CVE-2026-54221
Medium
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.
SeverityMedium
CVSS5.1
Exploit probability—
ProductUBB.threads
PublishedJun 18, 2026
First seenJun 18, 2026
Weakness typeCWE-79Cross-site scripting (XSS)
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| UBB Systems UBB.threads | v ≤ 7.7.5 | — |
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