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Langflow CVE-2025-34291

| EUVDEUVD-2025-201507 CRITICAL
Origin Validation Error (CWE-346)
2025-12-05 disclosure@vulncheck.com GHSA-577h-p2hh-v4mv
9.4
CVSS 4.0 · Vendor: vulncheck
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Severity by source

Vendor (vulncheck) PRIMARY
9.4 CRITICAL
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/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

Primary rating from Vendor (vulncheck) · only source for this CVE.

CVSS VectorVendor: vulncheck

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/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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
P
Scope
X

Lifecycle Timeline

9
Source Code Evidence Fetched
Jul 26, 2026 - 18:03 vuln.today
Severity Changed
May 21, 2026 - 20:22 NVD
HIGH CRITICAL
CVSS changed
May 21, 2026 - 20:22 NVD
8.8 (HIGH) 9.4 (CRITICAL)
Added to CISA KEV
May 21, 2026 - 19:31 CISA
EUVD ID Assigned
Mar 15, 2026 - 17:08 euvd
EUVD-2025-201507
Analysis Generated
Mar 15, 2026 - 17:08 vuln.today
PoC Detected
Jan 16, 2026 - 21:17 vuln.today
Public exploit code
CVE Published
Dec 05, 2025 - 23:15 cve.org
CRITICAL 9.4
CVE Published
Dec 05, 2025 - 23:15 nvd
HIGH 8.8

DescriptionCVE.org

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.

AnalysisAI

Account takeover and remote code execution in Langflow AI workflow platform versions ≤1.6.9 due to a CORS misconfiguration (allow_origins='*' with credentials) and a SameSite=None refresh token cookie. An attacker controlling a malicious webpage can steal authentication tokens and gain full access, including built-in code execution, leading to complete system compromise. This vulnerability is confirmed actively exploited (CISA KEV), with publicly available exploit code and a high EPSS score (17.62%), indicating widespread attack likelihood.

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9.8 Apr 07

Langflow before 1.3.0 allows unauthenticated remote code injection through the /api/v1/validate/code endpoint, enabling

CVE-2026-0770 CRITICAL POC
9.8 Jan 23

Langflow has a third RCE vulnerability via exec_globals (EPSS 10.0%) allowing inclusion of untrusted code that executes

CVE-2026-27966 CRITICAL POC
9.8 Feb 26

Code injection in Langflow CSV Agent node before 1.8.0. The node hardcodes allow_dangerous_code=True, enabling arbitrary

CVE-2024-48061 CRITICAL POC
9.8 Nov 04

langflow <=1.0.18 is vulnerable to Remote Code Execution (RCE) as any component provided the code functionality and the

CVE-2024-42835 CRITICAL POC
9.8 Oct 31

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CVE-2024-37014 CRITICAL POC
9.8 Jun 10

Langflow through 0.6.19 allows remote code execution if untrusted users are able to reach the "POST /api/v1/custom_compo

CVE-2026-21445 CRITICAL POC
9.1 Jan 02

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CVE-2024-7297 HIGH POC
8.8 Jul 30

Langflow versions prior to 1.0.13 suffer from a Privilege Escalation vulnerability, allowing a remote and low privileged

CVE-2026-0768 CRITICAL
9.8 Jan 23

Langflow has a code injection vulnerability in the code component (EPSS 2.6%) enabling remote code execution through the

CVE-2026-0769 CRITICAL
9.8 Jan 23

Langflow has an eval injection in eval_custom_component_code (EPSS 2.0%) enabling remote code execution through crafted

CVE-2026-10134 CRITICAL
10.0 Jun 30

Remote code execution in IBM Langflow OSS 1.0.0 through 1.9.3 lets an unauthenticated attacker inject and run arbitrary

CVE-2026-13448 CRITICAL
9.8 Jul 17

Unauthenticated remote code execution in IBM Langflow OSS versions 1.0.0 through 1.10.1 lets anonymous attackers run arb

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CVE-2025-34291 vulnerability details – vuln.today

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