Langflow Missing Authentication Vulnerability
Langflow versions prior to 1.3.0 are susceptible to code injection in the /api/v1/validate/code endpoint. A remote and unauthenticated attacker can send crafted HTTP requests to execute arbitrary code.
Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.
Exploitation probability EPSS · FIRST
Exploitation signals 5 / 5
- KEV catalog (CISA)05 May 2025
- Exploited in EUVD (ENISA)05 May 2025
- Used by ransomwareyes
- EPSS above 10 %99.99%
- No account, over the networkyes
What to do
Fix
Apply the vendor’s fix as soon as it is available.
CISA guidance: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Meanwhile
Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.
Manufacturers (CRA)
Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained
Affected products
- 0 <1.3.0
Open source packages OSV
Affected libraries according to OSV, with fixed versions.
Timeline
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Published
-
Exploitation reported (ENISA)
-
Added to the KEV catalog
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CISA remediation due date
-
EPSS peak: 99.99%
References
Other exploited vulnerabilities from the same vendor
- CVE-2026-0770Langflow Inclusion of Functionality from Untrusted Control Sphere Vulnerability8.2 · Actively exploited
- CVE-2026-55255Langflow Authorization Bypass Through User-Controlled Key Vulnerability4.6 · Actively exploited
- CVE-2025-34291Langflow Origin Validation Error Vulnerability8.9 · Actively exploited
- CVE-2026-33017Langflow Code Injection Vulnerability9.0 · Background exploitation