CVE-2026-56356

n8n - Stored Cross-Site Scripting in Chat Trigger Node Custom CSS Field

CVSS 5.1 MEDIUMEPSS 0.2%CWE-79

Vexday Risk Score

13Baixo

Decisão SSVC (CISA)

Track

Sem sinal de exploração → monitorar

CVSS 5.1EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch referenciado

Ciclo de vida

30 jun 2026Publicada no NVD

Recomendação: Monitorar — sem sinal de exploração no momento.

n8n contains a stored cross-site scripting vulnerability in the Chat Trigger node's Custom CSS field due to a misconfiguration of the sanitize-html library. Affected releases are those before 1.123.27, the 2.0.0 through 2.13.2 line, and 2.14.0 (fixed in 1.123.27, 2.13.3, and 2.14.1). An authenticated user with permission to create or modify workflows can inject JavaScript that bypasses sanitization, resulting in stored XSS against any user who visits the public chat page.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N

Produtos afetados

n8n · n8n

Referências

https://github.com/n8n-io/n8n/security/advisories/GHSA-3c7f-5hgj-h279 https://www.vulncheck.com/advisories/n8n-stored-cross-site-scripting-in-chat-trigger-node-custom-css-field