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VulnerabilityPublished Updated

CVE-2026-5724: temporal · Missing Authentication

Affects temporalSource CVE Database V5

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Not known to be exploited · CVSS 6.3 Medium · fixed in 1.31.2 : update temporal when convenient.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 4.0 base score
6.3Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.5% chance of exploitation in 30 days – higher than 44% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 1.31.2, 1.30.4, 1.29.6 +1
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

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 10 Apr 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: evidence found.

    Public exploit code: GitHub proofs of concept

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), GitHub proofs of concept, the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Upgrade temporal to 1.31.2, 1.30.4, 1.29.6 or 1.28.4.

Affected software

ProductAffectedFixed in
Temporal Technologies, Inc.temporalAffected
  • >=1.31.0 <1.31.2
Fixed in
  • 1.31.2
Temporal Technologies, Inc.temporalAffected
  • >=1.30.0 <1.30.4
Fixed in
  • 1.30.4
Temporal Technologies, Inc.temporalAffected
  • >=1.29.0 <1.29.6
Fixed in
  • 1.29.6
Temporal Technologies, Inc.temporalAffected
  • >=1.24.0 <1.28.4
Fixed in
  • 1.28.4
GitHubtemporalio/temporalpkg:github/temporalio/temporalOther threatsAffected
  • =1.24.0
Fixed in–
GitHubtemporalpkg:github/temporalOther threatsAffected
  • >=1.24.0 <1.28.4
  • >=1.29.0 <1.29.6
  • >=1.30.0 <1.30.4
  • >=1.31.0 <1.31.2
Fixed in
  • 1.28.4
  • 1.29.6
  • 1.30.4
  • 1.31.2

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Fixes for this vulnerability have been applied in Temporal versions 1.28.4, 1.29.6, 1.30.4, 1.31.2, 1.32.0, and later. Versions 1.31.0 and 1.31.1 remain vulnerable and should be upgraded to a fixed release to mitigate the risk. Temporal Cloud is not affected and requires no action. Patch status is confirmed by vendor advisory information.

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.

References

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