CVE-2026-111927
Published:October 17, 2026
Updated:October 22, 2026
Coder before 2.29.20, 2.33.0 before 2.33.12, 2.34.0 before 2.34.8, and 2.35.0 before 2.35.4 contains an improper hostname validation flaw in GetWorkspaceProxyByHostname whose SIMILAR TO pattern performs a prefix match, so any domain that is a string prefix of a workspace-proxy access URL is trusted as a proxy. Attackers owning such a domain can lure an authenticated victim to a crafted /api/v2/applications/auth-redirect link, capture the redirected application_connect API key, and replay it to access the victim's workspace apps.
Affected Packages
github.com/coder/coder/v2 (GO):
Affected version(s) >=v2.34.0 <v2.34.8Fix Suggestion:
Update to version v2.34.8github.com/coder/coder/v2 (GO):
Affected version(s) >=v2.35.0 <v2.35.4Fix Suggestion:
Update to version v2.35.4github.com/coder/coder/v2 (GO):
Affected version(s) >=v2.0.0 <v2.29.20Fix Suggestion:
Update to version v2.29.20Related Resources (4)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
PRESENT
Privileges Required
LOW
User Interaction
PASSIVE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
HIGH
Subsequent System Integrity
HIGH
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.7
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Insufficiently Protected Credentials
EPSS
Base Score:
0.21