Arbitrary file upload in Chat Widget: Floating Customer Support Button For 30+ Channels, Supporting Sms, Calls, And
CVE-2026-16548
The Chat Widget: Floating Customer Support Button for 30+ Channels, Supporting SMS, Calls, and Chat WordPress plugin before 1.8.2 does not validate the type, extension, content, or size of files submitted to its public response endpoint and stores them under the uploads directory, so an unauthenticated user can upload arbitrary files. The original extension is discarded (files are stored under a bare UUID), so this does not yield code execution or stored XSS; impact is bounded to disk consumption and content hosting. The storing path requires the channel's response storage or mail-forwarding to be configured.
Vulnerability class: Unrestricted File Upload
EPSS: 0.004 (30.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L.
Affected products
- Unknown Chat Widget: Floating Customer Support Button For 30+ Channels, Supporting Sms, Calls, And — versions 0
Weakness classification (CWE)
References
- contact@wpscan.com (technical-description, exploit, vdb-entry)
Frequently asked questions
- What is CVE-2026-16548?
- CVE-2026-16548 is a medium-severity vulnerability in Chat Widget: Floating Customer Support Button For 30+ Channels, Supporting Sms, Calls, And, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 6.5/10. Published 2026-08-04.
- How severe is CVE-2026-16548?
- Medium severity. CVSS v3 base score is 6.5 out of 10.