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01 Record

CVE-2026-104355

Temporal Server applies inbound namespace replication from a connected peer cluster to local namespaces

HighPUBLISHEDCNA: Temporal
CNA base score7.0 CVSS v4.0CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N
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02 Description

Temporal Server applies inbound namespace replication from a connected peer cluster to local namespaces

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
0.35% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 29.4% of scored records. A rank, not a probability.
NVD base score
7.0 (CVSS v4.0), scored by the NVD independently of the CNA.
NVD CVSS vector
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
NVD analysis status
Awaiting Analysis. NVD last modified this record on 2026-10-16.
Red Hat severity
Moderate. Red Hat's rating for its own products, not a CVSS rating.

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 18:43Z16 DAYS AGO
Last updated
2026-10-16 17:50Z12 DAYS AGO
Reserved
2026-10-01
Assigning CNA
Temporal
Record state
PUBLISHED
Severity
High (CVSS 7.0)
CNA CVSS vector
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
Weaknesses
  • CWE-863Incorrect AuthorizationClass
  • CWE-15External Control of System or Configuration SettingBase
Data version
5.2
Document digest
560a84336fe079afdd3f5833be8c1e762530f1f4f13d34666dae4f493e419336

05 Affected products

VendorProductVersionsPlatforms
Temporal Technologies, Inc.Temporal Server1.0.0 to 1.29.7, 1.30.0 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, and keep the dynamic configuration setting history.validateReplicationTaskSourceCluster at its default of true. Fixed releases ignore an inbound namespace replication task, including one applied through the namespace metadata refresh that history replication can trigger, when it targets a namespace the receiving cluster stores as local, and ignore inbound task queue user data replication for a local namespace. With history.validateReplicationTaskSourceCluster enabled, fixed releases also ignore an inbound history replication task when the sending cluster is not in the namespace's cluster list, which for a local namespace is every remote cluster. The fix does not change how a connected peer can update a global namespace replicated with the receiving cluster. Fixed releases do not repair a local namespace that was already modified; review local namespaces, including temporal-system, as described in the workarounds. Temporal Server releases up to and including 1.29.7 are outside the supported window and receive no fix; operators on those releases should upgrade to a supported line.