Stored XSS in UBB.threads
Priority LOW 23CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- Passive
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- None · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00293 22nd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| UBB Systems | UBB.threads | up to 7.7.5 | — | No fix listed | CNA |
- UBB.threads VendorUBB Systems Affected up to 7.7.5 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-54219
- 2026-10-03 Alias added: GHSA-mxqw-8v8m-qpmf
References
More UBB Systems vulnerabilities
- TI-2026-39127 Remote Code Execution via arbitrary file read and write in UBB.threads CVSS 4.0HIGH 8.6
- TI-2026-39126 Blind SQL Injection in UBB.threads CVSS 4.0HIGH 8.6
- TI-2026-39124 Cross-Site Request Forgery in UBB.threads CVSS 4.0HIGH 8.6
- TI-2026-39128 Denial of Service in UBB.threads CVSS 4.0HIGH 7.1
- TI-2026-39125 Reflected XSS in UBB.threads CVSS 4.0MEDIUM 5.1
Sources
- CVE-2026-54219 · CVE Program
- CVE-2026-54219 · NVD
- FIRST EPSS
- GHSA-mxqw-8v8m-qpmf · GitHub Advisory Database · CC BY 4.0
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