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Vulnerability record · CVE-2026-85671 · published 4 September 2026

CVE-2026-85671: Missing authentication for critical function vulnerability

QAnything 2.0.0 contains an authentication bypass vulnerability in the /api/local_doc_qa/get_file_base64 and /api/local_doc_qa/get_doc endpoints that allows unauthenticated attackers to access any uploaded file or document. Attackers can enumerate file identifiers through unauthenticated endpoints and retrieve base64-encoded files or parsed document chunks without ownership verification to disclose cross-tenant knowledge base content.

8.7 CVSS 4.0 High EPSS 0.64% · top 51.3% CWE-306 · Missing authentication for critical function Deferred
8.7CVSS 4.0 base score
0.64%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
23 Sep 2026Last modified by NVD

Description

QAnything 2.0.0 contains an authentication bypass vulnerability in the /api/local_doc_qa/get_file_base64 and /api/local_doc_qa/get_doc endpoints that allows unauthenticated attackers to access any uploaded file or document. Attackers can enumerate file identifiers through unauthenticated endpoints and retrieve base64-encoded files or parsed document chunks without ownership verification to disclose cross-tenant knowledge base content.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/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:

References

LinkTags
https://github.com/netease-youdao/QAnything
https://github.com/netease-youdao/QAnything/blob/v2.0.0/qanything_kernel/qanything_server/handler.py
https://github.com/netease-youdao/QAnything/issues/670
https://www.vulncheck.com/advisories/qanything-2.0.0-unauthenticated-cross-user-file-disclosure

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Source: NIST National Vulnerability Database (record CVE-2026-85671), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.