Arbitrary File Upload Affecting code16/sharp package, versions <9.20.0
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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Test your applications- Snyk IDSNYK-PHP-CODE16SHARP-15789881
- published27 Mar 2026
- disclosed27 Mar 2026
- creditzaurgsynv
Introduced: 27 Mar 2026
CVE-2026-33687 (opens in a new tab)How to fix?
Upgrade code16/sharp to version 9.20.0 or higher.
Overview
Affected versions of this package are vulnerable to Arbitrary File Upload via the ApiFormUploadController function. An attacker can upload arbitrary files by manipulating the validation_rule parameter to bypass all file type and extension restrictions.
Note:
This is only exploitable if the storage disk for uploads is configured as public, allowing direct access or execution of uploaded files.
Workaround
This vulnerability can be mitigated by ensuring the storage disk used for uploads is strictly private.