What is CVE-2026-41949?

CVE-2026-41949 is a medium-severity vulnerability in Dify, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 5.9/10. Published 2026-05-18.

How severe is CVE-2026-41949?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Auth bypass in Dify

CVE-2026-41949

Dify before version 1.14.2 contains an authorization bypass vulnerability in the file preview endpoint that allows any authenticated user to read up to 3,000 characters of any uploaded document across all tenants and workspaces using only the file's UUID. Attackers can access the /console/api/files/{file_id}/preview endpoint with an intercepted file UUID to extract sensitive content from documents without ownership or workspace permission verification. NOTE: Dify Cloud allows unauthenticated free self-registration, making account creation trivially accessible to any attacker.

Vulnerability class: IDOR (Insecure Direct Object Reference)

Published 2026-05-18 · last modified 2026-06-22.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.006 (44.8th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 44.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.006 · change: +0.001

Affected products

Dify
Langgenius Dify — versions 0

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

huntr.com/bounties/d50a0240-7951-4939-b989-9bded66c7682 (Exploit, technical-description, Third Party Advisory, exploit)
github.com/langgenius/dify/pull/35797 (issue-tracking, Patch, Mitigation, patch, Issue Tracking)
www.vulncheck.com/advisories/dify-authorization-bypass-via-file-preview-endpoint (Third Party Advisory, third-party-advisory)
github.com/langgenius/dify/releases/tag/1.14.2 (release-notes)
github.com/langgenius/dify/commit/432a6412a3fdb30ce48003d699b90cc7d890df20 (patch)
www.zafran.io/resources/difytap-zafran-discovers-how-attackers-can-silently-wir… (technical-description, exploit)

Frequently asked questions

What is CVE-2026-41949?: CVE-2026-41949 is a medium-severity vulnerability in Dify, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 5.9/10. Published 2026-05-18.
How severe is CVE-2026-41949?: Medium severity. CVSS v3 base score is 5.9 out of 10.