CVE-2006-4580: register.php in The Address Book 1.04e allows remote attackers to bypass the "Allow User Self-Registration" se

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HIGH 7.5DOWNGRADE

CVE-2006-4580 is a high-severity flaw (CVSS 7.5) affecting the address book. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

register.php in The Address Book 1.04e allows remote attackers to bypass the "Allow User Self-Registration" setting and create arbitrary users by setting the mode parameter to "confirm".

Why this priority

High severity

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	1.5% (top 26%)
CISA exploited list	No
Published	2006-12-31
Last modified	2026-06-16

Publisher (CNA): Flexera Software LLC · Vendor: the address book

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

Am I affected?

Timeline

2006-12-31 05:00 UTCPublished CVE record published
2026-06-16 22:29 UTCUpdated Record last modified

the address book the address book DOWNGRADE

Affected: 1.04e

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.04e

1. Check installed version

apt-cache policy the-address-book || rpm -q the-address-book || the-address-book --version

2. No fixed release: DOWNGRADE to a release before 1.04e (Debian / Ubuntu)

apt-cache madison the-address-book sudo apt install the-address-book=<VERSION_BEFORE_1.04e> sudo apt-mark hold the-address-book

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

dnf --showduplicates list the-address-book sudo dnf downgrade the-address-book-<VERSION_BEFORE_1.04e> sudo dnf versionlock add the-address-book

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-2006-4580?

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

Is CVE-2006-4580 being exploited?

CVE-2006-4580 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-2006-4580 affect?

CVE-2006-4580 affects the address book. Severity is high (CVSS 7.5). register.php in The Address Book 1.04e allows remote attackers to bypass the "Allow User Self-Registration" setting and create arbitrary users by setting the mode parameter to "confirm".

How urgent is CVE-2006-4580?

Priority 45/100. High severity

Software pages

PHP vulnerabilities

Related CVEs

CVE-2006-4582 MEDIUM 5.0 DOWNGRADE Cross-site request forgery (CSRF) vulnerability in The Address Book 1.04e allows remote attackers to perform u
CVE-2006-4581 MEDIUM 5.0 DOWNGRADE Unrestricted file upload vulnerability in The Address Book 1.04e validates the Content-Type header but not the
CVE-2006-4579 MEDIUM 5.0 DOWNGRADE Directory traversal vulnerability in users.php in The Address Book 1.04e allows remote attackers to include ar
CVE-2006-4578 HIGH 7.5 DOWNGRADE export.php in The Address Book 1.04e writes username and password hash information into a publicly accessible
CVE-2006-4577 MEDIUM 6.8 DOWNGRADE Multiple cross-site scripting (XSS) vulnerabilities in The Address Book 1.04e allow remote attackers to inject

References

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