Backdrop CMS 1.12.x before 1.12.8 and 1.13.x before 1.13.3 doesn't sufficiently filter output when displaying certain block labels created by administrators. An attacker could potentially craft a specialized label, then have an administrator execute scripting when administering a layout. (This issue is mitigated by the attacker needing permission to create custom blocks on the site, which is typically an administrative permission.)
| Software | From | Fixed in |
|---|---|---|
| backdropcms / backdrop | 1.12.0 | 1.12.8 |
| backdropcms / backdrop | 1.13.0 | 1.13.3 |