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CVE-2026-63373— draw.io: OAuth CSRF via missing state validation on self-hosted deployments allows session token injection

Quick assessment

Affected
jgraph drawio
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

draw.io is a configurable diagramming and whiteboarding application. Prior to version 30.2.7, the OAuth callback handler in src/main/java/com/mxgraph/online/AbsAuth.java skips comparison of stateToken and cookieToken whenever IS_GAE is false, which affects sel

CVSS 4.2 · Medium EPSS 0.13% · P3

Affected Version Matrix 1

VendorProduct Version RangeStatus
jgraph drawio < 30.2.7 affected
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I. Basic Information for CVE-2026-63373

Vulnerability Information

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Vulnerability Title
draw.io: OAuth CSRF via missing state validation on self-hosted deployments allows session token injection
Source: CVE Program / CVE List V5
Vulnerability Description
draw.io is a configurable diagramming and whiteboarding application. Prior to version 30.2.7, the OAuth callback handler in src/main/java/com/mxgraph/online/AbsAuth.java skips comparison of stateToken and cookieToken whenever IS_GAE is false, which affects self-hosted Docker and WAR deployments. An attacker can provide an authorization code for the attacker's cloud-storage identity and induce a victim to visit a callback URL, causing the victim's draw.io session to become authenticated as the attacker identity without a valid state binding. The shared handler affects Google Drive, OneDrive, GitHub, GitLab, and Dropbox integrations. The victim can then unknowingly perform cloud-storage actions under the attacker's identity, causing session integrity loss and misattribution, but the identity binding does not itself grant access to existing victim cloud files. This issue is fixed in version 30.2.7.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨站请求伪造(CSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
jgraph drawio < 30.2.7 -

II. Public POCs for CVE-2026-63373

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III. Intelligence Information for CVE-2026-63373

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Other References for CVE-2026-63373 (2)

Same Patch Batch · jgraph · 2026-09-21 · 5 CVEs total

CVE-2026-76898 7.7 HIGH draw.io: Unauthenticated SSRF via IPv6 ULA blocklist bypass in /embed2.js
CVE-2026-63334 6.8 MEDIUM draw.io: SSRF via DNS rebinding in ProxyServlet bypasses private IP blocklist
CVE-2026-58504 6.1 MEDIUM draw.io: Stored XSS on file open via editable=0 sibling cell — patch bypass of CVE-2026-46
CVE-2026-63416 3.7 LOW draw.io: Path traversal in ExportProxyServlet allows access to arbitrary backend endpoints

IV. Related Vulnerabilities

Same product: drawio
Same vendor: jgraph
Same weakness: CWE-352

V. Comments for CVE-2026-63373

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