CVE-2026-6596: langflow-ai langflow Improper Access Control
Vulnerability summary
CVE-2026-6596 is a high (CVSS 7.5) Improper Access Control vulnerability in langflow-ai langflow. EPSS estimates a 0.47% chance of exploitation in the next 30 days, higher than 39.5% of scored vulnerabilities. 1 public exploit is recorded.
Timeline
- 20-04-2026PublishedVulnerability first disclosed.
- 20-04-2026Last modifiedVulnerability information updated.
Description
A security flaw has been discovered in langflow-ai langflow up to 1.1.0. This issue affects the function create_upload_file of the file src/backend/base/Langflow/api/v1/endpoints.py of the component API Endpoint. The manipulation results in unrestricted upload. It is possible to launch the attack remotely. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
CVSS metrics
9 scores · 3 sources · 4 versions- OSV · PypiEcosystem advisory · calculated6.9MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
- NVDNIST5.5MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/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:XDiffers
- OSV · PypiEcosystem advisory · calculated7.3HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
- NVDNIST7.3HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
- NVDNIST7.5HighAV:N/AC:L/Au:N/C:P/I:P/A:P
EPSS trend
Probability
0.47%
Chance of exploitation in the next 30 days
Percentile
40%
Versus all other CVEs
30-day change
+0.19 pp
From 0.28% on 20-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundC2Aabfdee41009Cfe45D28A9924742A0
Maturity: poc
Weaknesses
CWE · root cause- CWE-284Improper Access ControlThe product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
- CWE-434Unrestricted Upload of File with Dangerous TypeThe product allows the upload or transfer of dangerous file types that are automatically processed within its environment.
Affected systems
Langflow-ai1 product
- langflow1.0 | 1.1.0
PyPI1 product
- langflow-base< 0.9.1
2 vendors · 2 products
