Security readout for executives and security teams
Plain-English summary
Langflow versions before 1.7.0.dev45 leave multiple critical API endpoints without authentication. An unauthenticated network user could view sensitive conversation and transaction data and delete messages. For organizations using Langflow with reachable APIs, this is a high-priority privacy and operational integrity issue.
Executive priority
Prioritize remediation for any reachable Langflow deployment, especially systems processing user conversations or transaction histories. The business risk is unauthorized data access and destructive message operations. Upgrade and exposure reduction should be handled promptly, but current sources do not confirm active exploitation.
Technical view
CVE-2026-21445 is a CWE-306 missing-authentication flaw in langflow-ai Langflow before 1.7.0.dev45. The CVSS 4.0 score is 8.8, with network access, low complexity, no privileges, and no user interaction. The advisory states affected endpoints handle personal data and system operations and should require authorization.
Likely exposure
Exposure is most likely where Langflow APIs are reachable by untrusted users, including internet-facing deployments or shared internal environments. The source bundle identifies Langflow versions earlier than 1.7.0.dev45 as affected. Evidence does not identify specific hosting configurations, package channels, or default exposure.
Exploitation context
The CVE data indicates exploitation is possible over the network without credentials or user interaction. The provided sources do not state active exploitation, and the CVE is not marked as CISA KEV in the bundle. Treat public or broadly accessible deployments as higher risk.
Researcher notes
Use the GitHub advisory and patch commit as primary references. The public description confirms multiple unauthenticated critical endpoints but does not enumerate all endpoint paths in the supplied bundle. Avoid assuming exploit activity, affected forks, or additional mitigations beyond vendor guidance and access restriction.
Mitigation direction
- Upgrade Langflow to version 1.7.0.dev45 or later.
- Restrict access to Langflow APIs until upgrade is complete.
- Review vendor advisory and commit for implementation-specific guidance.
- Inventory Langflow deployments, including development and internal AI workflow environments.
Validation and detection
- Confirm all Langflow instances report version 1.7.0.dev45 or later.
- Verify critical API endpoints require authentication and authorization.
- Review access logs for unauthenticated requests to sensitive API paths.
- Check whether any exposed deployment stored conversation or transaction data.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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 lookupCVE-2026-21445 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
- High
- CVSS
- 8.8 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:P
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.
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:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:P——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
8.8HighVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:P
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/langflow-ai/langflow/security/advisories/GHSA-c5cp-vx83-jhqxCVE reference · x_refsource_CONFIRM
- https://github.com/langflow-ai/langflow/commit/3fed9fe1b5658f2c8656dbd73508e113a96e486aCVE reference · x_refsource_MISC
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.