Missing Authorization Affecting drupal/core package, versions <10.6.13>=11.0.0-alpha1, <11.3.14>=11.4.0, <11.4.4
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published11 Sept 2026
- disclosed14 Jul 2026
- creditoffensive-ai
Introduced: 14 Jul 2026
CVE-2026-15916 (opens in a new tab)How to fix?
Upgrade drupal/core to version 10.6.13, 11.3.14, 11.4.4 or higher.
Overview
drupal/core is an an open source content management platform powering millions of websites and applications.
Affected versions of this package are vulnerable to Missing Authorization in the deliver() method of ImageStyleDownloadController (Image module), which classified any scheme other than private:// as public ($is_public = ($scheme !== 'private')) instead of checking the derivative scheme against the actual public schemes. An attacker can retrieve non-public image style derivatives without the intended access check by requesting derivatives served through a file stream that is neither public nor private. This requires the site to use a contributed file scheme with a custom stream wrapper serving private derived images, which the advisory rates as theoretical and uncommon.