From ea5289974795b4ebbdb539141c75e70131961674 Mon Sep 17 00:00:00 2001
From: crowdsec-automation
 <63358111+crowdsec-automation@users.noreply.github.com>
Date: Wed, 8 Apr 2026 15:19:40 +0200
Subject: [PATCH 1/4] Add vpatch-CVE-2023-29357 rule

---
 .../crowdsecurity/vpatch-CVE-2023-29357.yaml  | 42 +++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 appsec-rules/crowdsecurity/vpatch-CVE-2023-29357.yaml

diff --git a/appsec-rules/crowdsecurity/vpatch-CVE-2023-29357.yaml b/appsec-rules/crowdsecurity/vpatch-CVE-2023-29357.yaml
new file mode 100644
index 00000000000..c8c160f9e05
--- /dev/null
+++ b/appsec-rules/crowdsecurity/vpatch-CVE-2023-29357.yaml
@@ -0,0 +1,42 @@
+## autogenerated on 2026-04-08 13:19:37
+name: crowdsecurity/vpatch-CVE-2023-29357
+description: 'Detects authentication bypass in Microsoft SharePoint via forged JWT with "none" algorithm.'
+rules:
+  - and:
+      - zones:
+          - URI
+        transform:
+          - lowercase
+        match:
+          type: contains
+          value: /_api/web/siteusers
+      - zones:
+          - HEADERS
+        variables:
+          - authorization
+        transform:
+          - lowercase
+        match:
+          type: contains
+          value: 'bearer '
+      - zones:
+          - HEADERS
+        variables:
+          - authorization
+        transform:
+          - lowercase
+        match:
+          type: contains
+          value: 'none'
+
+labels:
+  type: exploit
+  service: http
+  confidence: 3
+  spoofable: 0
+  behavior: 'http:exploit'
+  label: 'Microsoft SharePoint - Authentication Bypass'
+  classification:
+    - cve.CVE-2023-29357
+    - attack.T1552
+    - cwe.CWE-287

From 07e264e3ce4a614907054d72535c0cf7b7179f6d Mon Sep 17 00:00:00 2001
From: crowdsec-automation
 <63358111+crowdsec-automation@users.noreply.github.com>
Date: Wed, 8 Apr 2026 15:19:42 +0200
Subject: [PATCH 2/4] Add vpatch-CVE-2023-29357 test config

---
 .appsec-tests/vpatch-CVE-2023-29357/config.yaml | 5 +++++
 1 file changed, 5 insertions(+)
 create mode 100644 .appsec-tests/vpatch-CVE-2023-29357/config.yaml

diff --git a/.appsec-tests/vpatch-CVE-2023-29357/config.yaml b/.appsec-tests/vpatch-CVE-2023-29357/config.yaml
new file mode 100644
index 00000000000..fe66758c014
--- /dev/null
+++ b/.appsec-tests/vpatch-CVE-2023-29357/config.yaml
@@ -0,0 +1,5 @@
+## autogenerated on 2026-04-08 13:19:37
+appsec-rules:
+  - ./appsec-rules/crowdsecurity/base-config.yaml
+  - ./appsec-rules/crowdsecurity/vpatch-CVE-2023-29357.yaml
+nuclei_template: CVE-2023-29357.yaml

From 66a7794c690f7d18e4ba401d9448b2a465ba5e25 Mon Sep 17 00:00:00 2001
From: crowdsec-automation
 <63358111+crowdsec-automation@users.noreply.github.com>
Date: Wed, 8 Apr 2026 15:19:44 +0200
Subject: [PATCH 3/4] Add CVE-2023-29357.yaml test

---
 .../vpatch-CVE-2023-29357/CVE-2023-29357.yaml | 21 +++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 .appsec-tests/vpatch-CVE-2023-29357/CVE-2023-29357.yaml

diff --git a/.appsec-tests/vpatch-CVE-2023-29357/CVE-2023-29357.yaml b/.appsec-tests/vpatch-CVE-2023-29357/CVE-2023-29357.yaml
new file mode 100644
index 00000000000..617d5b5752d
--- /dev/null
+++ b/.appsec-tests/vpatch-CVE-2023-29357/CVE-2023-29357.yaml
@@ -0,0 +1,21 @@
+## autogenerated on 2026-04-08 13:19:37
+id: CVE-2023-29357
+info:
+  name: CVE-2023-29357
+  author: crowdsec
+  severity: info
+  description: CVE-2023-29357 testing
+  tags: appsec-testing
+http:
+  - raw:
+      - |
+        GET /_api/web/siteusers HTTP/1.1
+        Host: {{Hostname}}
+        Accept: application/json
+        Authorization: Bearer {{generate_jwt("{\"aud\":\"00000003-0000-0ff1-ce00-000000000000@realm\",\"iss\":\"00000003-0000-0ff1-ce00-000000000000\",\"nbf\":1695987703,\"exp\":2011547223,\"ver\":\"hashedprooftoken\",\"nameid\":\"00000003-0000-0ff1-ce00-000000000000@realm\",\"endpointurl\":\"qqlAJmTxpB9A67xSyZk+tmrrNmYClY/fqig7ceZNsSM=\",\"endpointurlLength\":1,\"isloopback\":true}","none")}}AAA
+        X-PROOF_TOKEN: {{generate_jwt("{\"aud\":\"00000003-0000-0ff1-ce00-000000000000@realm\",\"iss\":\"00000003-0000-0ff1-ce00-000000000000\",\"nbf\":1695987703,\"exp\":2011547223,\"ver\":\"hashedprooftoken\",\"nameid\":\"00000003-0000-0ff1-ce00-000000000000@realm\",\"endpointurl\":\"qqlAJmTxpB9A67xSyZk+tmrrNmYClY/fqig7ceZNsSM=\",\"endpointurlLength\":1,\"isloopback\":true}","none")}}AAA
+    cookie-reuse: true
+    matchers:
+    - type: status
+      status:
+       - 403

From 300fc1380989ef9a52d4b3131a4ff51c971daca8 Mon Sep 17 00:00:00 2001
From: crowdsec-automation
 <63358111+crowdsec-automation@users.noreply.github.com>
Date: Wed, 8 Apr 2026 15:19:46 +0200
Subject: [PATCH 4/4] Add vpatch-CVE-2023-29357 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 7ccf9a8bf03..0d57cf87ebb 100644
--- a/collections/crowdsecurity/appsec-virtual-patching.yaml
+++ b/collections/crowdsecurity/appsec-virtual-patching.yaml
@@ -146,6 +146,7 @@ appsec-rules:
 - crowdsecurity/vpatch-CVE-2025-2611
 - crowdsecurity/vpatch-CVE-2022-24086
 - crowdsecurity/vpatch-CVE-2021-32478
+- crowdsecurity/vpatch-CVE-2023-29357
 - crowdsecurity/vpatch-CVE-2021-26072
 - crowdsecurity/vpatch-CVE-2025-55748
 - crowdsecurity/vpatch-CVE-2022-25322