CVE-2026-111927 Coder before 2.35.4 Credential Theft via Workspace Proxy Hostname Prefix Match
Attackers can steal API keys via hostname prefix matching flaws, allowing unauthorized access to victim workspaces in Coder.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-111927?
CVE-2026-111927 is a high-severity authentication bypass vulnerability in coder, published on 17 Oct 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
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.
Weakness: CWE-522
Which versions are affected by CVE-2026-111927?
How do I fix CVE-2026-111927?
No fix has been published for CVE-2026-111927 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-111927 being exploited?
There is no known exploitation of CVE-2026-111927 in the wild and no public exploit code.
Sources
Also known as GHSA-47cv-h282-xh6p, GHSA-h58h-qvv5-xvwg.