CVE-2026-21445
HighExploitedLangflow Missing Authentication on Critical API Endpoints
Published Jan 2, 2026 · Updated Aug 12, 2026 · Also known as GHSA-c5cp-vx83-jhqx, PYSEC-2026-1524, PYSEC-2026-2571
Key Facts
Patch immediately- CVE-2026-21445 is a high-severity vulnerability (CVSS 8.8 v4) affecting Langflow, langflow-base (pypi).
- It is exploited in the wild, listed in Industry KEV feed since Apr 9, 2026. No public exploit code is known.
- EPSS estimates a 33% probability of exploitation in the next 30 days.
- Fixed versions are available, including Langflow 1.7.1, langflow-base 0.7.1.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v4
8.8
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/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
EPSS (30-day exploit likelihood)
33%
Higher than 98.3% of all scored CVEs
Exploited in the wild
Yes
1 catalog listing
Public exploit code
None known
Get the full CVE-2026-21445 brief as a PDF
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Description
Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to version 1.7.0.dev45, multiple critical API endpoints in Langflow are missing authentication controls. The issue allows any unauthenticated user to access sensitive user conversation data, transaction histories, and perform destructive operations including message deletion. This affects endpoints handling personal data and system operations that should require proper authorization. Version 1.7.0.dev45 contains a patch.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Apr 9, 2026 | n/a | Not reported |
Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Affected Products
4 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| LangflowLangflow | >= < 1.7.0.dev45 | 1.7.1 |
| langflow-basepypi | See advisory | 0.7.1 |
Patched Releases
Langflow
1.7.1
langflow-base
0.7.1
Timeline
Publicly disclosed
Jan 2, 2026
Added to Industry KEV feed
Apr 9, 2026
Last updated
Aug 12, 2026
Weakness Type
- CWE-306 Missing Authentication for Critical Function
References
- advisoryGHSA advisory
- advisoryhttps://github.com/CVEProject/cvelistV5/tree/main/cves/2026/21xxx/CVE-2026-21445.json
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2026-21445
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
Langflow is a tool for building and deploying AI-powered agents and workflows.
Affected: Langflow versions >= < 1.7.0.dev45; langflow-base (pypi). The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Apr 9, 2026.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including Langflow 1.7.1, langflow-base 0.7.1.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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