SB2026073015 - Multiple vulnerabilities in draw.io

Description

This security bulletin contains information about 2 vulnerabilities.

1) Prototype pollution (CVE-ID: N/A)

CWE-ID: CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes (\'Prototype Pollution\')

CVSSv4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]

The vulnerability allows a remote attacker to execute arbitrary JavaScript code.

The vulnerability exists due to improper input validation in mxGraphMlCodec. A remote attacker can pass specially crafted input to the application and perform prototype pollution, which can result in information disclosure or data manipulation.

2) Server-Side Request Forgery (SSRF) (CVE-ID: CVE-2026-76898)

CWE-ID: CWE-918 - Server-Side Request Forgery (SSRF)

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to perform server-side request forgery and disclose sensitive information.

The vulnerability exists due to server-side request forgery in /embed2.js when fetching a user-supplied URL. A remote attacker can send a specially crafted request with an IPv6 ULA target to perform server-side request forgery and disclose sensitive information.

The issue is reachable without authentication via the /embed2.js?fetch= endpoint, and the fetched response is reflected back to the client. On dual-stack hosts, this can expose data from IPv6 ULA-addressed internal services such as instance metadata endpoints.

Remediation

Install update from vendor's website.

References

• https://github.com/jgraph/drawio/security/advisories/GHSA-vvpv-f297-2ghp
• https://github.com/jgraph/drawio/security/advisories/GHSA-m3q9-cwfq-hcjc