CVERadar
CRITICAL · CVSS 3.1 9.8CISA KEV · added 2025-05-05Metasploit moduleExploit-DBPublic PoCKnown ransomware useEPSS 99.99% (p100)Threat level 99

CVE-2025-3248: Langflow Missing Authentication Vulnerability

Langflow · Langflow · NVD published 2025-04-07 · posted 2026-10-21 · last modified 2026-10-08

What it is

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.

WeaknessCWE-306CWE-94
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H (source: [email protected])
CISA due date2025-05-26 (for US federal agencies under BOD; a good deadline for everyone)
ATT&CK tacticsExecution

Exploitation evidence

First exploit evidence seen: 2025-04-09 (earliest date across the sources below).

Exploited in the wild

  • CISA KEV: listed since 2025-05-05. Source

Public exploit code

Metasploit

Exploit-DB

  • EDB-52262: Langflow 1.3.0 - Remote Code Execution (RCE) (2025-04-18)
  • EDB-52364: Langflow 1.2.x - Remote Code Execution (RCE) (2025-07-16)

GitHub proof-of-concept repositories

28 public repositories from 28 accounts, first seen 2025-04-10. Most starred: ynsmroztas/CVE-2025-3248-Langflow-RCE (18 stars), view repository.

Verify before running: public PoCs can be malicious. Read the code and only run it in an isolated lab. A PoC means exploit code is public, not that this CVE is exploited in the wild.

Sources: CISA KEV · Rapid7 Metasploit Framework module metadata · Exploit-DB (OffSec) · nomi-sec/PoC-in-GitHub.

Defend the Chain

The attack chain for CVE-2025-3248 laid across the MITRE ATT&CK Enterprise tactics. Solid cards come from the MITRE CTID KEV mappings; dashed cards are inferred by CVERadar from the CWE or description. Correct defences are real ATT&CK mitigations for that technique.

Threat level 99/100
Defender level 1 · 0 XP
Chain links broken: 0/2

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Stealth

Defense Impairment

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Pick a red technique card on the board, then choose the defence that stops it.

Defend against T1203 Exploitation for Client Execution CTID: exploitation technique

Unauthenticated attackers have exploited this missing authentication vulnerability by sending crafted HTTP requests, allowing them to execute arbitrary code on the target Langflow server.

How to fix it

CISA 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. (source: CISA KEV)

Fixed versions

  • langflow langflow: upgrade to 1.3.0 or later

Derived from the NVD CPE configuration (versionEndExcluding / versionEndIncluding). Always confirm with the vendor advisory.

Vendor advisories and patches

MITRE ATT&CK mitigations for this chain

  • M1050 Exploit Protection (for T1203) : Security applications that look for behavior used during exploitation such as Windows Defender Exploit Guard (WDEG) and the Enhanced Mitigation Experience Toolkit (EMET) can be used to mitigate some exploitation behavior. Control flow integrity checking is another way to potentially identify and stop a software exploi
  • M1051 Update Software (for T1203) : Perform regular software updates to mitigate exploitation risk. Keeping software up-to-date with the latest security patches helps prevent adversaries from exploiting known vulnerabilities in client software, reducing the risk of successful attacks.
  • M1048 Application Isolation and Sandboxing (for T1203) : Browser sandboxes can be used to mitigate some of the impact of exploitation, but sandbox escapes may still exist. Other types of virtualization and application microsegmentation may also mitigate the impact of client-side exploitation. Risks of additional exploits and weaknesses in those systems may still exist.
  • M1033 Limit Software Installation (for T1059) : Prevent user installation of unrequired command and scripting interpreters.
  • M1045 Code Signing (for T1059) : Where possible, only permit execution of signed scripts.
  • M1042 Disable or Remove Feature or Program (for T1059) : Disable or remove any unnecessary or unused shells or interpreters.
  • M1038 Execution Prevention (for T1059) : Use application control where appropriate. For example, PowerShell Constrained Language mode can be used to restrict access to sensitive or otherwise dangerous language elements such as those used to execute arbitrary Windows APIs or files (e.g., `Add-Type`).
  • M1049 Antivirus/Antimalware (for T1059) : Anti-virus can be used to automatically quarantine suspicious files.
  • M1026 Privileged Account Management (for T1059) : When PowerShell is necessary, consider restricting PowerShell execution policy to administrators. Be aware that there are methods of bypassing the PowerShell execution policy, depending on environment configuration. PowerShell JEA (Just Enough Administration) may also be used to sandbox administration and limit what c
  • M1047 Audit (for T1059) : Inventory systems for unauthorized command and scripting interpreter installations.

Detection Generic guidance

  • Execution: Watch for the service process spawning shells or script interpreters (cmd.exe, powershell, sh, bash, python) via EDR process-tree rules.

Response checklist Generic guidance

  1. Inventory: find every instance of the affected product and version (include internet-facing and forgotten ones).
  2. Patch or mitigate per the vendor advisory; if you cannot patch, remove internet exposure or apply the vendor workaround.
  3. Assume compromise if the system was exposed before patching: hunt for the indicators in the advisory and review logs back to the disclosure date.
  4. Rotate credentials and secrets stored on or used by the affected system if compromise cannot be ruled out.

Sources