CVE-2026-41187: Access Control Flaw

Description

Calico's apiserver wraps tier-scoped resources so that every operation runs through AuthorizeTierOperation, but the Delete override on NetworkPolicy, GlobalNetworkPolicy, and their staged variants is not invoked for DeleteCollection requests. A user holding the deletecollection verb or wildcard verbs on tier-scoped policy resources can bulk-delete policies in tiers they otherwise have no rights on, breaking the tier authorization boundary.

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Weakness Type (CWE)

CWE-285 CWE-285

CWE-863 Incorrect Authorization

References

Other References

https://github.com/projectcalico/calico/pull/12731 https://github.com/projectcalico/calico/pull/12735 https://github.com/projectcalico/calico/pull/12736 https://github.com/projectcalico/calico/pull/12737 https://www.tigera.io/security-bulletins/tta-2026-006/

Frequently Asked Questions

What is CVE-2026-41187? +

Calico's apiserver wraps tier-scoped resources so that every operation runs through AuthorizeTierOperation, but the Delete override on NetworkPolicy, GlobalNetworkPolicy, and their staged variants is not invoked for DeleteCollection requests. A user holding the deletecollection verb or wildcard verbs on tier-scoped policy resources can bulk-delete policies in tiers they otherwise have no rights on, breaking the tier authorization boundary.

How do I check if I'm vulnerable to CVE-2026-41187? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2026-41187