CVE-2026-28288: Dify has a user enumeration issue

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-02-27 · updated 2026-06-17
Weakness: CWE-204

Description

Dify is an open-source LLM app development platform. Prior to 1.9.0, responses from the Dify API to existing and non-existent accounts differ, allowing an attacker to enumerate email addresses registered with Dify. Version 1.9.0 fixes the issue.

Affected products

Dify: before 1.9.0 — fixed in 1.9.0

How to fix

Upgrade to a fixed version: Dify 1.9.0. Check the vendor advisory for mitigations.

References

https://github.com/langgenius/dify/issues/24323
https://github.com/langgenius/dify/security/advisories/GHSA-9qpf-wcv3-w3qx

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