Thomsmith

**Name of the Vulnerable Software and Affected Versions** GeoServer versions prior to 2.23.3 and 2.24.0 **Description** A stored cross-site scripting (XSS) vulnerability exists that enables an authenticated administrator with workspace-level privileges to store a JavaScript payload in uploaded style/legend resources that will execute in the context of another administrator's browser when viewed in the "REST Resources API". Access to the "REST Resources API" is limited to full administrators by default and granting non-administrators access to this endpoint should be carefully considered as it may allow access to files containing sensitive information. **Recommendations** For GeoServer versions prior to 2.23.3, update to version 2.23.3 or later. For GeoServer versions prior to 2.24.0, update to version 2.24.0 or later. As a temporary workaround, consider restricting access to the "REST Resources API" to only full administrators and avoid granting non-administrators access to this endpoint. Additionally, consider disabling the upload of style/legend resources until a patch is applied.

**Name of the Vulnerable Software and Affected Versions** GeoServer versions prior to 2.22.5 GeoServer versions prior to 2.23.2 GeoServer version 2.10.3 GeoServer version 2.11.1 **Description** The issue concerns the use of dynamic styles in GeoServer, which can lead to Service Side Request Forgery. This is possible when dynamic styles are enabled without configuring URL checks, allowing an attacker to steal user NetNTLMv2 hashes. These hashes could be relayed or cracked externally to gain further access. The vulnerability can be exploited through the WMS endpoint, specifically using the `sld=<url>` parameter in GetMap, GetLegendGraphic, and GetFeatureInfo operations. **Recommendations** For GeoServer version 2.10.3 and 2.11.1, disable dynamic styling by navigating to Services > WMS Settings, locating the Dynamic styling heading, and selecting the Disable usage of SLD and SLD BODY parameters in GET requests and user styles in POST checkbox. For GeoServer versions 2.22.5 and 2.23.2, enable URL Checks by navigating to Security > URL Checks, enabling the URL Checks are enabled setting, and configuring trusted locations according to the user manual. For GeoServer version 2.24.0 and later, use of dynamic styling safely is enabled by default, so no additional actions are required.