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CVE-2026-5724— Missing Authentication on Streaming gRPC Replication Endpoint

Quick assessment

Affected
Temporal Technologies, Inc. temporal
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Temporal是temporal.io开源的一个持久化执行平台。 temporal存在安全漏洞，该漏洞源于前端gRPC服务器的流式拦截器链未包含授权拦截器，导致配置ClaimMapper和Authorizer时，流式AdminService/StreamWorkflowReplicationMessages端点接受无凭据请求，可能允许具有网络访问权限的攻击者未经身份验证打开复制流，可能导致数据渗漏。

AI Predicted 5.4 Difficulty: Moderate EPSS 0.66% · P50

Affected Version Matrix 4

VendorProduct Version RangeStatus
Temporal Technologies, Inc. temporal 1.24.0< 1.28.4 affected
1.29.0< 1.29.6 affected
1.30.0< 1.30.4 affected
1.31.0< 1.31.2 affected
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I. Basic Information for CVE-2026-5724

Vulnerability Information
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Vulnerability Title
Missing Authentication on Streaming gRPC Replication Endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
The frontend gRPC server's streaming interceptor chain did not include the authorization interceptor. When a ClaimMapper and Authorizer are configured, unary RPCs enforce authentication and authorization, but the streaming AdminService/StreamWorkflowReplicationMessages endpoint accepted requests without credentials. This endpoint is registered on the same port as WorkflowService and cannot be disabled independently. An attacker with network access to the frontend port could open the replication stream without authentication. Data exfiltration is possible, but  only when a configured replication target is correctly configured and the attacker has knowledge of the cluster configuration, as the history service validates cluster IDs and peer membership before returning replication data. The fix was applied per release line: it is present in 1.28.4, 1.29.6, 1.30.4, 1.31.2, and 1.32.0 and later releases on each line. Releases 1.31.0 and 1.31.1 do not contain the fix and are affected. Temporal Cloud is not affected.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:L/SI:N/SA:N/S:N/AU:N/R:U/RE:L
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Temporal 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Temporal是temporal.io开源的一个持久化执行平台。 temporal存在安全漏洞，该漏洞源于前端gRPC服务器的流式拦截器链未包含授权拦截器，导致配置ClaimMapper和Authorizer时，流式AdminService/StreamWorkflowReplicationMessages端点接受无凭据请求，可能允许具有网络访问权限的攻击者未经身份验证打开复制流，可能导致数据渗漏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Temporal Technologies, Inc. temporal 1.24.0 ~ 1.28.4 -

II. Public POCs for CVE-2026-5724

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III. Intelligence Information for CVE-2026-5724

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Vendor Pages for CVE-2026-5724 (4)

IV. Related Vulnerabilities

Same product: temporal
Same vendor: Temporal Technologies, Inc.
Same weakness: CWE-306

V. Comments for CVE-2026-5724

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