CVE-2026-43910: Java client Java-client Allows Network Pivot Vulnerability
HIGHCVE-2026-43910 is a HIGH (CVSS 8.2) java-client allows network pivot vulnerability (CWE-441: Unintended Proxy or Intermediary ('Confused Deputy')) affecting Java client libraries in the Maven ecosystem. The issue involves java-client allows network pivot via unvalidated directconnect redirect in appiumcommandexecutor. Remediation is available by upgrading affected packages to version 10.1.1.
CVE-2026-43910 at a Glance
Security Impact
CVSS: 8.2
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N).
How to Fix CVE-2026-43910
To remediate this vulnerability, upgrade all affected Java client dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
<dependency>
<groupId>io.appium</groupId>
<artifactId>java-client</artifactId>
<version>10.1.1</version>
</dependency>Run the following command in your project directory to verify that all resolved dependencies use the patched release:
mvn dependency:tree -Dincludes=io.appiumHow to Check if You Are Affected
To determine whether your Java application is affected by CVE-2026-43910, inspect your build dependencies using the Maven Dependency Plugin:
mvn dependency:tree -Dincludes=io.appiumAnalyze the terminal output to locate any version of Java client in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 10.1.1), your application is affected.
Note: The mvn dependency:tree -Dincludes=io.appium command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-441: Unintended Proxy or Intermediary ('Confused Deputy'), where the product receives a request, message, or directive from an upstream component, but the product does not sufficiently preserve the original source of the request before forwarding the request to an external actor that is outside of the product's control sphere. this causes the product to appear to be the source of the request, leading it to act as a proxy or other intermediary between the upstream component and the external actor. In Java client, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2026-43910 Affected Java client Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
io.appium:java-client
|
Maven |
≥ 8.2.1
< 10.1.1
|
10.1.1
|
References
Frequently Asked Questions
What is CVE-2026-43910?
Which Java client versions are affected?
What version fixes CVE-2026-43910?
Is java-client affected?
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What CWE is associated with CVE-2026-43910?
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Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-28f5-38xr-jh2w",
"modified" : "2026-07-28T14:26:53Z",
"published" : "2026-07-28T14:26:53Z",
"aliases" : [ "CVE-2026-43910" ],
"summary" : "java-client Allows Network Pivot via Unvalidated directConnect Redirect in AppiumCommandExecutor",
"details" : "## Summary\n\nWhen `directConnect(true)` is enabled, appium/java-client unconditionally\naccepts `directConnectHost`, `directConnectPort`, and `directConnectPath`\nfrom the server's NEW_SESSION response and silently redirects all subsequent\nsession traffic to the attacker-specified endpoint — with no allowlist,\nno host validation, and no user notification.\n\n## Affected Code\n\n- `AppiumCommandExecutor.java` (line 196–219): `setDirectConnect()` builds\n a new URL from server-supplied fields and calls `overrideServerUrl(newUrl)`\n without validating host/IP.\n- `DirectConnect.java`: `getUrl()` constructs `protocol://host:port/path`\n with no allowlist.\n\n## Root Cause\n\nOnly the protocol is validated (must equal \"https\"). The destination host\nand port are never checked against any allowlist or denylist.\n\n## PoC (confirmed)\n\nA rogue server injecting `directConnectHost=127.0.0.1:4443` causes the\nclient to silently redirect all post-session commands:\n\n[bootstrap] POST /wd/hub/session\n[bootstrap] Injecting directConnect -> https://127.0.0.1:4443/wd/hub\n[redirect-target] HIT #1: GET /wd/hub/session/poc-session-001/source\n[redirect-target] HIT #2: DELETE /wd/hub/session/poc-session-001\n\nOriginal source code unmodified — confirmed via `git diff HEAD` (empty).\n\n## Evidence Screenshots\n\n**Screenshot 1 — Rogue server capturing redirected traffic:**\n\n<img width=\"887\" height=\"146\" alt=\"1\" src=\"https://github.com/user-attachments/assets/cc28002c-ea20-4ac8-8336-cec632e3c842\" />\n\n**Screenshot 2 — Java client processing response from attacker host:**\n\n<img width=\"788\" height=\"130\" alt=\"2\" src=\"https://github.com/user-attachments/assets/222cbab0-0d53-45b2-847d-6aa4e3b79370\" />\n\n## Impact\n\n- Full interception of session traffic\n- Network pivot to internal hosts (RFC-1918, 169.254.169.254)\n- Cloud credential theft via IMDS endpoint\n- Escalates to ~8.1 High in CI/CD environments where directConnect(true)\n is set in shared base configuration\n\n## Suggested Fix\n\nAdd allowlist validation before `overrideServerUrl()` is called, and/or\nblock RFC-1918/loopback/link-local destinations by default.\n\n[poc_appium_directconnect.zip](https://github.com/user-attachments/files/26472525/poc_appium_directconnect.zip)",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Maven",
"name" : "io.appium:java-client"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "8.2.1"
}, {
"fixed" : "10.1.1"
} ]
} ],
"database_specific" : {
"last_known_affected_version_range" : "<= 10.1.0"
}
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/appium/java-client/security/advisories/GHSA-28f5-38xr-jh2w"
}, {
"type" : "WEB",
"url" : "https://github.com/appium/java-client/pull/2408"
}, {
"type" : "WEB",
"url" : "https://github.com/appium/java-client/commit/2b9cd442b9dbf56ccc6f1e83aeeb411c0ec230c9"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/appium/java-client"
}, {
"type" : "WEB",
"url" : "https://github.com/appium/java-client/releases/tag/v10.1.1"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-441", "CWE-918" ],
"severity" : "HIGH",
"github_reviewed" : true,
"github_reviewed_at" : "2026-07-28T14:26:53Z",
"nvd_published_at" : null
}
}