Add vpatch-CVE-2026-34910 rule and test

.appsec-tests/vpatch-CVE-2026-34910/CVE-2026-34910.yaml

@@ -0,0 +1,19 @@
+## autogenerated on 2026-09-16 13:23:17
+id: CVE-2026-34910
+info:
+  name: CVE-2026-34910
+  author: crowdsec
+  severity: info
+  description: CVE-2026-34910 testing
+  tags: appsec-testing
+http:
+  - raw:
+      - |
+        GET /api/auth/validate-sso/..%2f..%2f..%2fproxy/users/api/v2/ucs/update/latest_package?pkg_name=%3b+nslookup+{{interactsh-url}}+%3b HTTP/1.1
+        Host: {{Hostname}}
+
+    cookie-reuse: true
+    matchers:
+      - type: status
+        status:
+          - 403

.appsec-tests/vpatch-CVE-2026-34910/config.yaml

@@ -0,0 +1,5 @@
+## autogenerated on 2026-09-16 13:23:17
+appsec-rules:
+  - ./appsec-rules/crowdsecurity/base-config.yaml
+  - ./appsec-rules/crowdsecurity/vpatch-CVE-2026-34910.yaml
+nuclei_template: CVE-2026-34910.yaml

appsec-rules/crowdsecurity/vpatch-CVE-2026-34910.yaml

@@ -0,0 +1,35 @@
+## autogenerated on 2026-09-16 13:23:17
+name: crowdsecurity/vpatch-CVE-2026-34910
+description: 'Detects command injection in UniFi OS through the package update endpoint and the pkg_name parameter.'
+rules:
+  - and:
+      - zones:
+          - URI
+        transform:
+          - urldecode
+          - lowercase
+        match:
+          type: contains
+          value: '/proxy/users/api/v2/ucs/update/latest_package'
+      - zones:
+          - ARGS
+        variables:
+          - pkg_name
+        transform:
+          - urldecode
+          - lowercase
+        match:
+          type: contains
+          value: ';'
+
+labels:
+  type: exploit
+  service: http
+  confidence: 3
+  spoofable: 0
+  behavior: 'http:exploit'
+  label: 'UniFi Os - RCE'
+  classification:
+    - cve.CVE-2026-34910
+    - attack.T1059
+    - cwe.CWE-78

collections/crowdsecurity/appsec-virtual-patching.yaml

@@ -144,6 +144,7 @@ appsec-rules:
 - crowdsecurity/vpatch-CVE-2025-61882
 - crowdsecurity/vpatch-CVE-2025-27223
 - crowdsecurity/vpatch-CVE-2023-3169
+- crowdsecurity/vpatch-CVE-2026-34910
 - crowdsecurity/vpatch-CVE-2019-18952
 - crowdsecurity/vpatch-CVE-2025-54249
 - crowdsecurity/vpatch-CVE-2020-13640