From 33979b76eb68550529e36c679d5743de6db2320c Mon Sep 17 00:00:00 2001
From: crowdsec-automation
 <63358111+crowdsec-automation@users.noreply.github.com>
Date: Mon, 15 Jun 2026 11:58:39 +0200
Subject: [PATCH 1/4] Add vpatch-CVE-2026-20253 rule

---
 .../crowdsecurity/vpatch-CVE-2026-20253.yaml  | 25 +++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 appsec-rules/crowdsecurity/vpatch-CVE-2026-20253.yaml

diff --git a/appsec-rules/crowdsecurity/vpatch-CVE-2026-20253.yaml b/appsec-rules/crowdsecurity/vpatch-CVE-2026-20253.yaml
new file mode 100644
index 00000000000..18634bbe438
--- /dev/null
+++ b/appsec-rules/crowdsecurity/vpatch-CVE-2026-20253.yaml
@@ -0,0 +1,25 @@
+## autogenerated on 2026-06-15 09:58:35
+name: crowdsecurity/vpatch-CVE-2026-20253
+description: 'Detects unauthenticated file upload/truncation via Splunk PostgreSQL sidecar backup endpoint.'
+rules:
+  - and:
+      - zones:
+          - URI
+        transform:
+          - lowercase
+          - urldecode
+        match:
+          type: contains
+          value: /splunkd/__raw/v1/postgres/recovery/backup
+
+labels:
+  type: exploit
+  service: http
+  confidence: 3
+  spoofable: 0
+  behavior: 'http:exploit'
+  label: 'Splunk - Unrestricted File Upload'
+  classification:
+    - cve.CVE-2026-20253
+    - attack.T1190
+    - cwe.CWE-434

From 6570a669e7afaa1a0116263cb2d30a7aed780ed6 Mon Sep 17 00:00:00 2001
From: crowdsec-automation
 <63358111+crowdsec-automation@users.noreply.github.com>
Date: Mon, 15 Jun 2026 11:58:41 +0200
Subject: [PATCH 2/4] Add vpatch-CVE-2026-20253 test config

---
 .appsec-tests/vpatch-CVE-2026-20253/config.yaml | 5 +++++
 1 file changed, 5 insertions(+)
 create mode 100644 .appsec-tests/vpatch-CVE-2026-20253/config.yaml

diff --git a/.appsec-tests/vpatch-CVE-2026-20253/config.yaml b/.appsec-tests/vpatch-CVE-2026-20253/config.yaml
new file mode 100644
index 00000000000..c9c7a7f68b3
--- /dev/null
+++ b/.appsec-tests/vpatch-CVE-2026-20253/config.yaml
@@ -0,0 +1,5 @@
+## autogenerated on 2026-06-15 09:58:35
+appsec-rules:
+  - ./appsec-rules/crowdsecurity/base-config.yaml
+  - ./appsec-rules/crowdsecurity/vpatch-CVE-2026-20253.yaml
+nuclei_template: CVE-2026-20253.yaml

From e59e6fa8d3914dd17fd46318e76c91fe0b273107 Mon Sep 17 00:00:00 2001
From: crowdsec-automation
 <63358111+crowdsec-automation@users.noreply.github.com>
Date: Mon, 15 Jun 2026 11:58:43 +0200
Subject: [PATCH 3/4] Add CVE-2026-20253.yaml test

---
 .../vpatch-CVE-2026-20253/CVE-2026-20253.yaml | 20 +++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 .appsec-tests/vpatch-CVE-2026-20253/CVE-2026-20253.yaml

diff --git a/.appsec-tests/vpatch-CVE-2026-20253/CVE-2026-20253.yaml b/.appsec-tests/vpatch-CVE-2026-20253/CVE-2026-20253.yaml
new file mode 100644
index 00000000000..0e03577db22
--- /dev/null
+++ b/.appsec-tests/vpatch-CVE-2026-20253/CVE-2026-20253.yaml
@@ -0,0 +1,20 @@
+## autogenerated on 2026-06-15 09:58:35
+id: CVE-2026-20253
+info:
+  name: CVE-2026-20253
+  author: crowdsec
+  severity: info
+  description: CVE-2026-20253 testing
+  tags: appsec-testing
+http:
+  - raw:
+      - |
+        POST /en-US/splunkd/__raw/v1/postgres/recovery/backup HTTP/1.1
+        Host: {{Hostname}}
+        Authorization: Basic ZGFnOg==
+
+    cookie-reuse: true
+    matchers:
+    - type: status
+      status:
+       - 403

From 65b2b03b13324a95c86a6b7c2c1697ba320915d0 Mon Sep 17 00:00:00 2001
From: crowdsec-automation
 <63358111+crowdsec-automation@users.noreply.github.com>
Date: Mon, 15 Jun 2026 11:58:45 +0200
Subject: [PATCH 4/4] Add vpatch-CVE-2026-20253 rule to vpatch collection

---
 collections/crowdsecurity/appsec-virtual-patching.yaml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/collections/crowdsecurity/appsec-virtual-patching.yaml b/collections/crowdsecurity/appsec-virtual-patching.yaml
index c4f95a425d8..73214f91b68 100644
--- a/collections/crowdsecurity/appsec-virtual-patching.yaml
+++ b/collections/crowdsecurity/appsec-virtual-patching.yaml
@@ -48,6 +48,7 @@ appsec-rules:
 - crowdsecurity/vpatch-CVE-2023-35078
 - crowdsecurity/vpatch-CVE-2023-35082
 - crowdsecurity/vpatch-CVE-2023-24000
+- crowdsecurity/vpatch-CVE-2026-20253
 - crowdsecurity/vpatch-CVE-2022-22954
 - crowdsecurity/vpatch-CVE-2024-1212
 - crowdsecurity/vpatch-symfony-profiler