# CVE-2026-57997 — strapi

> As of 2026-06-30, CVE-2026-57997 is a MEDIUM-severity vulnerability in strapi, CVSS v3.1 4.8, EPSS 0.1% (5.8th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-57997 as of 2026-06-30; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-06-30

## What is CVE-2026-57997?

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.

The record classifies CVE-2026-57997 under weakness class [CWE-327](https://intel.threadlinqs.com/cwe/CWE-327). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 98 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 4.8 — MEDIUM (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N`)
- **CVSS v4.0 base score:** 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`)
- **EPSS (FIRST):** 0.1% probability of exploitation in the next 30 days, higher than 5.8% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 2.6/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-06-29, last modified 2026-06-30

## Is CVE-2026-57997 being exploited?

It currently carries a trending score of 31 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **strapi**: strapi

## How to fix CVE-2026-57997

The record marks a vendor fix as available for CVE-2026-57997. Patch reference: [https://github.com/strapi/strapi/pull/26752](https://github.com/strapi/strapi/pull/26752). Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

## Threat activity tracking CVE-2026-57997

No threat campaign in the Threadlinqs corpus currently references CVE-2026-57997, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-07-01. This product uses the NVD API but is not endorsed or certified by the NVD.

**Third-party advisory**

- [vulncheck.com — third party advisory](https://www.vulncheck.com/advisories/strapi-users-permissions-jwt-algorithm-confusion-via-missing-algorithm-configuration)

**Issue tracking and product pages**

- [github.com — issue tracking](https://github.com/strapi/strapi/issues/26587)
- [github.com — issue tracking (26752)](https://github.com/strapi/strapi/pull/26752)
- [github.com — product](https://github.com/strapi/strapi)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-57997
Full detection coverage and IOCs for threats exploiting CVE-2026-57997 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp