HighPublic exploit

Authorization bypass in Dify file preview endpoint

IdentifiersCVE-2026-41949CWE-639· Authorization Bypass Through…

CVE-2026-41949 is an authorization bypass vulnerability affecting Dify before version 1.14.2, including version 1.14.1 and earlier. The flaw exists in the file preview endpoint at /console/api/files/{file_id}/preview. The endpoint verifies that the referenced object is a document but does not properly enforce ownership, tenant, or workspace authorization checks before returning preview data. As a result, any authenticated user who knows or can obtain a valid file UUID can request preview content for documents uploaded by other users, workspaces, or tenants. The exposed response is limited to approximately 3,000 characters of the target document, but this is sufficient to disclose sensitive content from otherwise inaccessible files.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation results in unauthorized disclosure of document contents across tenant and workspace boundaries. An attacker can read preview text from uploaded documents belonging to other users or customers without having legitimate access to those files. In multi-tenant deployments, this creates cross-tenant data exposure and can leak sensitive business information, internal documents, or regulated content. The issue is confidentiality-focused; the provided material does not indicate direct integrity or availability impact from this CVE.

Mitigation

If you can’t patch tonight, do this now.

Until patching is completed, restrict access to /console/api/files/{file_id}/preview using reverse-proxy controls, WAF rules, or network-layer filtering. Reduce exposure by limiting who can create console accounts, especially in environments where self-registration is enabled. Monitor for anomalous or high-volume requests to file preview endpoints, investigate access patterns involving UUID enumeration or reuse, and minimize sensitive document exposure in affected instances until remediation is deployed.

Remediation

Patch, then assume compromise.

Upgrade Dify to version 1.14.2 or later, which addresses CVE-2026-41949. If immediate upgrade is not possible, apply the vendor patch associated with the fix and verify that the file preview endpoint enforces file ownership, tenant isolation, and workspace permission checks before returning any preview content.

PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType

DifyDifyapplication

LanggeniusDifyapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

8 SOURCESView more in app

scworldNews

Jun 23, 2026

4 vulnerabilities in Dify expose cross-tenant data | brief | SC Media

A Dify vulnerability that permits any console user to preview any document, contributing to cross-tenant data exposure risk.

security affairsNews

Jun 23, 2026

DifyTap: Four Bugs Put over 1 million AI Apps at Risk - Security Affairs

A Dify file access vulnerability in the document preview endpoint that lacks ownership and tenant checks, allowing any console user to preview any document across the system.

security weekNews

Jun 23, 2026

Data Exposure Flaws Threaten Dify AI Platform Used by 1 Million Apps - SecurityWeek

A high-severity Dify file handling vulnerability related to file identification and access permissions that allows unauthorized preview of files uploaded by other tenants.

cyber security newsNews

Jun 23, 2026

DifyTap Flaws Allow Attackers to Wiretap AI Data Across Tenants - 1M+ Apps Impacted

A Dify vulnerability fixed in version 1.14.2; specific technical details are not provided in the content.

+3 more in the timeline

What this page doesn’t show

The version that knows your environment.

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity1

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES

MITRE CVE

cve.org · CVE-2026-41949

NVD

nvd.nist.gov/vuln/detail/CVE-2026-41949

MITRE CWE · CWE-639

Authorization Bypass Through User-Controlled Key

Patch

github.com/langgenius/dify/pull/35797

Third Party Advisory

huntr.com/bounties/d50a0240-7951-4939-b989-9bded66c7682

Third Party Advisory

vulncheck.com/advisories/dify-authorization-bypass-via-file-preview-endpoint

github.com

github.com/langgenius/dify/commit/432a6412a3fdb30ce48003d699b90cc7d890df20

github.com

github.com/langgenius/dify/releases/tag/1.14.2