Path traversal when loading stylesheets

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

• wikimedia wikimedia-extensions-css1.39.0 and later · before 1.39.9
• wikimedia wikimedia-extensions-css1.41.0 and later · before 1.41.3
• wikimedia wikimedia-extensions-css1.42.0 and later · before 1.42.2

Versions reported by the vendor

Affected version ranges reported by the assigning authority (wikimedia-foundation). Independent of NVD's CPE analysis and usually ahead of it.

• The Wikimedia Foundation Mediawiki - CSS Extension

  • 1.42.x and later · before 1.42.2affected · semver
  • 1.41.x and later · before 1.41.3affected · semver
  • 1.39.x and later · before 1.39.9affected · semver

Other highest-scoring records for the same primary product.

• CVE-2024-47845CSS sanitizer used incorrectly, and is easily bypassed
  27Monitor

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Root cause

A user-supplied file name is joined with the allowed directory, but the result is never checked to confirm it is still inside that directory.

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

1const file = path.join(ROOT, req.query.name);2res.sendFile(file);

1const file = path.resolve(ROOT, req.query.name);2if (!file.startsWith(ROOT + path.sep)) {3  return res.sendStatus(400);4}5res.sendFile(file);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.