CVE-2026-54221CWE-79

Reflected XSS in UBB.threads

Medium · published June 18, 2026

CVSS v4.0
5.1
EPSS
0%
Percentile
38.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
5.1 · MEDIUM
Vector
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
EPSS
0.00453 · 38.4th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-06-18T12:56Z
EPSS history
Timeline
  • 18 JUN 12:56Z
    Reflected XSS in UBB.threads
    cvelistv5