CVE-2006-0155: Cross-site scripting (XSS) vulnerability in posts.php in 427BB 2.2 and 2.2.1 allows remote attackers to inject

Routine

MEDIUM 4.3DOWNGRADE

CVE-2006-0155 is a medium-severity flaw (CVSS 4.3) affecting fourtwosevenbb. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-site scripting (XSS) vulnerability in posts.php in 427BB 2.2 and 2.2.1 allows remote attackers to inject arbitrary Javascript via a new message with a url bbcode tag containing a javascript URI.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	4.3 (Medium)
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Published	2006-01-10
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: 427bb

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2006-01-10 11:03 UTCPublished CVE record published
2026-06-16 22:20 UTCUpdated Record last modified

427bb fourtwosevenbb DOWNGRADE

Affected: 2.2 · 2.2.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.2

1. Check installed version

apt-cache policy fourtwosevenbb || rpm -q fourtwosevenbb || fourtwosevenbb --version

2. No fixed release: DOWNGRADE to a release before 2.2 (Debian / Ubuntu)

apt-cache madison fourtwosevenbb sudo apt install fourtwosevenbb=<VERSION_BEFORE_2.2> sudo apt-mark hold fourtwosevenbb

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list fourtwosevenbb sudo dnf downgrade fourtwosevenbb-<VERSION_BEFORE_2.2> sudo dnf versionlock add fourtwosevenbb

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2006-0155?

fourtwosevenbb: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2006-0155 being exploited?

CVE-2006-0155 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2006-0155 affect?

CVE-2006-0155 affects fourtwosevenbb. Severity is medium (CVSS 4.3). Cross-site scripting (XSS) vulnerability in posts.php in 427BB 2.2 and 2.2.1 allows remote attackers to inject arbitrary Javascript via a new message with a url bbcode tag containing a javascript URI.

How urgent is CVE-2006-0155?

Priority 38/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

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References

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