CVE-2026-25728 | THREATINT

Description

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.

PUBLISHED Reserved 2026-02-05 | Published 2026-02-10 | Updated 2026-02-11 | Assigner GitHub_M

CRITICAL: 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

Problem types

CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition

Product status

< 5.5.3 - #40

affected

References

github.com/...ket-v5/security/advisories/GHSA-xq7c-m5r2-9wqj exploit

github.com/...ket-v5/security/advisories/GHSA-xq7c-m5r2-9wqj

github.com/...ommit/09536e6e2ca6d69a2ee83190b588c0b8116dd16d

cve.org (CVE-2026-25728)

nvd.nist.gov (CVE-2026-25728)

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