Bit Assist <= 1.8.1 — Unauthenticated Arbitrary File Upload
CVE-2026-16548Published · Updated Action summary
Affected: ≤1.8.1Update to 1.8.2 or newer
All remediation steps- Severity
- Critical9.8
- CVSS
- 9.8CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:NPrivileges required- None
UI:NUser interaction- None
S:UScope- Unchanged
C:HConfidentiality- High
I:HIntegrity- High
A:HAvailability- High
- Weakness
- CWE-434 Arbitrary File Upload
- Required access
- No account needed
- Exploit prediction (EPSS)
- No score
- CISA KEV
- Not listed
On this page8
Am I affected?
- Affected≤ 1.8.1
- Patched in1.8.2
Update to 1.8.2 or newer.
You are affected if you run ≤ 1.8.1. Version 1.8.2 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Chat Widget: Floating Customer Support Button for 30+ Channels, Supporting SMS, Calls, and Chat – Bit Assist.
- No admin access? Run a passive check of your site. It reads public files only.
- No account is needed to exploit this. Treat any exposed site on an affected version as at risk.
What to do
- Update to version 1.8.2, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch Chat Widget: Floating Customer Support Button for 30+ Channels, Supporting SMS, Calls, and Chat – Bit Assist to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to Vaibhav Narkhede.
The Bit Assist plugin for WordPress is vulnerable to Arbitrary File Upload in versions up to, and including, 1.8.1. This is due to missing file type validation in the file upload handler, allowing any file extension to be stored without checking against a blocklist or WordPress MIME allowlist. This makes it possible for unauthenticated attackers to upload arbitrary files, including executable PHP scripts, to the server and achieve remote code execution.
Exploits & references
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Related CVEs
More in Chat Widget: Floating Customer Support Button for 30+ Channels, Supporting SMS, Calls, and Chat – Bit Assist
All 9| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium4.4 | Authenticated (Admin+) Stored Cross-Site Scripting ≤1.7.1Update to 1.7.2 | CVE-2026-39070 | |
| Medium5.3 | Missing Authorization ≤1.5.11Update to 1.6.0 | CVE-2025-68596 | |
| Medium5.8 | Unauthenticated Path Traversal ≤1.5.4Update to 1.5.5 | CVE-2025-30834 | |
| Medium6.5 | Path Traversal to Authenticated (Subscriber+) Arbitrary File Read via fileID Parameter ≤1.5.2Update to 1.5.3 | CVE-2025-0822 | |
| Medium4.9 | Path Traversal to Authenticated (Administrator+) Arbitrary File Read via downloadResponseFile Function ≤1.5.2Update to 1.5.3 | CVE-2024-13791 |
- Medium4.4Authenticated (Admin+) Stored Cross-Site Scripting
≤1.7.1Update to 1.7.2
- Medium5.3Missing Authorization
≤1.5.11Update to 1.6.0
- Medium5.8Unauthenticated Path Traversal
≤1.5.4Update to 1.5.5
- Medium6.5Path Traversal to Authenticated (Subscriber+) Arbitrary File Read via fileID Parameter
≤1.5.2Update to 1.5.3
- Medium4.9Path Traversal to Authenticated (Administrator+) Arbitrary File Read via downloadResponseFile Function
≤1.5.2Update to 1.5.3
Same weakness (Arbitrary File Upload)
All Arbitrary File Upload| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| High7.2 | Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header | CVE-2026-120688 | |
| Critical9.8 | Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission | CVE-2026-125055 | |
| Critical9.8 | Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter | CVE-2026-119077 | |
| Medium5.3 | Unauthenticated Sensitive Information Exposure in 'search' Parameter | CVE-2026-121518 |
- High7.2Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header
EZ SQL Reports Shortcode Widget and DB Backup
≤5.25.25Update to 5.26.45
- Critical9.8Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission
Chatterbug Forms – Fast, Flexible WordPress Form Builder
≤1.0.2Update to 1.1
- Critical9.8Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter
ELEX WordPress HelpDesk & Customer Ticketing System
≤3.3.9Update to 3.4.0
- Medium5.3Unauthenticated Sensitive Information Exposure in 'search' Parameter
Customer Reviews for WooCommerce
≤5.127.0Update to 5.128.0
Timeline
CVE published
Severity critical, CVSS 9.8
Record last updated
Sources & licenses
Wordfence record- Vulnerability data
- Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
- CVE® identifiers
- Copyright 1999-2026 The MITRE Corporation. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
- CVSS / CWE
- National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.