CVE-2026-54221— Reflected XSS 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及之前版本存在跨站脚本漏洞，该漏洞源于对特定请求中用户输入处理不当，可能导致攻击者通过诱骗受害者点击特制链接，在受害者浏览器环境中执行任意JavaScript。
Possible ATT&CK Techniques 2 AI
T1059 · Command and Scripting Interpreter T1189 · Drive-by CompromiseAffected 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-2026-54221
Vulnerability Information
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Vulnerability Title
Reflected XSS in UBB.threads
Source: CVE Program / CVE List V5
Vulnerability Description
UBB.threads is vulnerable to Reflected XSS. The application improperly handles user input in certain requests, enabling attackers to execute arbitrary JavaScript in the context of a victim's browser by tricking them into clicking a crafted link.
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:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
UBB Systems UBB.threads 跨站脚本漏洞
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及之前版本存在跨站脚本漏洞，该漏洞源于对特定请求中用户输入处理不当，可能导致攻击者通过诱骗受害者点击特制链接，在受害者浏览器环境中执行任意JavaScript。
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-2026-54221
| # | POC Description | Source Link | Shenlong Link |
|---|
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Security Blog Posts for CVE-2026-54221 (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-2026-54222 | Blind SQL Injection in UBB.threads | |
| CVE-2026-54219 | Stored XSS in UBB.threads | |
| CVE-2026-54223 | Remote Code Execution via arbitrary file read and write in UBB.threads | |
| CVE-2026-54220 | Cross-Site Request Forgery in UBB.threads |
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V. Comments for CVE-2026-54221
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