CVE-2006-0153: 427BB 2.2 and 2.2.1 verifies authentication credentials based on the username, authenticated, and usertype coo

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HIGH 7.5DOWNGRADE

CVE-2006-0153 is a high-severity flaw (CVSS 7.5) affecting fourtwosevenbb. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

427BB 2.2 and 2.2.1 verifies authentication credentials based on the username, authenticated, and usertype cookies, which allows remote attackers to bypass authentication by using a valid username and usertype and setting the authenticated cookie.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	3.4% (top 11%)
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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: 427BB 2.2 - Authentication Bypass

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-2006-0153?

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

Is CVE-2006-0153 being exploited?

CVE-2006-0153 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-2006-0153 affect?

CVE-2006-0153 affects fourtwosevenbb. Severity is high (CVSS 7.5). 427BB 2.2 and 2.2.1 verifies authentication credentials based on the username, authenticated, and usertype cookies, which allows remote attackers to bypass authentication by using a valid username and usertype and setting the authenticated

How urgent is CVE-2006-0153?

Priority 53/100. High severity; Public exploit reference

Related CVEs

CVE-2006-0155 MEDIUM 4.3 DOWNGRADE Cross-site scripting (XSS) vulnerability in posts.php in 427BB 2.2 and 2.2.1 allows remote attackers to inject
CVE-2006-0154 HIGH 7.5 DOWNGRADE SQL injection vulnerability in showthread.php in 427BB 2.2 and 2.2.1 allows remote attackers to execute arbitr
CVE-2005-0629 MEDIUM 4.3 DOWNGRADE Multiple cross-site scripting (XSS) vulnerabilities in profile.php in 427BB 2.2 allow remote attackers to inje

References

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