Auth bypass in Netease-Youdao Qanything
CVE-2026-85671
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.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.006 (49.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 49.8% 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: +0.003
Affected products
Weakness classification (CWE)
References
- github.com/netease-youdao/QAnything (product)
- github.com/netease-youdao/QAnything/blob/v2.0.0/qanything_kernel/qanything_serv… (technical-description)
- github.com/netease-youdao/QAnything/issues/670 (issue-tracking)
- www.vulncheck.com/advisories/qanything-2.0.0-unauthenticated-cross-user-file-di… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-85671?
- CVE-2026-85671 is a high-severity vulnerability in Netease-Youdao Qanything, classified under Missing Authentication for Critical Function. CVSS score: 7.5/10. Published 2026-09-04.
- How severe is CVE-2026-85671?
- High severity. CVSS v3 base score is 7.5 out of 10.