CVE-2026-42195Public exploitNetwork attack vector

OAuth state disclosure via unvalidated authorization host

Published May 8, 2026 · Updated May 8, 2026

Open redirect in draw.io before 29.7.9 allows remote attackers to obtain OAuth state tokens through a crafted link and user interaction. The client applies the gitlab and gitlab-id query parameters without validation or an allowlist, then uses them to build the GitLab OAuth authorization URL and client ID. A user must open the link and click Authorize in GitLab; the attacker-controlled popup enables credential phishing and OAuth login CSRF.

CVSS severity3.4
Low
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Open redirect in draw.io before 29.7.9 allows remote attackers to obtain OAuth state tokens through a crafted link and user interaction. The client applies the gitlab and gitlab-id query parameters without validation or an allowlist, then uses them to build the GitLab OAuth authorization URL and client ID. A user must open the link and click Authorize in GitLab; the attacker-controlled popup enables credential phishing and OAuth login CSRF.

The record

CVE
CVE-2026-42195
Published
May 8, 2026
Updated
May 8, 2026
Vendor
draw.io Ltd
Product
draw.io
Classifications
CWE-601, CWE-200, T1566.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 8, 2026CVE publishedPublication date reported by the CVE source.
  2. May 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 29.7.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

draw.io Ltd · draw.ioversion=< 29.7.9

Published CVSS scores

3.4GitHubCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-601URL Redirection to Untrusted Site ('Open Redirect')
CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1566.002Spearphishing Link

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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