CVE-2026-104355: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-vvgp-p2h7-g3xf
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CWE-863
Published
Advisory Summary

CVE-2026-104355 is a HIGH security vulnerability vulnerability (CWE-863: Incorrect Authorization) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-104355 at a Glance

CVE Identifier CVE-2026-104355
GHSA Identifier GHSA-vvgp-p2h7-g3xf
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-863: Incorrect Authorization
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2026-104355

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.

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-104355, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

Analyze 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-863: Incorrect Authorization, where the product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. 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

A connected peer cluster can modify a Temporal Server cluster's local namespaces, which are never replicated to that peer, because the receiving cluster applies inbound namespace replication updates to them. In a multi-cluster deployment, each cluster pulls replication tasks from the remote clusters an administrator has registered with connection enabled; the sending side excludes local namespaces, but the receiving side does not apply the same rule. When an inbound task names an existing namespace, the server checks at most that the namespace identifiers match, then overwrites its state, description, owner, retention, archival settings, and cluster list, and its active cluster when the task carries a higher failover version, without checking that the namespace is global. A party that controls a registered peer's replies, by operating or compromising it, can therefore change any local namespace whose name and identifier it can supply, without any credential on the receiving cluster: for example, marking it Deprecated, making the peer its active cluster, and shortening its retention, after which new Workflow starts in that namespace fail. Local namespaces include the built-in temporal-system namespace. Namespace metadata the History service refreshes from the peer while processing its history replication tasks passes through the same logic. A cluster with no remote cluster registered with connection enabled is not exposed.

References

NVD — CVE-2026-104355 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-104355
Software Source Repository REPOSITORY
https://github.com/temporalio/temporal/pull/12323
Software Source Repository REPOSITORY
https://github.com/temporalio/temporal/pull/12328
Software Source Repository REPOSITORY
https://github.com/temporalio/temporal/pull/12329
Software Source Repository REPOSITORY
https://github.com/temporalio/temporal/pull/12330
Security Fix Commit FIX COMMIT
https://github.com/temporalio/temporal/commit/f2b571e2eee8a9143fbc4711f3db8b5a37146b3b
Software Source Repository REPOSITORY
https://github.com/temporalio/temporal/blob/v1.0.0/common/namespace/replicationTaskExecutor.go#L191-L260
Software Release RELEASE
https://github.com/temporalio/temporal/releases/tag/v1.30.8
Software Release RELEASE
https://github.com/temporalio/temporal/releases/tag/v1.31.4
Software Release RELEASE
https://github.com/temporalio/temporal/releases/tag/v1.32.1

Frequently Asked Questions

What is CVE-2026-104355?
CVE-2026-104355 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-863: Incorrect Authorization.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-104355?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2026-104355?
CVE-2026-104355 is classified under CWE-863: Incorrect Authorization (The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.).
How can I check Maven dependencies for CVE-2026-104355?
Run the dependency tree command: 'mvn dependency:tree'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-vvgp-p2h7-g3xf",
  "modified" : "2026-10-12T21:31:54Z",
  "published" : "2026-10-12T21:31:54Z",
  "aliases" : [ "CVE-2026-104355" ],
  "details" : "A connected peer cluster can modify a Temporal Server cluster's local namespaces, which are never replicated to that peer, because the receiving cluster applies inbound namespace replication updates to them. In a multi-cluster deployment, each cluster pulls replication tasks from the remote clusters an administrator has registered with connection enabled; the sending side excludes local namespaces, but the receiving side does not apply the same rule. When an inbound task names an existing namespace, the server checks at most that the namespace identifiers match, then overwrites its state, description, owner, retention, archival settings, and cluster list, and its active cluster when the task carries a higher failover version, without checking that the namespace is global. A party that controls a registered peer's replies, by operating or compromising it, can therefore change any local namespace whose name and identifier it can supply, without any credential on the receiving cluster: for example, marking it Deprecated, making the peer its active cluster, and shortening its retention, after which new Workflow starts in that namespace fail. Local namespaces include the built-in temporal-system namespace. Namespace metadata the History service refreshes from the peer while processing its history replication tasks passes through the same logic. A cluster with no remote cluster registered with connection enabled is not exposed.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:L/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-2026-104355"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/temporalio/temporal/pull/12323"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/temporalio/temporal/pull/12328"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/temporalio/temporal/pull/12329"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/temporalio/temporal/pull/12330"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/temporalio/temporal/commit/f2b571e2eee8a9143fbc4711f3db8b5a37146b3b"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/temporalio/temporal/blob/v1.0.0/common/namespace/replicationTaskExecutor.go#L191-L260"
  }, {
    "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-863" ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-10-12T19:16:36Z"
  }
}