Auth bypass in Marceauka Shaark
CVE-2026-109568
Shaark 1.2.13 through 1.2.44 contains a missing authorization vulnerability in the Link, Story, Chest and Album API controllers that skips ownership checks. Authenticated non-admin users can send PUT or DELETE requests to /api/{link,story,chest,album}/{id} with numeric IDs to overwrite or delete other users' content, including private items.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L.
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
- github.com/MarceauKa/shaark/pull/110 (issue-tracking, patch)
- github.com/MarceauKa/shaark/blob/1.2.44/app/Http/Controllers/Api/LinkController… (technical-description)
- github.com/MarceauKa/shaark (product)
- www.vulncheck.com/advisories/shaark-1.2.13-through-1.2.44-missing-authorization… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-109568?
- CVE-2026-109568 is a high-severity vulnerability in Marceauka Shaark, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 7.1/10. Published 2026-10-12.
- How severe is CVE-2026-109568?
- High severity. CVSS v3 base score is 7.1 out of 10.