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CVE-2026-42235

n8n is an open source workflow automation platform. Prior to versions 1.123.32, 2.17.4, and 2.18.1, an unauthenticated attacker could register a malicious MCP OAuth client with a crafted client_name. If a victim user authorized the OAuth consent dialog and a second user subsequently revoked that access, a toast notification would render the injected script. Clicking the link would execute arbitrary JavaScript in the victim's authenticated n8n browser session, enabling credential and session toke
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:9fb70f513cd7eb37afba651e686bd1ba4fb0bad16962b35ff403adfce805c346
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-87","description":"CWE-87: Improper Neutralization of Alternate XSS Syntax","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:1c3c1b0d9e0911e21ac18ff605914f3dedcf89508220cd6f47338e10e4efa126 · sha256:861c6d5731717c39… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-79","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:1c3c1b0d9e0911e21ac18ff605914f3dedcf89508220cd6f47338e10e4efa126 · sha256:861c6d5731717c39… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"product":"n8n","vendor":"n8n-io","versions":[{"status":"affected","version":"< 1.123.32"},{"status":"affected","version":">= 2.17.0, < 2.17.4"},{"status":"affected","version":">= 2.18.0, < 2.18.1"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:1c3c1b0d9e0911e21ac18ff605914f3dedcf89508220cd6f47338e10e4efa126 · sha256:861c6d5731717c39… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":8.8,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"LOW","subConfidentialityImpact":"HIGH","subIntegrityImpact":"HIGH","userInteraction":"ACTIVE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:1c3c1b0d9e0911e21ac18ff605914f3dedcf89508220cd6f47338e10e4efa126 · sha256:861c6d5731717c39… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

2 source assertions
{"cweId":"CWE-87","description":"CWE-87: Improper Neutralization of Alternate XSS Syntax","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:1c3c1b0d9e0911e21ac18ff605914f3dedcf89508220cd6f47338e10e4efa126 · sha256:861c6d5731717c39… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-79","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:1c3c1b0d9e0911e21ac18ff605914f3dedcf89508220cd6f47338e10e4efa126 · sha256:861c6d5731717c39… · /containers/cna/problemTypes/1/descriptions/0

Source references

1 source assertion
{"name":"https://github.com/n8n-io/n8n/security/advisories/GHSA-537j-gqpc-p7fq","tags":["x_refsource_CONFIRM"],"url":"https://github.com/n8n-io/n8n/security/advisories/GHSA-537j-gqpc-p7fq"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:1c3c1b0d9e0911e21ac18ff605914f3dedcf89508220cd6f47338e10e4efa126 · sha256:861c6d5731717c39… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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