TI-2026-51863 Aliases CVE-2026-73840 GHSA-c5f6-2rm9-2w8g

OpenChoreo: Unauthenticated build/workflow trigger via git-provider confusion (webhook signature bypass)

LOW 30CWE-287Published 2026-08-13 · Updated 2026-08-14

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: None · None · Low
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-287.

Summary

OpenChoreo is a complete, open-source developer platform for Kubernetes. Prior to 1.0.3, 1.1.3, and 1.2.0-rc.2, the POST /api/v1alpha1/autobuild endpoint in internal/openchoreo-api/api/handlers/webhook_handler.go selected a webhook provider from caller-controlled X-Event-Key, accepted Bitbucket requests without HMAC-SHA256 in X-Hub-Signature or a configured bitbucket-secret, and allowed unauthenticated build triggers for components matched by repository URL and branch, including cross-provider triggers using attacker-supplied commit SHAs. This issue is fixed in versions 1.0.3, 1.1.3, and 1.2.0-rc.2.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00346 28th percentileScored 2026-11-07

Fix Fixed openchoreo (openchoreo): 1.0.3, 1.1.3, 1.2.0-rc.2github.com/openchoreo/openchoreo (Go): 1.0.3, 1.1.3, 1.2.0-rc.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
openchoreo	openchoreo	before 1.0.3; 1.1.0 to before 1.1.3; 1.2.0-rc.1 to before 1.2.0-rc.2	1.0.3, 1.1.3, 1.2.0-rc.2	Patch available	CNA
—	github.com/openchoreo/openchoreo (Go)	before 1.0.3	1.0.3	Patch available	GHSA-c5f6-2rm9-2w8g
—	github.com/openchoreo/openchoreo (Go)	1.1.0 to before 1.1.3	1.1.3	Patch available	GHSA-c5f6-2rm9-2w8g
—	github.com/openchoreo/openchoreo (Go)	1.2.0-rc.1 to before 1.2.0-rc.2	1.2.0-rc.2	Patch available	GHSA-c5f6-2rm9-2w8g

openchoreo Vendoropenchoreo Affected before 1.0.3; 1.1.0 to before 1.1.3; 1.2.0-rc.1 to before 1.2.0-rc.2 Fixed in 1.0.3, 1.1.3, 1.2.0-rc.2 Patch available CNA
github.com/openchoreo/openchoreo (Go) Vendor— Affected before 1.0.3 Fixed in 1.0.3 Patch available GHSA-c5f6-2rm9-2w8g
github.com/openchoreo/openchoreo (Go) Vendor— Affected 1.1.0 to before 1.1.3 Fixed in 1.1.3 Patch available GHSA-c5f6-2rm9-2w8g
github.com/openchoreo/openchoreo (Go) Vendor— Affected 1.2.0-rc.1 to before 1.2.0-rc.2 Fixed in 1.2.0-rc.2 Patch available GHSA-c5f6-2rm9-2w8g

Remediation

Fix · CNA openchoreo (openchoreo) Fixed in 1.0.3, 1.1.3, 1.2.0-rc.2
Fix · GHSA-c5f6-2rm9-2w8g github.com/openchoreo/openchoreo (Go) Fixed in 1.0.3 Advisory →
Fix · GHSA-c5f6-2rm9-2w8g github.com/openchoreo/openchoreo (Go) Fixed in 1.1.3 Advisory →
Fix · GHSA-c5f6-2rm9-2w8g github.com/openchoreo/openchoreo (Go) Fixed in 1.2.0-rc.2 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-73840
2026-10-03 Alias added: GHSA-c5f6-2rm9-2w8g

References

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-73840

Other 11

TI-2026-51866 OpenChoreo: Unauthenticated access to data-plane operations via OpenChoreo cluster-gateway management APIs CVSS 3.1CRITICAL 9.6
TI-2026-51750 Missing authentication in openchoreo backstage-plugins CVSS 3.1HIGH 8.2
TI-2026-51864 Authorization bypass in openchoreo CVSS 3.1HIGH 8.8
TI-2026-51751 OS command injection in openchoreo CVSS 3.1HIGH 8.8
TI-2026-51865 Improper privilege management in openchoreo CVSS 3.1CRITICAL 9.0
TI-2026-78530 OpenChoreo authorization bypass lets callers take over workflow runs CVSS 3.1HIGH 7.4

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences