CVE-2026-54223— Remote Code Execution via arbitrary file read and write in UBB.threads
Quick assessment
Affected
UBB Systems UBB.threads
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
UBB Systems UBB.threads是UBB Systems社区的一个论坛软件系统。 UBB Systems UBB.threads 7.7.5及之前版本存在路径遍历漏洞，该漏洞源于容易受到路径遍历攻击，允许具有编辑模板权限的攻击者读取和写入应用程序服务器上有权访问的任何文件，导致远程代码执行。
Possible ATT&CK Techniques 2 AI
T1059 · Command and Scripting Interpreter T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| UBB Systems | UBB.threads | ≤ 7.7.5 |
affected |
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I. Basic Information for CVE-2026-54223
Vulnerability Information
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Vulnerability Title
Remote Code Execution via arbitrary file read and write in UBB.threads
Source: CVE Program / CVE List V5
Vulnerability Description
UBB.threads is vulnerable to Path traversal, allowing attackers with privilege to edit templates to read and write any file on the application’s server that application has privileges to, what results in Remote Code Execution.
Because vendor contact attempts were unsuccessful, the vulnerability has only been confirmed in version 7.7.5 but may also affect other versions.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
UBB Systems UBB.threads 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
UBB Systems UBB.threads是UBB Systems社区的一个论坛软件系统。 UBB Systems UBB.threads 7.7.5及之前版本存在路径遍历漏洞，该漏洞源于容易受到路径遍历攻击，允许具有编辑模板权限的攻击者读取和写入应用程序服务器上有权访问的任何文件，导致远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| UBB Systems | UBB.threads | 0 ~ 7.7.5 | - |
|
II. Public POCs for CVE-2026-54223
| # | POC Description | Source Link | Shenlong Link |
|---|
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Security Blog Posts for CVE-2026-54223 (1)
-
🔗 Vulnerabilities in UBB.threads software | CERT Polska third-party-advisory
Same Patch Batch · UBB Systems · 2026-06-18 · 6 CVEs total
| CVE-2026-54224 | Denial of Service in UBB.threads | |
| CVE-2026-54221 | Reflected XSS in UBB.threads | |
| CVE-2026-54222 | Blind SQL Injection in UBB.threads | |
| CVE-2026-54219 | Stored XSS in UBB.threads | |
| CVE-2026-54220 | Cross-Site Request Forgery in UBB.threads |
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V. Comments for CVE-2026-54223
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