CVE-2026-50569 Fission: HTTPTrigger admission omits RelativeURL / Prefix validation; kubectl apply bypasses CLI checks
Attackers can bypass URL validation checks in Fission HTTPTriggers by using kubectl or direct API calls instead of the CLI, potentially violating security policies.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-50569?
CVE-2026-50569 is a medium-severity missing authorization vulnerability in fission, published on 10 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Fission is an open-source, Kubernetes-native serverless framework that simplifies the deployment of functions and applications on Kubernetes. Prior to version 1.25.0, HTTPTriggerSpec.Validate() validated Methods, FunctionReference, Host, IngressConfig, and CorsConfig, but silently skipped RelativeURL and Prefix. Those two fields were validated at the CLI level only (pkg/fission-cli/cmd/httptrigger/create.go:83). The post-CRD-modernization webhook for HTTPTrigger was retired in favor of API-server CEL — and CEL had no rules on those fields either — so an HTTPTrigger created via kubectl apply or a direct Kubernetes REST API call bypassed every URL-level check. This issue has been patched in version 1.25.0.
Weakness: CWE-20
Which versions are affected by CVE-2026-50569?
3 open source packages ship an affected version, including github.com/fission/fission.
| Package | Affected | Fixed in |
|---|---|---|
github.com/fission/fission Go | All versions | 1.25.0 |
github.com/fission/fission Go | All versions | 1.25.0 |
github.com/fission/fission Go | All versions | 1.25.0 |
How do I fix CVE-2026-50569?
Upgrade github.com/fission/fission to 1.25.0 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-50569 being exploited?
There is no known exploitation of CVE-2026-50569 in the wild and no public exploit code.
Sources
Also known as GHSA-vchh-r53j-8mpw, GO-2026-6131.