CVE-2026-57997

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.

CVSS v3.1 Score

4.8

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

EPSS — Exploit Prediction

0.0015

Probability of exploitation

0.04%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-327 CWE-327

Affected Products

Vendor	Product	Versions
strapi	strapi	< 5.7.0

References

Advisories & Patches

https://github.com/strapi/strapi/pull/26752 https://www.vulncheck.com/advisories/strapi-users-permissions-jwt-algorithm-confusion-via-missing-algorithm-configuration

Other References

https://github.com/strapi/strapi https://github.com/strapi/strapi/issues/26587

Frequently Asked Questions

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. It has a CVSS v3.1 base score of 4.8 (MEDIUM).

How severe is CVE-2026-57997? +

CVE-2026-57997 has a CVSS v3.1 score of 4.8 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0015, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-57997? +

CVE-2026-57997 affects products from strapi, specifically: strapi. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-57997? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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