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CVE-2026-57997

Strapi users-permissions - JWT Algorithm Confusion via Missing Algorithm Configuration

MEDIUM
5.4
CVSS Score
Published: June 29, 2026 at 09:16 PM UTC
Updated: October 25, 2026 at 09:10 PM UTC
1 product affected across 1 vendorStrapi

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Severity
MEDIUM5.4
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Strapi· Strapicontainer
95%
v < 5.7.0
Affected range stops below 5.7.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (4)

Issue Tracking
Source: cverecord
https://github.com/strapi/strapi/issues/26587
Issue TrackingPatch
Source: cverecord
https://github.com/strapi/strapi/pull/26752
Product
Source: cverecord
https://github.com/strapi/strapi
Third Party AdvisoryPatch
Source: cverecord
https://www.vulncheck.com/advisories/strapi-users-permissions-jwt-algorithm-confusion-via-missing-algorithm-configuration

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.4MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-327

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