CVE-2026-111927

Coder before 2.35.4 Credential Theft via Workspace Proxy Hostname Prefix Match

State: Published
Severity: 8.7 High
Published: Oct 17, 2026
Updated: Oct 21, 2026
Reserved: Oct 17, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N	VulnCheck
3.1	7.7 High	CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N	VulnCheck

Weaknesses

CWE-522 Insufficiently Protected Credentials

Affected Products

Product	Versions
codercoder	2.35.0 to before 2.35.4Affected 2.35.4Not affected
codercoder	2.34.0 to before 2.34.8Affected 2.34.8Not affected
codercoder	2.33.0 to before 2.33.12Affected 2.33.12Not affected
codercoder	before 2.29.20Affected 2.29.20Not affected

References

GitHub Security Advisory (GHSA-h58h-qvv5-xvwg)vendor-advisory
VulnCheck Advisory: Coder before 2.35.4 Credential Theft via Workspace Proxy Hostname Prefix Matchthird-party-advisory

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