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EUVD-2026-318640

fkie_cve-2026-27886

Strapi is an open source headless content management system. Strapi versions starting in 4.0.0 and prior to 5.37.0 did not sufficiently sanitize query parameters when filtering content via relational fields. An unauthenticated attacker could use the `where` query parameter on any publicly-accessible content-type with an `updatedBy` (or other admin-relation) field to perform a boolean-oracle attack against private fields on the joined `admin_users` table, including the `resetPasswordToken` field. Extracting an admin reset token via this oracle made full administrative account takeover possible without authentication. When a filter such as `where[updatedBy][resetPasswordToken][$startsWith]=a` was applied to a public Content API endpoint, the underlying query generation performed a `LEFT JOIN` against the `admin_users` table and emitted a `WHERE` clause referencing the joined column. The query parameter sanitization layer did not block operator chains that traversed into relational target schemas the caller had no read permission on, allowing the response count to be used as a one-bit oracle on any admin-table field. The patch in version 5.37.0 introduces explicit query-parameter sanitization at the controller and service boundary via three new primitives: `strictParam`, `addQueryParams`, and `addBodyParams`. Operator chains that traverse into restricted relational targets are now rejected before reaching the database.

GHSA-rjg2-95x7-8qmx — Strapi may leak sensitive data via relational filtering due to lack of query sanitization

Affected: npm: @strapi/strapi

### Summary of CVE-2026-27886 Vulnerability Details

- CVE: CVE-2026-27886 - CVSS v3.1 Vector: `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N` (9.3 — Critical) - Affected Versions: `@strapi/strapi` <=5.36.1 - How to Patch: Immediately update your Strapi to >=5.37.0

### Description of CVE-2026-27886

Strapi versions prior to 5.37.0 did not sufficiently sanitize query parameters when filtering content via relational fields. An unauthenticated attacker could use the `where` query parameter on any publicly-accessible content-type with an `updatedBy` (or other admin-relation) field to perform a boolean-oracle attack against private fields on the joined `admin_users` table, including the `resetPasswordToken` field. Extracting an admin reset token via this oracle made full administrative account takeover possible without authentication.

When a filter such as `where[updatedBy][resetPasswordToken][$startsWith]=a` was applied to a public Content API endpoint, the underlying query generation performed a `LEFT JOIN` against the `admin_users` table and emitted a `WHERE` clause referencing the joined column. The query parameter sanitization layer did not block operator chains that traversed into relational target schemas the caller had no read permission on, allowing the response count to be used as a one-bit oracle on any admin-table field.

The patch introduces explicit query-parameter sanitization at the controller and service boundary via three new primitives: `str…

WID-SEC-W-2026-1552 — Strapi: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Strapi ausnutzen, um einen Denial-of-Service-Zustand herbeizuführen, Administratorrechte zu erlangen, Daten zu manipulieren, vertrauliche Informationen offenzulegen oder Sicherheitsmaßnahmen zu umgehen.