CVE-2026-56359 json
n8n - Cross-Site Scripting in Credential Management OAuth2 Authorization URL
published 2026-03-27 7 mo ago modified 2026-10-29 10 d ago also GHSA-364x-8g5j-x2pr , EUVD-2026-42257
- cvss
- 5.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 15%
- public exploits
- 0
- none known
Summary
n8n before 2.8.0 contains a cross-site scripting vulnerability in the credential management flow where authenticated users can inject malicious JavaScript URLs into OAuth2 credential Authorization URL fields. Attackers can craft malicious credentials and trick victims into clicking the OAuth authorization button, executing arbitrary scripts in their browser session with the victim's privileges.
Patch / fix
- npm n8n 2.6.4, 2.8.0
- n8n n8n 2.6.4, 2.8.0
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 4 mo ago
Exploit prediction
0.24% chance of exploitation in the next 30 days, higher than 15% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 4.8 | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N |
| CNA | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
| CNA | 4.0 | 4.8 | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| GitHub | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | n8n | >=2.7.0, <2.8.0 <2.6.4 |
2.8.0 2.6.4 |
Affected products
- n8n n8n
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
github.com
/n8n-io/n8n/security/advisories/GHSA-364x-8g5j-x2pr
vendor-advisory, web, mitigation
-
vulncheck.com
/advisories/n8n-cross-site-scripting-in-credential-management-oauth2-authorization-url
third-party-advisory
-
github.com
/n8n-io/n8n
package
Sources
- CVE List CVE-2026-56359
- GitHub Advisory GHSA-364x-8g5j-x2pr
- NVD CVE-2026-56359
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