Vulnerability · Published Oct 17, 2026 · Assigned by VulnCheck

CVE-2026-111927Coder before 2.35.4 Credential Theft via Workspace Proxy Hostname Prefix Match

High 7.7

In plain English

A high-severity security flaw in coder from coder. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 11% of all known vulnerabilities).

Severity (CVSS 3.1)7.7High

Exploit odds (30 days)0.2%top 89.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
coder	coder	2.35.0 – before 2.35.4
coder	coder	2.34.0 – before 2.34.8
coder	coder	2.33.0 – before 2.33.12
coder	coder	0 – before 2.29.20

Weakness: CWE-522 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N

References

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