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n8n Vulnerable to XSS via MCP OAuth client

🗓️ 29 Apr 2026 21:23:04Reported by GitHub Advisory DatabaseType 
github
 github
🔗 github.com👁 17 Views

An unauthenticated attacker can register a malicious authorization client; a toast XSS could steal credentials.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
attackerkb
ATTACKERKB
CVE-2026-42235
4 May 202618:38
attackerkb
bdu_fstec
BDU FSTEC
The vulnerability of the MCP OAuth component of the automation platform for N8n processes allows attackers to perform cross-site scripting attacks.
15 May 202600:00
bdu_fstec
circl
Circl
CVE-2026-42235
4 May 202621:11
circl
cnnvd
CNNVD
n8n 跨站脚本漏洞
4 May 202600:00
cnnvd
cve
CVE
CVE-2026-42235
4 May 202618:38
cve
cvelist
Cvelist
CVE-2026-42235 n8n: XSS via MCP OAuth client
4 May 202618:38
cvelist
euvd
EUVD
EUVD-2026-27110
4 May 202618:38
euvd
nvd
NVD
CVE-2026-42235
4 May 202619:16
nvd
osv
OSV
GHSA-537J-GQPC-P7FQ n8n Vulnerable to XSS via MCP OAuth client
29 Apr 202621:23
osv
ptsecurity
Positive Technologies
PT-2026-36905
29 Apr 202600:00
ptsecurity
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Vulners
Node
OR
n8nn8nRange2.17.02.17.4npm
n8nn8nRange2.18.02.18.1npm
n8nn8nRange<1.123.32npm

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08 May 2026 01:31Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.19.6
CVSS 48.8
EPSS0.00332
SSVC
17