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Fencer Intel
medium 5.4

GHSA-52cw-pvq9-9m5v json

Silverstripe uses TinyMCE which allows svg files linked in object tags

published 2y ago modified last yr.

cvss
5.4
version 3.1, GitHub
cisa kev
Not listed
not in CISA's catalog
epss
—
no score, EPSS covers CVEs only
public exploits
0
none known

Summary

### 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: - https://www.silverstripe.org/download/security-releases/ss-2024-001 - https://github.com/advisories/GHSA-5359-pvf2-pw78

Patch / fix

  • packagist silverstripe/framework 5.2.16

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CVSS scores

assigned by version score vector
GitHub 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
packagist silverstripe/framework
<5.2.16
5.2.16

Classification

Weakness
  • CWE-1395 Dependency on Vulnerable Third-Party Component
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.