CVE-2026-28288
MediumPublic exploitDify has a user enumeration issue
Published Feb 27, 2026 · Updated Aug 12, 2026 · Also known as GHSA-9qpf-wcv3-w3qx
Key Facts
Routine patching- CVE-2026-28288 is a medium-severity vulnerability (CVSS 5.5 v4) affecting Dify.
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 0.7% probability of exploitation in the next 30 days.
- Fixed versions are available, including Dify 1.9.0.
- Brandefense priority: routine patching, as no exploitation is known and its severity is moderate or low.
CVSS v4
5.5
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/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)
0.7%
Higher than 53.2% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2026-28288 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
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
2 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| DifyDify | >= < 1.9.0 | 1.9.0 |
Patched Releases
Dify
1.9.0
Timeline
Publicly disclosed
Feb 27, 2026
Last updated
Aug 12, 2026
Weakness Type
- CWE-204 Observable Response Discrepancy
References
FAQ
Common Questions.
Dify is an open-source LLM app development platform.
Affected: Dify versions >= < 1.9.0. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Dify 1.9.0.
Brandefense priority: routine patching, as no exploitation is known and its severity is moderate or low.
Is CVE-2026-28288 Running On Your Attack Surface?
Brandefense maps vulnerabilities like this one to your internet-facing assets and tells you exactly where to patch.
Request A Demo