CVE-2006-6421

CVE-2006-6421 is a medium-severity vulnerability in Phpbb Group Phpbb with a CVSS 2.0 base score of 6.0. Its EPSS exploit-prediction score of 15% places it in the 96th percentile, indicating an elevated likelihood of exploitation.

Key facts

Description

Cross-site scripting (XSS) vulnerability in the private message box implementation (privmsg.php) in phpBB 2.0.x allows remote authenticated users to inject arbitrary web script or HTML via the "Message body" field in a message to a non-existent user.

Frequently asked questions

What is CVE-2006-6421?
Cross-site scripting (XSS) vulnerability in the private message box implementation (privmsg.php) in phpBB 2.0.x allows remote authenticated users to inject arbitrary web script or HTML via the "Message body" field in a message to a non-existent user.
How severe is CVE-2006-6421?
CVE-2006-6421 has a CVSS 2.0 base score of 6.0, rated medium severity.
Is CVE-2006-6421 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 15% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2006-6421?
CVE-2006-6421 primarily affects Phpbb Group Phpbb. In total, 32 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2006-6421?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2006-6421 published?
CVE-2006-6421 was published on 2006-12-10 and last updated on 2026-06-16.

References

Affected products (32)

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