GHSA-7cj5-v4pp-v632
LibreNMS: Stored XSS via graph_descr admin config settings echoed without escaping to all authenticated users
Summary
### Summary The `graph_descr. ` family of settings is echoed verbatim without `htmlspecialchars()` in `includes/html/pages/graphs.inc.php:194`. Any admin can store a malicious HTML payload that executes in every authenticated user's browser viewing that graph type. ### CVSS `CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N` — **4.8 Medium** ### Details ```php // graphs.inc.php:194 echo LibrenmsConfig::get('graph_descr.' . $vars['type']); ``` ### PoC ``` PUT /settings/graph_descr.device_processor {"value": " "} GET /graphs?type=device_processor → ``` ### Fix ```php echo htmlspecialchars(LibrenmsConfig::get('graph_descr.' . $vars['type']), ENT_QUOTES, 'UTF-8'); ``` ### Prerequisite Admin session to set the config value.
Affected packages
| Ecosystem | Package | Affected versions | Fixed versions |
|---|---|---|---|
| Packagist | librenms/librenms | — | 26.7.0 |
Remediation: Upgrade to 26.7.0 or later.
References
Includes data from the GitHub Advisory Database, licensed under CC-BY 4.0.