CVE-2026-42195 Unvalidated gitlab URL parameter redirects OAuth authorize step to attacker-controlled host
Attackers can redirect OAuth authorization to malicious hosts via a URL parameter, enabling credential phishing and token theft in draw.io.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-42195?
CVE-2026-42195 is a low-severity vulnerability in jgraph drawio, published on 8 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
draw.io is a configurable diagramming and whiteboarding application. Prior to version 29.7.9, the draw.io client accepts a ?gitlab= URL parameter that overrides the GitLab server URL used during OAuth sign-in. A crafted link causes the user's click on draw.io's "Authorize in GitLab" dialog to open a popup on the attacker-controlled host instead of gitlab.com. This can lead to credential fishing and session state token exfiltration. This issue has been patched in version 29.7.9.
Which versions are affected by CVE-2026-42195?
How do I fix CVE-2026-42195?
No fix has been published for CVE-2026-42195 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-42195 being exploited?
There is no known exploitation of CVE-2026-42195 in the wild and no public exploit code.
Sources
Also known as GHSA-8x7j-m8px-7p8x.