netdisk-fast-download through 0.4.8 Credential Disclosure via /v2/randomAuth

Advisories

netdisk-fast-download through 0.4.8 Credential Disclosure via /v2/randomAuth

Severity: high
Date: 10/16/2026
Affecting: netdisk-fast-download <= 0.4.8
CVE: CVE-2026-111612
CWE: CWE-321 Use of Hard-coded Cryptographic Key
CVSS: 8.7
CVSS V4 Vector: 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
References: https://hackmd.io/@hieuPenguinnn/netdisk-fast-download-randomauth-donated-credential-disclosure
https://github.com/qaiu/netdisk-fast-download/blob/v0.4.8/web-service/src/main/java/cn/qaiu/lz/web/controller/ParserApi.java#L738-L752
https://github.com/qaiu/netdisk-fast-download/blob/v0.4.8/web-service/src/main/java/cn/qaiu/lz/common/util/AuthParamCodec.java#L31
https://github.com/qaiu/netdisk-fast-download
Credit: hieuPenguinnn
Description: netdisk-fast-download through 0.4.8 contains an information disclosure vulnerability that allows unauthenticated attackers to retrieve donated netdisk credentials via the /v2/randomAuth endpoint in ParserApi. Attackers can repeatedly call the endpoint and decrypt the encryptedAuth blob using the hard-coded AES key nfd_auth_key2026 to recover other users' cloud-drive cookies, tokens, or passwords.

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