Vulnerability · Published Sep 21, 2026 · Assigned by GitHub_M

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

Medium 4.2

In plain English

A medium-severity cross-site request forgery in drawio from jgraph. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 4% of all known vulnerabilities).

Severity (CVSS 3.1)4.2Medium

Exploit odds (30 days)0.2%top 95.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
jgraph	drawio	< 30.2.7

Weakness: CWE-352 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N

References

https://github.com/jgraph/drawio/security/advisories/GHSA-mcj5-3pww-7g49 x_refsource_CONFIRM
https://github.com/jgraph/drawio/commit/650fbd742814f6502f78248dc2d8e2aaa5e42b5e x_refsource_MISC
https://github.com/jgraph/drawio/releases/tag/v30.2.7 x_refsource_MISC