What is CVE-2026-57997?

CVE-2026-57997 is a medium-severity vulnerability in Strapi, classified under Use of a Broken or Risky Cryptographic Algorithm. CVSS score: 4.8/10. Published 2026-06-29.

How severe is CVE-2026-57997?

Medium severity. CVSS v3 base score is 4.8 out of 10.

Vulnerability in Strapi

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.

Vulnerability class: POODLE (CVE-2014-3566)

Published 2026-06-29 · last modified 2026-07-01.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.002 (14.6th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 15th percentile — 14.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Strapi — versions 0

Weakness classification (CWE)

CWE-327 — Use of a Broken or Risky Cryptographic Algorithm

References

Pull Issue (issue-tracking, Issue Tracking)
Pull Issue (issue-tracking, Patch, patch, Issue Tracking)
Product Details (Product, product)
www.vulncheck.com/advisories/strapi-users-permissions-jwt-algorithm-confusion-v… (Patch, Third Party Advisory, third-party-advisory)

Frequently asked questions

What is CVE-2026-57997?: CVE-2026-57997 is a medium-severity vulnerability in Strapi, classified under Use of a Broken or Risky Cryptographic Algorithm. CVSS score: 4.8/10. Published 2026-06-29.
How severe is CVE-2026-57997?: Medium severity. CVSS v3 base score is 4.8 out of 10.