MongoDB PHP Library GridFS query-operator injection in file IDs

Severity: high · CVSS 8.3 · Published 2026-09-10

The MongoDB PHP Library's GridFS component improperly handles file identifiers, allowing authenticated users to inject query operators. This can lead to unauthorized access to stored files, deletion of file chunks, or unintended file renaming. Applications storing sensitive documents via GridFS could face data breaches or data loss.

Technologies: MongoDB PHP Library, mongodb/mongodb (Packagist). Vendors: MongoDB, Packagist.

Quick answers

Is This vulnerability exploited in the wild?
No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.
How severe is This vulnerability?
High severity, with a CVSS score of 8.3, published 10 September 2026.
Which products and versions are affected?
MongoDB PHP Library 1.1.0 through 1.21.4; mongodb/mongodb (Packagist) >= 1.1.0, < 1.21.5.
Is there a fix for This vulnerability?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is This vulnerability attacked?
It is attacked over the network, in a software library.
Am I affected?
Check whether you run MongoDB PHP Library or mongodb/mongodb (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

Improper neutralization of special elements in GridFS query logic allows authenticated attackers to pass structured identifiers that are interpreted as query conditions rather than literals (CWE-943). The vulnerability affects operations including file retrieval, deletion, and renaming. An attacker can read files beyond the intended target, delete all chunks in a bucket, or rename arbitrary files.

Affected products

  • MongoDB MongoDB PHP Library 1.1.0 through 1.21.4

Timeline

  • 2026-09-10: disclosed
  • 2026-10-05: advisory

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.