CVE-2023-41339
HIGHCVE-2023-41339 is a high-severity (CVSS 8.6) Server-Side Request Forgery (SSRF) vulnerability in org.geoserver:gs-wms. O3 Security confirms whether CVE-2023-41339 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Unsecured WMS dynamic styling sld=<url> parameter affords blind unauthenticated SSRF in GeoServer
Blast Radius
org.geoserver:gs-wms☕org.geoserver:gs-wms☕org.geoserver.web:gs-web-app☕org.geoserver.web:gs-web-appReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.
Description
GeoServer is an open source software server written in Java that allows users to share and edit geospatial data. The WMS specification defines an sld=<url> parameter for GetMap, GetLegendGraphic and GetFeatureInfo operations for user supplied "dynamic styling". Enabling the use of dynamic styles, without also configuring URL checks, provides the opportunity for Service Side Request Forgery. This vulnerability can be used to steal user NetNTLMv2 hashes which could be relayed or cracked externally to gain further access. This vulnerability has been patched in versions 2.22.5 and 2.23.2.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| ☕Maven | org.geoserver:gs-wms | all versions | 2.22.5 |
| ☕Maven | org.geoserver:gs-wms | ≥ 2.23.0&&< 2.23.2 | 2.23.2 |
| ☕Maven | org.geoserver.web:gs-web-app | all versions | 2.22.5 |
| ☕Maven | org.geoserver.web:gs-web-app | ≥ 2.23.0&&< 2.23.2 | 2.23.2 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.geoserver:gs-wms. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update org.geoserver:gs-wms to 2.22.5 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-41339 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether CVE-2023-41339 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to CVE-2023-41339. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is CVE-2023-41339 in your dependencies?
O3 detects CVE-2023-41339 across Maven dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.