CVE-2026-54219

Stored XSS in UBB.threads

MEDIUM
5.1
CVSS Score
Published: June 18, 2026 at 12:56 PM UTC
Updated: October 25, 2026 at 11:10 PM UTC
1 product affected across 1 vendorUBB.threads

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Severity
MEDIUM5.1
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

Description

UBB.threads is vulnerable to Stored XSS via user posts and user profile fields. The application fails to properly sanitize user input, allowing low privileged attackers to inject arbitrary JavaScript that executes in a victim's browser upon viewing. Because vendor contact attempts were unsuccessful, the vulnerability has only been confirmed in version 7.7.5 but may also affect other versions.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v ≤ 7.7.5

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (2)

Product
Source: cverecord
https://www.ubbcentral.com/
Third Party Advisory
Source: cverecord
https://cert.pl/en/posts/2026/06/CVE-2026-54219

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.1MEDIUMCERT-PL
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-79

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