CVE Explorer
CVE-2026-5199
A writer role user in an attacker-controlled namespace could signal, delete, and reset workflows or activities in a victim namespace on the same cluster. Exploitation requires the attacker to know or guess specific victim workflow ID(s) and, for signal operations, signal names. This was due to a bug introduced in Temporal Server v1.29.0 which inadvertently allowed an attacker to control the namespace name value instead of using the server's own trusted name value within the batch activity code.
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"defaultStatus":"unaffected","modules":["Batch Operations"],"packageName":"temporal","product":"temporal","repo":"https://github.com/temporalio/temporal","vendor":"Temporal Technologies, Inc.","versions":[{"lessThan":"1.29.5","status":"affected","version":"1.29.0","versionType":"semver"},{"lessThan":"1.30.3","status":"affected","version":"1.30.0","versionType":"semver"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:9e81caaea369c67d9fb41029c5af9e7951af208ae5c8305c1890b071e84395b8 · sha256:0ec992092af29855… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"Automatable":"YES","Recovery":"USER","Safety":"NEGLIGIBLE","attackComplexity":"HIGH","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":2.3,"baseSeverity":"LOW","exploitMaturity":"NOT_DEFINED","privilegesRequired":"LOW","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"LOW","subConfidentialityImpact":"NONE","subIntegrityImpact":"LOW","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:L/SA:L/S:N/AU:Y/R:U/RE:M","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":…
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:9e81caaea369c67d9fb41029c5af9e7951af208ae5c8305c1890b071e84395b8 · sha256:0ec992092af29855… · /containers/cna/metrics/0/cvssV4_0
CWE assertions
1 source assertion{"cweId":"CWE-639","description":"CWE-639 Authorization bypass through User-Controlled key","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:9e81caaea369c67d9fb41029c5af9e7951af208ae5c8305c1890b071e84395b8 · sha256:0ec992092af29855… · /containers/cna/problemTypes/0/descriptions/0
Source references
2 source assertions{"url":"https://github.com/temporalio/temporal/releases/tag/v1.29.5"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:9e81caaea369c67d9fb41029c5af9e7951af208ae5c8305c1890b071e84395b8 · sha256:0ec992092af29855… · /containers/cna/references/0
{"url":"https://github.com/temporalio/temporal/releases/tag/v1.30.3"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:9e81caaea369c67d9fb41029c5af9e7951af208ae5c8305c1890b071e84395b8 · sha256:0ec992092af29855… · /containers/cna/references/1
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.