Blinko through 1.8.8 Private Attachment Read via /api/file Route

Advisories

Blinko through 1.8.8 Private Attachment Read via /api/file Route

Severity: medium
Date: 10/14/2026
Affecting: blinko <= 1.8.8
CVE: CVE-2026-110774
CWE: CWE-639 Authorization Bypass Through User-Controlled Key
CVSS: 6.0
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
References: https://hackmd.io/@hieuPenguinnn/blinko-attachment-accountid-idor
https://github.com/blinkospace/blinko/blob/178e4b3538a21823a50ac2481e653d56cb1ffa86/server/routerExpress/file/file.ts#L148
https://github.com/blinkospace/blinko
Credit: hieuPenguinnn
Description: Blinko through 1.8.8 contains a broken access control vulnerability in the /api/file route that allows authenticated users to read other users' private attachments due to a flawed owner check. Attackers can supply another user's stored filename, following a basename plus millisecond-timestamp pattern, to download private, non-shared attachments.

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