XSS in Temporal Oss Ui-Server

CVE-2024-2435

For an attacker with pre-existing access to send a signal to a workflow, the attacker can make the signal name a script that executes when a victim views that signal. The XSS is in the timeline page displaying the workflow execution details of the workflow that was sent the crafted signal. Access to send a signal to a workflow is determined by how you configured the authorizer on your server. This includes any entity with permission to directly call SignalWorkflowExecution or SignalWithStartWorkflowExecution, or any entity can deploy a worker that has access to call workflow progress APIs (specifically RespondWorkflowTaskCompleted).

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.004 (32.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:L.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2024-2435?
CVE-2024-2435 is a medium-severity vulnerability in Temporal Oss Ui-Server, classified under Cross-site Scripting. CVSS score: 4.3/10. Published 2024-04-02.
How severe is CVE-2024-2435?
Medium severity. CVSS v3 base score is 4.3 out of 10.