CVE-2026-91164 Warpgate: API tokens bypass the user's allowed_ip_ranges restriction
Attackers with stolen API tokens can bypass IP restrictions to access the Warpgate bastion host from unauthorized networks.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-91164?
CVE-2026-91164 is a medium-severity authentication bypass vulnerability in warp-tech warpgate, published on 21 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Warpgate is an open source SSH, HTTPS and MySQL bastion host for Linux. From 0.23.0 until 0.27.3, HTTP API token authentication resolves ConfigProvider::validate_api_token into RequestAuthorization::UserToken without enforcing the owning user's allowed_ip_ranges against the trusted client address in warpgate-protocol-http/src/common.rs. An attacker holding a leaked, phished, or exfiltrated X-Warpgate-Token can therefore use it from a prohibited network location. Deployments without allowed_ip_ranges are unaffected, and HTTP target proxying plus SSH, MySQL, PostgreSQL, RDP, VNC, and Kubernetes paths do not accept this vulnerable HTTP token flow. This issue is fixed in version 0.27.3.
Which versions are affected by CVE-2026-91164?
How do I fix CVE-2026-91164?
No fix has been published for CVE-2026-91164 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-2026-91164 being exploited?
There is no known exploitation of CVE-2026-91164 in the wild and no public exploit code.
Sources
Also known as GHSA-qmr2-wp96-h9ff.