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CVE-2026-42195

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

Published: May 8, 2026Updated: May 12, 2026 Sources: CVE List NVDCWE-200
NVD MITRE
3.4CVSSLOW
EPSS Score
0.2%
Top 91.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

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.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:RS:CC:LI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-200CWE-601

Affected Products

drawiojgraph
Mixed
Web & CMS Plugins / site-builder
jgraphcommercialWeb & CMS Pluginsaka drawio, mxgraph, jgraph/drawio

Attack Graph

Products CVE Techniques Tactics

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Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

2 techniques
Collection
Initial Access
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References

https://github.com/jgraph/drawio/security/advisories/GHSA-8x7j-m8px-7p8x
github.com
https://github.com/jgraph/drawio/issues/493
github.com
https://github.com/jgraph/drawio/releases/tag/v29.7.9
github.com

Timeline

Published
May 8, 2026
Last Updated
May 12, 2026

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