CVE-2026-77459 Argo CD - Broken Access Control

Argo CD 2.10.0 to 3.3.15, 3.4.10, 3.5.4, and 3.6.0-rc2 contains a broken access control vulnerability caused by omission of AppProject destination and resource authorization checks in PostDelete resource hooks, letting users with write access to an Application's Git repository create unauthorized cluster-scoped or namespaced resources during deletion, exploit requires write access to the Application's Git repository.

CVSS base score 9.9 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.72% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Privilege Escalation, Data Tampering
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Published
13 October 2026
Updated
15 October 2026
Weakness
CWE-863

Vendor fix

Update to versions 3.3.15, 3.4.10, 3.5.4, 3.6.0-rc2 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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