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GHSA-rjg2-95x7-8qmx
No affected components available
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: strictParam, addQueryParams, and addBodyParams. Operator chains that traverse into restricted relational targets are now rejected before reaching the database.
IoC's for CVE-2026-27886
Indicators that an instance running an unpatched version may have been exploited:
- Server access logs containing query strings traversing into admin-relation private fields. Regex:
\?(.*&)?where\[(updatedBy|createdBy|publishedBy)\]\[(email|password|resetPasswordToken|confirmationToken|firstname|lastname|preferedLanguage)\]\[\$(startsWith|contains|eq|gt|lt|ge|le|in|notIn|notNull|null)\]= - High volume of public Content API requests from a single IP iterating through a hex alphabet (
0-9,a-f) on the same content-type endpoint with progressively-longer filter values - Subsequent
POST /admin/reset-passwordcalls using a reset token that the legitimate admin did not request - Successful admin password change immediately following a burst of public Content API requests with
where[updatedBy]query parameters - Sustained burst of identical-shape requests with only the trailing character of the filter value varying
Credit
Discovered by: James Doll - WildWest CyberSecurity Contact: cve+2026-27886@wildwestcyber.com Website: https://wildwestcyber.com LinkedIn: https://www.linkedin.com/in/james-doll-273a61243
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability.
Exploitation activity has been observed. Apply available patches or mitigations urgently.
Probability that this vulnerability will be exploited in the wild within the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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