Security readout for executives and security teams
Plain-English summary
CVE-2025-3248 is a critical Langflow flaw allowing unauthenticated remote code execution through the /api/v1/validate/code endpoint. If exposed, an attacker may run code on the server without logging in. CISA lists it in KEV, so treat internet-exposed Langflow as urgent.
Executive priority
Immediate action is warranted for any exposed Langflow deployment. This is a critical unauthenticated RCE with confirmed KEV status, meaning exploitation in the wild is recognized by CISA. Patch and reduce exposure before routine change windows where possible.
Technical view
Langflow versions before 1.3.0 are reported vulnerable to code injection in /api/v1/validate/code. The CVSS 3.1 score is 9.8: network-accessible, low complexity, no privileges, no user interaction, with high confidentiality, integrity, and availability impact. The weakness is mapped to CWE-306, missing authentication for a critical function.
Likely exposure
Highest exposure is any Langflow instance reachable from the internet or untrusted networks, especially versions before 1.3.0. Internal-only deployments still matter if attackers can reach them after phishing, VPN compromise, or lateral movement.
Exploitation context
Active exploitation is supported by CISA KEV listing. Public research and third-party advisory material describe the vulnerable endpoint and unauthenticated RCE condition. Do not assume obscurity or authentication protects affected exposed services.
Researcher notes
The source bundle supports Langflow before 1.3.0, endpoint /api/v1/validate/code, unauthenticated remote code execution, CVSS 9.8, CWE-306, and KEV status. The provided affected-version metadata is sparse, so rely on vendor release notes and advisories when scoping exact package versions.
Mitigation direction
- Upgrade Langflow to version 1.3.0 or later per vendor release guidance.
- Remove public internet exposure for Langflow unless explicitly required.
- Restrict Langflow access to trusted networks, VPN, or authenticated gateways.
- Review vendor guidance and advisories for any additional hardening steps.
- Prioritize incident review for previously internet-exposed vulnerable instances.
Validation and detection
- Inventory all Langflow deployments, including containers, developer systems, and cloud workloads.
- Confirm installed Langflow versions and identify any below 1.3.0.
- Check whether /api/v1/validate/code is reachable from untrusted networks.
- Review access logs for suspicious unauthenticated requests to the vulnerable endpoint.
- Verify patched systems are no longer running vulnerable versions.
Public sources used
Michael Williams reviewed this cited source version on .
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-306: Credential and account abuse lookup
Authentication and credential weaknesses can make valid-account abuse and credential telemetry useful review starting points. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2025-3248 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CISA KEV status
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9VulnCheckVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- Added to KEVCISA-ADP
CISA Known Exploited Vulnerabilities metadata lists this CVE as known exploited.
- ADP timelineCISA-ADP
CVE-2025-3248 added to CISA KEV
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
- 2025-05-05T00:00:00.000Z: CVE-2025-3248 added to CISA KEV
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/langflow-ai/langflow/pull/6911CVE reference, VulnCheck · issue-tracking
- https://github.com/langflow-ai/langflow/releases/tag/1.3.0CVE reference, VulnCheck · release-notes
- https://www.horizon3.ai/attack-research/disclosures/unsafe-at-any-speed-abusing-python-exec-for-unauth-rce-in-langflow-ai/CVE reference, VulnCheck · exploit
- https://www.vulncheck.com/advisories/langflow-unauthenticated-rceCVE reference, VulnCheck · third-party-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-3248CVE reference, CISA-ADP · government-resource
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Missing Authentication for Critical Function
Missing Authentication for Critical Function represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.