Langflow <= 1.6.9 CORS Misconfiguration to Token Hijack & RCE
Langflow versions up to and including 1.6.9 contain a chained vulnerability that enables account takeover and remote code execution. An overly permissive CORS configuration (allow_origins='*' with allow_credentials=True) combined with a refresh token cookie configured as SameSite=None allows a malicious webpage to perform cross-origin requests that include credentials and successfully call the refresh endpoint. An attacker-controlled origin can therefore obtain fresh access_token / refresh_token pairs for a victim session. Obtained tokens permit access to authenticated endpoints — including built-in code-execution functionality — allowing the attacker to execute arbitrary code and achieve full system compromise.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2025-34291
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 05:54 UTC · Revision 1
Source evidence
Langflow <= 1.6.9 CORS Misconfiguration to Token Hijack & RCE
core-osv · Original sourcePublished 5 Dec 2025, 22:27 UTC
Langflow versions up to and including 1.6.9 contain a chained vulnerability that enables account takeover and remote code execution. An overly permissive CORS configuration (allow_origins='*' with allow_credentials=True) combined with a refresh token cookie configured as SameSite=None allows a malicious webpage to perform cross-origin requests that include credentials and successfully call the refresh endpoint. An attacker-controlled origin can therefore obtain fresh access_token / refresh_token pairs for a victim session. Obtained tokens permit access to authenticated endpoints — including built-in code-execution functionality — allowing the attacker to execute arbitrary code and achieve full system compromise.
osv:CVE-2025-34291
Complete source record
{
"id": "66b11e7d8e587e5628c9d8b4341195efcaedd133c596d222818657435ae9fe4a",
"url": "https://osv.dev/vulnerability/CVE-2025-34291",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Langflow <= 1.6.9 CORS Misconfiguration to Token Hijack & RCE",
"summary": "Langflow versions up to and including 1.6.9 contain a chained vulnerability that enables account takeover and remote code execution. An overly permissive CORS configuration (allow_origins='*' with allow_credentials=True) combined with a refresh token cookie configured as SameSite=None allows a malicious webpage to perform cross-origin requests that include credentials and successfully call the refresh endpoint. An attacker-controlled origin can therefore obtain fresh access_token / refresh_token pairs for a victim session. Obtained tokens permit access to authenticated endpoints — including built-in code-execution functionality — allowing the attacker to execute arbitrary code and achieve full system compromise.",
"evidence": "osv:CVE-2025-34291",
"products": [],
"severity": "critical",
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"aliases": [
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"GHSA-577h-p2hh-v4mv",
"PYSEC-2025-78"
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"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H"
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"database_specific": {
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],
"modified": "2026-10-28T02:30:26.437301823Z",
"provider": "osv",
"references": [
"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-34291",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/34xxx/CVE-2025-34291.json",
"https://nvd.nist.gov/vuln/detail/CVE-2025-34291",
"https://www.crowdsec.net/vulntracking-report/cve-2025-34291",
"https://www.vulncheck.com/advisories/langflow-cors-misconfiguration-to-token-hijack-and-rce",
"https://github.com/langflow-ai/langflow",
"https://www.obsidiansecurity.com/blog/cve-2025-34291-critical-account-takeover-and-rce-vulnerability-in-the-langflow-ai-agent-workflow-platform"
],
"provider_metadata": {
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"CWE-346"
],
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"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/34xxx/CVE-2025-34291.json"
}
},
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"evidence": "/id"
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"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 492879,
"published_at": "2025-12-05T22:27:26.438+00:00"
}