Silverstripe CMS through 4.5 can be susceptible to script execution from malicious upload contents under allowed file extensions (for…

Description

Silverstripe CMS through 4.5 can be susceptible to script execution from malicious upload contents under allowed file extensions (for example HTML code in a TXT file). When these files are stored as protected or draft files, the MIME detection can cause browsers to execute the file contents. Uploads stored as protected or draft files are allowed by default for authorised users only, but can also be enabled through custom logic as well as modules such as silverstripe/userforms. Sites using the previously optional silverstripe/mimevalidator module can configure MIME whitelists rather than extension whitelists, and hence prevent this issue. Sites on the Common Web Platform (CWP) use this module by default, and are not affected.

Scores

EPSS (exploitation in 30 days)

1.8% · top 21% of all CVEs (6 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.8.

Weakness

• n/a
• CWE-434 (opens in a new tab)All about CWE-434 and its CVEs

Affected products

• n/a

  • affected n/a

Affected packages

From reviewed advisories of the GitHub Advisory Database.

• Packagistsilverstripe/cmsGHSA-h77w-655f-6j3m (opens in a new tab)

References (1)

• https://www.silverstripe.org/download/security-releases/CVE-2020-9309 (opens in a new tab)x_refsource_CONFIRMx_transferred

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisory GHSA-h77w-655f-6j3m (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2020-9309](https://trackcve.app/badge/CVE-2020-9309.svg)](https://trackcve.app/cve/CVE-2020-9309)

Record last updated 4 Aug 2024, 10:26 UTC.