CVE-2006-6421

6.0 MEDIUM 16% exploit odds No fix listed XSS Web app

What it is

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.

At a glance

Exploitability: Can be exploited over the network with a login. Limited direct impact.
Exploit odds: 16.1% chance of exploitation in the next 30 days (EPSS). Higher than most.
Fix: No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

2006-12-10 11:28 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-16 22:33 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 16.1% in the next 30 days (EPSS).
Severity: 6.0 MEDIUM (CVSS).
Fix: none linked yet, which raises it.

Details

Published: 2006-12-10 11:28 UTC
Last modified: 2026-06-16 22:33 UTC
Exploit probability: 16.1% · EPSS, next 30 days
Record status: Modified

Affected

Phpbb Group Phpbb 2.0
Phpbb Group Phpbb 2.0.0
Phpbb Group Phpbb 2.0.1
Phpbb Group Phpbb 2.0.2
Phpbb Group Phpbb 2.0.3
Phpbb Group Phpbb 2.0.4
Phpbb Group Phpbb 2.0.5
Phpbb Group Phpbb 2.0.6

Attack profile CVSS 2.0 · 6.0

Attack vector: Network
Complexity: Medium
Authentication: Single
Confidentiality: Partial
Integrity: Partial
Availability: Partial

Raw vector

AV:N/AC:M/Au:S/C:P/I:P/A:P

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2006-6421.md and follow it. Check whether this project is affected by CVE-2006-6421. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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References

NVD record · CVE.org record