Auth bypass in Blinkospace Blinko
CVE-2026-110774
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.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- hackmd.io/@hieuPenguinnn/blinko-attachment-accountid-idor (technical-description, exploit)
- github.com/blinkospace/blinko/blob/178e4b3538a21823a50ac2481e653d56cb1ffa86/ser… (technical-description)
- github.com/blinkospace/blinko (product)
- www.vulncheck.com/advisories/blinko-through-1.8.8-private-attachment-read-via-a… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-110774?
- CVE-2026-110774 is a medium-severity vulnerability in Blinkospace Blinko, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 5.3/10. Published 2026-10-14.
- How severe is CVE-2026-110774?
- Medium severity. CVSS v3 base score is 5.3 out of 10.