CVE-2026-42195

LOW

Unvalidated gitlab URL parameter redirects OAuth authorize step to attacker-controlled host

Title source: cna
STIX 2.1

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.

References (3)

Core 3
Core References
X_Refsource_Misc x_refsource_misc
https://github.com/jgraph/drawio/issues/493
X_Refsource_Misc x_refsource_misc
https://github.com/jgraph/drawio/releases/tag/v29.7.9

Scores

CVSS v3 3.4
EPSS 0.0019
EPSS Percentile 9.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-200 CWE-601
Status published
Products (1)
jgraph/drawio < 29.7.9
Published May 08, 2026
Tracked Since May 09, 2026