploitation of CVE-2026-39322 in the wild and no public exploit code.

## Other vulnerabilities in polarnl PolarLearn

- [CVE-2026-25885](https://insights.sbomify.com/CVE-2026-25885/): PolarLearn allows Unauthenticated WebSocket access allows subscribing to and posting in arbitrary group chats (critical 10.0)
- [CVE-2026-35610](https://insights.sbomify.com/CVE-2026-35610/): PolarLearn has a Server Action Admin Bypass in Account Management Actions (high 8.8)
- [CVE-2026-25126](https://insights.sbomify.com/CVE-2026-25126/): PolarLearn's unvalidated vote direction allows vote count manipulation (high 7.1)
- [CVE-2026-25222](https://insights.sbomify.com/CVE-2026-25222/): PolarLearn Affected by User Enumeration via Argon2 Timing Attack on Sign-In Endpoint (medium 6.3)
- [CVE-2026-25221](https://insights.sbomify.com/CVE-2026-25221/): PolarLearn has Multiple Login CSRFs via Missing OAuth state Parameter (GitHub & Google) (low 2.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-39322 and fix it if it is affected.

What it is: CVE-2026-39322 is a critical authentication bypass vulnerability in polarnl PolarLearn, published on 7 Apr 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-2026-39322 in the wild and no public exploit code.

Affected product: polarnl PolarLearn. 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-2026-39322/ (Markdown: https://insights.sbomify.com/CVE-2026-39322/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-39322
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-39322
- OSV: https://osv.dev/vulnerability/CVE-2026-39322

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-39322/
Summaries are generated and may contain mistakes; the official description above is the record.