CVE-2026-5724Network attack vector

Unauthenticated replication-data disclosure via missing streaming interceptor

Published Apr 10, 2026 · Updated Apr 10, 2026

Authentication bypass in affected self-hosted Temporal releases allows remote attackers to read workflow replication data through the frontend port. The frontend gRPC server builds its streaming interceptor chain without the authorization interceptor, so AdminService/StreamWorkflowReplicationMessages accepts credential-free requests. Exposure requires configured ClaimMapper and Authorizer components, network access, a valid replication target, and knowledge of cluster IDs and peer membership; Temporal Cloud is unaffected.

CVSS severity6.3
Medium
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in affected self-hosted Temporal releases allows remote attackers to read workflow replication data through the frontend port. The frontend gRPC server builds its streaming interceptor chain without the authorization interceptor, so AdminService/StreamWorkflowReplicationMessages accepts credential-free requests. Exposure requires configured ClaimMapper and Authorizer components, network access, a valid replication target, and knowledge of cluster IDs and peer membership; Temporal Cloud is unaffected.

The record

CVE
CVE-2026-5724
Published
Apr 10, 2026
Updated
Apr 10, 2026
Vendor
Temporal Technologies
Product
Temporal
Classifications
CWE-306, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.24.0 <=1.28.3
  2. Affected versionversion=1.24.0 <=1.29.5
  3. Affected versionversion=1.24.0 <=1.30.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Temporal Technologies · Temporalversion=1.24.0 <=1.28.3; version=1.24.0 <=1.29.5; version=1.24.0 <=1.30.3

Published CVSS scores

6.3Temporal Technologies Inc.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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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