CVE-2026-54221
MEDIUM EPSS 20.9%
Published Jun 18, 20261w ago · Modified Jun 18, 20261w ago
5.1 CVSS 4.0
Published Jun 18, 2026 1w ago
Last Modified Jun 18, 2026 1w ago
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.
CVSS Details
Base Score
Exploitability
Impact
Vector string
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction A
Scope X
Threat Intelligence
EPSS Exploit Probability
20.9% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-79 Cross-site Scripting Injection
References 2
- cert.pl https://cert.pl/en/posts/2026/06/CVE-2026-54219
- ubbcentral.com https://www.ubbcentral.com/
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.