8 matches found
CVE-2026-87858 Temporal Server completion callback source header can direct attacker-chosen requests to the internal frontend with administrator authorization
Temporal Server decided whether a Workflow completion callback was internal by reading a caller-supplied HTTP header. An authenticated caller holding only write permission in a single namespace could attach a completion callback whose URL host matched the configured callback address allowlist,...
CVE-2026-87858
Temporal Server is vulnerable in its Workflow completion callback delivery logic (both HSM and CHASM implementations). A caller with only write permission in a single namespace can attach a callback with a non-empty source header, causing the History service to re-target the request to the intern...
PT-2026-96078
Name of the Vulnerable Software and Affected Versions Temporal Server versions 1.25.0 through 1.30.x Description An authenticated user with write permissions in a single namespace can trigger unauthorized administrative actions by exploiting how the server identifies internal Workflow completion...
SUSE 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 IDs and, for signal operations, signal names. This was due to a bu...
CVE-2026-5199 Cross Namespace Access via Batch Operation
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 IDs and, for signal operations, signal names. This was due to a bu...
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 IDs and, for signal operations, signal names. This was due to a bu...
CVE-2026-5199
The CVE-2026-5199 issue arises from a bug in Temporal Server v1.29.0 where a writer in an attacker-controlled namespace could signal, delete, or reset workflows/activities in a victim namespace on the same cluster. The root cause is that the batch activity validated the victim namespace ID but di...
