CVE-2026-89140: Software Security Vulnerability Vulnerability
MODERATECVE-2026-89140 is a MODERATE security vulnerability vulnerability (CWE-639: Authorization Bypass Through User-Controlled Key) affecting Software libraries in the Maven ecosystem. The weakness occurs when the system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.. Remediation is available in the latest vendor maintenance releases.
CVE-2026-89140 at a Glance
How to Fix CVE-2026-89140
To remediate this vulnerability, upgrade all affected Software dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
Run the following command in your project directory to verify that all resolved dependencies use the patched release:
mvn dependency:treeHow to Check if You Are Affected
To determine whether your Java application is affected by CVE-2026-89140, inspect your build dependencies using the Maven Dependency Plugin:
mvn dependency:treeAnalyze the terminal output to locate any version of Software in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.
Note: The mvn dependency:tree 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-639: Authorization Bypass Through User-Controlled Key, where the system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. In Software, 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
References
Frequently Asked Questions
What is CVE-2026-89140?
Which Software versions are affected?
What version fixes CVE-2026-89140?
What CWE is associated with CVE-2026-89140?
How can I check Maven dependencies for CVE-2026-89140?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-fmmr-q3xv-r2hc",
"modified" : "2026-10-12T21:31:55Z",
"published" : "2026-10-12T21:31:55Z",
"aliases" : [ "CVE-2026-89140" ],
"details" : "Temporal Server does not bind internal completion callbacks to the namespace that attached them, which allows an authenticated caller with write permission in one namespace to alter Scheduler V2 schedule state in another namespace. The callback address temporal://internal is reserved for callbacks that Scheduler V2 attaches to the Workflows it starts. In affected releases, any authenticated caller could attach a callback with that address to a Workflow start request, the address was exempt from the component.callbacks.allowedAddresses allowlist, and the History service delivered the callback to the component its token named, in whatever namespace that was, without authorizing the original caller there. When the forged completion matches an action a target schedule is running, the schedule records the action as completed while its Workflow still runs, which can defeat an overlap policy such as SKIP, and passes caller-controlled data to the next scheduled Workflow as its last completion result. A forged failure may also pause a schedule configured to pause on failure. A forgery requires the target namespace identifier, the schedule identifier, and the identity and timing of a running action. No disclosure of Workflow payloads or history was identified. Only namespaces that hold Scheduler V2 schedules can be targeted; Scheduler V2 is off by default, and existing Scheduler V2 schedules remain targets after the settings that create them are turned off.",
"severity" : [ {
"type" : "CVSS_V4",
"score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
} ],
"affected" : [ ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-89140"
}, {
"type" : "WEB",
"url" : "https://github.com/temporalio/temporal/pull/11876"
}, {
"type" : "WEB",
"url" : "https://github.com/temporalio/temporal/pull/12318"
}, {
"type" : "WEB",
"url" : "https://github.com/temporalio/temporal/pull/12319"
}, {
"type" : "WEB",
"url" : "https://github.com/temporalio/temporal/pull/12320"
}, {
"type" : "WEB",
"url" : "https://github.com/temporalio/temporal/pull/12382"
}, {
"type" : "WEB",
"url" : "https://github.com/temporalio/temporal/commit/a210eeb8c2cc7e22338bb4f552ff1171d8f35969"
}, {
"type" : "WEB",
"url" : "https://github.com/temporalio/temporal/commit/d0bd72e85014f31ecfbada1b436b08806496dbef"
}, {
"type" : "WEB",
"url" : "https://github.com/temporalio/temporal/releases/tag/v1.30.8"
}, {
"type" : "WEB",
"url" : "https://github.com/temporalio/temporal/releases/tag/v1.31.4"
}, {
"type" : "WEB",
"url" : "https://github.com/temporalio/temporal/releases/tag/v1.32.1"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-639" ],
"severity" : "MODERATE",
"github_reviewed" : false,
"github_reviewed_at" : null,
"nvd_published_at" : "2026-10-12T19:16:40Z"
}
}