Cross-site scripting (XSS) vulnerability in ViewTopic.php in phpBB, possibly 2.0.6c and earlier, allows remote attackers to execute arbitrary script or HTML as other users via the postorder parameter.
Conclusion & alert: CVE-2004-0339 is rated Moderate Risk (51.6/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.36%). Mandatory action: Review affected assets and schedule remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-06-15 | 0.83% | 1.36% | +0.53% |
| 2 | 2025-03-30 | 0.63% | 0.83% | +0.20% |
| 3 | 2025-03-29 | — | 0.63% | — |
Full EPSS history (6 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 6.8 | 2.0 | MEDIUM |
|
8.6 | 6.4 | [email protected] |
: This vulnerability is addressed in the following product release: phpBB Group, phpBB, 2.0.7
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| phpbb_group | phpbb | 2.0 | cpe:2.3:a:phpbb_group:phpbb:2.0:*:*:*:*:*:*:* |
| phpbb_group | phpbb | 2.0.1 | cpe:2.3:a:phpbb_group:phpbb:2.0.1:*:*:*:*:*:*:* |
| phpbb_group | phpbb | 2.0.2 | cpe:2.3:a:phpbb_group:phpbb:2.0.2:*:*:*:*:*:*:* |
| phpbb_group | phpbb | 2.0.3 | cpe:2.3:a:phpbb_group:phpbb:2.0.3:*:*:*:*:*:*:* |
| phpbb_group | phpbb | 2.0.4 | cpe:2.3:a:phpbb_group:phpbb:2.0.4:*:*:*:*:*:*:* |
| phpbb_group | phpbb | 2.0.5 | cpe:2.3:a:phpbb_group:phpbb:2.0.5:*:*:*:*:*:*:* |
| phpbb_group | phpbb | 2.0.6 | cpe:2.3:a:phpbb_group:phpbb:2.0.6:*:*:*:*:*:*:* |
| phpbb_group | phpbb | 2.0.6c | cpe:2.3:a:phpbb_group:phpbb:2.0.6c:*:*:*:*:*:*:* |
| phpbb_group | phpbb | 2.0_rc4 | cpe:2.3:a:phpbb_group:phpbb:2.0_rc4:*:*:*:*:*:*:* |