What’s Vulnerable › Vulnerabilities
CVE-2026-54221: Reflected XSS in UBB.threads
- Severity: medium (CVSS 5.1 v4.0)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-06-18 · updated 2026-10-26
- Weakness: CWE-79
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.
Affected products
- UBB Systems UBB.threads: through 7.7.5
References
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