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MEDIUM severity

Silverstripe uses TinyMCE which allows svg files linked in object tagsGHSA-52cw-pvq9-9m5v

MEDIUM

GHSA-52cw-pvq9-9m5v is a medium-severity (CVSS 5.4) vulnerability in silverstripe/framework. A fix is available for silverstripe/framework — see the affected versions and patch details below.

Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Dec 1, 2024 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected
🐘silverstripe/framework

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

Impact

TinyMCE v6 has a configuration value convert_unsafe_embeds set to false which allows svg files containing javascript to be used in <object> or <embed> tags, which can be used as a vector for XSS attacks.

Note that <embed> tags are not allowed by default.

After patching the default value of convert_unsafe_embeds will be set to true. This means that <object> tags will be converted to iframes instead the next time the page is saved, which may break any pages that rely upon previously saved <object> tags. Developers can override this configuration if desired to revert to the original behaviour.

We reviewed the potential impact of this vulnerability within the context of Silverstripe CMS. We concluded this is a medium impact vulnerability given how TinyMCE is used by Silverstripe CMS.

References:

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistsilverstripe/frameworkall versions5.2.16composer require silverstripe/framework:^5.2.16

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for silverstripe/framework, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update silverstripe/framework to 5.2.16 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-52cw-pvq9-9m5v is resolved across your whole dependency graph.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

### Impact TinyMCE v6 has a configuration value `convert_unsafe_embeds` set to `false` which allows svg files containing javascript to be used in `<object>` or `<embed>` tags, which can be used as a vector for XSS attacks. Note that `<embed>` tags are not allowed by default. After patching the default value of `convert_unsafe_embeds` will be set to `true`. This means that `<object>` tags will be converted to iframes instead the next time the page is saved, which may break any pages that rely upon previously saved `<object>` tags. Developers can override this configuration if desired to rever
O3 Security · Impact-Aware SCA

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Silverstripe uses TinyMCE which allows svg files linked in…