Authorization Bypass Through User-Controlled Key Affecting go.temporal.io/server/service/worker/batcher package, versions >=1.29.0 <1.29.5>=1.30.0 <1.30.3
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-GOLANG-GOTEMPORALIOSERVERSERVICEWORKERBATCHER-15873853
- published2 Apr 2026
- disclosed1 Apr 2026
- creditUnknown
Introduced: 1 Apr 2026
CVE-2026-5199 (opens in a new tab)How to fix?
Upgrade go.temporal.io/server/service/worker/batcher to version 1.29.5, 1.30.3 or higher.
Overview
Affected versions of this package are vulnerable to Authorization Bypass Through User-Controlled Key via batch operation. An attacker can perform unauthorized operations such as signaling, deleting, or resetting workflows or activities in another namespace by manipulating the namespace name value and knowing or guessing specific workflow IDs and, for signal operations, signal names.
Note:
This is only exploitable if the server is configured to allow internal components cross-namespace authorization, such as with the internal-frontend service or equivalent TLS-based authorization for internal identities.