Auth bypass in Macwarrior Clipbucket-V5
CVE-2026-28354
ClipBucket v5 is an open source video sharing platform. Prior to version 5.5.3 #59, collection item operations are vulnerable to authorization flaws, allowing a normal authenticated user to modify another user’s collection items. This affects both add item (/actions/add_to_collection.php) due to missing authorization checks and delete item (/manage_collections.php?mode=manage_items...) due to a broken ownership check in removeItemFromCollection(). As a result, attackers can insert and remove items from collections they do not own. Version 5.5.3 #59 fixes the issue.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.003 (24.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 24.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000
Affected products
- Macwarrior Clipbucket-V5 — versions < 5.5.3 - #59
- Oxygenz Clipbucket
Weakness classification (CWE)
References
- github.com/MacWarrior/clipbucket-v5/security/advisories/GHSA-6wf8-rw5f-c9mv (Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-28354?
- CVE-2026-28354 is a medium-severity vulnerability in Macwarrior Clipbucket-V5, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.5/10. Published 2026-02-27.
- How severe is CVE-2026-28354?
- Medium severity. CVSS v3 base score is 6.5 out of 10.