by Kastro
Paper/Archive/CVE-2026-25728

CVE-2026-25728

MacWarrior clipbucket-v5 — ClipBucket v5 Affected by Remote Code Execution via Avatar/Background File Upload Race Condition

EPSS 0.3%public exploitCVSS 9.3
critical.is priorityof 100
43
CVSS 9.3 (CNA)9.3 / 10 × 3027.9Not in CISA KEV+300.0EPSS percentile 25.4.254 × 205.1Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

ClipBucket v5 is an open source video sharing platform. Prior to 5.5.3 - #40, a Time-of-Check to Time-of-Use (TOCTOU) race condition vulnerability exists in ClipBucket's avatar and background image upload functionality. The application moves uploaded files to a web-accessible location before validating them, creating a window where an attacker can execute arbitrary PHP code before the file is deleted. The uploaded file was moved to a web-accessible path via move_uploaded_file(), then validated via ValidateImage(). If validation failed, the file was deleted via @unlink(). This vulnerability is fixed in 5.5.3 - #40.

Affected

ProductAffectedFixed inSource
clipbucket-v5< 5.5.3 - #40–CNA

Scores by source

GitHub_M (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: total

References

exploitgithub.com/MacWarrior/clipbucket-v5/security/advisories/GHSA-xq7c-m5r2-9wqjrefgithub.com/MacWarrior/clipbucket-v5/commit/09536e6e2ca6d69a2ee83190b588c0b8116dd16d