CVE-2025-34291

CVE Enrichment

CVSS: 9.4 CRITICAL
EPSS: 92.81%
EPSS Percentile: 99.83%
CISA KEV: YES — Known Exploited Vulnerability

Description

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.

Technical Details

CVSS Version: 4.0
CNA / NVD Source: [email protected]
Published: 06-Dec-2025 06:15
Last Modified: 16-Oct-2026 04:10
EPSS Date: 2026-10-30
CWE: CWE-346

CVSS Vector


            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

CISA KEV Details

Date Added: 2026-05-21
Remediation Due: 2026-06-04
Known Ransomware Campaign Use: Unknown
Required Action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Notes: This vulnerability could affect an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: https://github.com/langflow-ai/langflow ; https://github.com/langflow-ai/langflow/releases/tag/v1.9.3; https://github.com/langflow-ai/langflow/issues/11465#event-25774545848 ; https://nvd.nist.gov/vuln/detail/CVE-2025-34291

Affected Products / Versions

langflow / langflow Source: NVD CPE · affected
Version / affected range: * · through (inclusive) 1.6.9
cpe:2.3:a:langflow:langflow:*:*:*:*:*:*:*:*

References

Last enrichment sync: 31-Oct-2026 18:01
Sources: NVD · FIRST EPSS · CISA KEV
Latest successful provider update; providers refresh independently.

Reported Context (1)

The issue affects publicly exposed Langflow instances, and exploitation activity adds to a series of recent attacks against Langflow vulnerabilities, including CVE-2025-34291 used by MuddyWater. Unpatched Langflow CVE-2026-5027 Exploited in the Wild

CVE (4)

People (1)

Threat Actors (1)

MITRE ATT&CK (1)

Vendors (2)

Products (1)

Industries (1)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.