Vulnerability details

CVE-2026-85671

netease-youdao QAnything

QAnything 2.0.0 Unauthenticated Cross-User File Disclosure

CVSS 4.0

8.7High

Official 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 scores

Score	Version	Source	Vector
8.7High	4.0	CVEProject cvelistV5 (CNA) (VulnCheck)	`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`
7.5High	3.1	CVEProject cvelistV5 (CNA) (VulnCheck)	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`

Affected products

Vendor	Product	Versions	Source
netease-youdao	QAnything	v ≤ 2.0.0	CVEProject cvelistV5 (CNA)

References and advisories

https://github.com/netease-youdao/QAnything/issues/670 issue-tracking
https://github.com/netease-youdao/QAnything product
https://github.com/netease-youdao/QAnything/blob/v2.0.0/qanything_kernel/qanything_server/handler.py technical-description
https://www.vulncheck.com/advisories/qanything-2.0.0-unauthenticated-cross-user-file-disclosure third-party-advisory

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Details

Published: 2026-09-04
Last updated: 2026-09-14
State: Published
Assigner (CNA): VulnCheck

Exploit prediction (EPSS)

0.64%

Probability of exploitation in 30 days

51%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: Yes
Exploitation: None
Technical impact: Partial

Weaknesses (CWE)

CWE-306
Missing Authentication for Critical Function