CVE-2026-110774

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.

References

• https://github.com/blinkospace/blinko
• https://github.com/blinkospace/blinko/blob/178e4b3538a21823a50ac2481e653d56cb1ffa86/server/routerExpress/file/file.ts#L148
• https://hackmd.io/@hieuPenguinnn/blinko-attachment-accountid-idor
• https://www.vulncheck.com/advisories/blinko-through-1.8.8-private-attachment-read-via-api-file-route