What is CVE-2023-3973?

CVE-2023-3973 is a medium-severity vulnerability in Diagrams Drawio, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2023-07-27.

How severe is CVE-2023-3973?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Diagrams Drawio

CVE-2023-3973

Cross-site Scripting (XSS) - Reflected in GitHub repository jgraph/drawio prior to 21.6.3.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2023-07-27 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.004 (33.6th percentile), scored 2026-09-23.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 33.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Diagrams Drawio
Jgraph Jgraph/drawio — versions unspecified

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

huntr.dev/bounties/4c1c5db5-210f-4d7e-8380-b95f88fdb78d (Permissions Required)
github.com/jgraph/drawio/commit/1db2c2c653aa245d175d30c210239e3946bfcb95 (Patch)

Frequently asked questions

What is CVE-2023-3973?: CVE-2023-3973 is a medium-severity vulnerability in Diagrams Drawio, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2023-07-27.
How severe is CVE-2023-3973?: Medium severity. CVSS v3 base score is 6.1 out of 10.