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01 Record

CVE-2026-89140

Temporal Server internal completion callbacks are not bound to their namespace, allowing cross-namespace changes to Scheduler V2 schedule state

MediumPUBLISHEDCNA: Temporal
CNA base score6.0 CVSS v4.0CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
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02 Description

Temporal Server internal completion callbacks are not bound to their namespace, allowing cross-namespace changes to Scheduler V2 schedule state

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.33% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 25.8% of scored records. A rank, not a probability.
NVD base score
6.0 (CVSS v4.0), scored by the NVD independently of the CNA.
NVD CVSS vector
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
NVD analysis status
Awaiting Analysis. NVD last modified this record on 2026-10-16.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-10-12 18:44Z16 DAYS AGO
Last updated
2026-10-16 17:52Z12 DAYS AGO
Reserved
2026-09-10
Assigning CNA
Temporal
Record state
PUBLISHED
Severity
Medium (CVSS 6.0)
CNA CVSS vector
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
Weaknesses
  • CWE-639Authorization Bypass Through User-Controlled KeyBase
Data version
5.2
Document digest
2c0e44e32da17f79efb100fb66758d7a061aa6e48484defcd256ceebf8c812a1

05 Affected products

VendorProductVersionsPlatforms
Temporal Technologies, Inc.Temporal Server1.30.0 to < 1.30.8, 1.31.0 to < 1.31.4, 1.32.0 to < 1.32.1—

06 References

07 Remediation

Upgrade to Temporal Server 1.30.8, 1.31.4, or 1.32.1, as appropriate for the deployed minor release line. The fix requires no configuration change and adds no setting. When a start request attaches a temporal://internal completion callback, fixed releases decode the component reference in the callback token and reject the request with InvalidArgument unless the reference names both a namespace and a business identifier and its namespace is the namespace of the request. The check runs in the Frontend service when the callback is attached, before it is persisted; it does not apply to callbacks that were attached and persisted before the upgrade, which are delivered as before. Releases before 1.30.0 do not contain the reserved internal callback address and are not affected. On 1.32, completion callbacks attached through Workflow Update are not checked in 1.32.1. That path is off by default and is not a released feature on 1.32: keep history.enableUpdateCallbacks set to false.