# CVE-2026-57997: Strapi users-permissions - JWT Algorithm Confusion via Missing Algorithm Configuration

> Attackers with the JWT secret can bypass authentication restrictions by using non-standard HMAC algorithms if the algorithm is not explicitly configured.

- **Severity:** Medium 6.3 (`CVSS:4.0/AV:N/AC:H/AT:P/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:** 29 Jun 2026
- **Updated:** 9 Jul 2026
- **Also known as:** GHSA-93c7-w42j-xh4p

## What is CVE-2026-57997?

CVE-2026-57997 is a medium-severity vulnerability in strapi, published on 29 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Strapi users-permissions plugin fails to restrict JWT algorithms when plugin::users-permissions.jwt.algorithm is not explicitly configured, allowing acceptance of HS384 and HS512 tokens alongside HS256. Attackers possessing the jwtSecret can mint tokens with non-standard HMAC variants to bypass algorithm restrictions and weaken authentication controls.

Weakness: CWE-327 (Use of a Broken or Risky Cryptographic Algorithm)

## Which versions are affected by CVE-2026-57997?

It affects 1 product.


Products: Strapi Strapi.

## How do I fix CVE-2026-57997?

No fix has been published for CVE-2026-57997 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-57997 being exploited?

There is no known exploitation of CVE-2026-57997 in the wild and no public exploit code.

## Other vulnerabilities in strapi

- [CVE-2023-22894](https://insights.sbomify.com/CVE-2023-22894/): Strapi Cleartext Storage of Sensitive Information (high 7.2, exploited in the wild)
- [CVE-2023-22621](https://insights.sbomify.com/CVE-2023-22621/): Strapi plugins vulnerable to Server-Side Template Injection and Remote Code Execution in the Users-Permissions Plugin (critical 10.0)
- [CVE-2022-27263](https://insights.sbomify.com/CVE-2022-27263/): Unrestricted Upload of File with Dangerous Type in Strapi (critical 9.8)
- [CVE-2020-27664](https://insights.sbomify.com/CVE-2020-27664/): Authorization bypass in Strapi (critical 9.8)
- [CVE-2019-18818](https://insights.sbomify.com/CVE-2019-18818/): Strapi allows unauthenticated attacker to reset admin password without valid reset token (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-57997 and fix it if it is affected.

What it is: CVE-2026-57997 is a medium-severity vulnerability in strapi, published on 29 Jun 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-2026-57997 in the wild and no public exploit code.

Affected product: strapi. 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-2026-57997/ (Markdown: https://insights.sbomify.com/CVE-2026-57997/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-57997
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-57997
- OSV: https://osv.dev/vulnerability/CVE-2026-57997

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-57997/
Summaries are generated and may contain mistakes; the official description above is the record.