CVE-2006-4581: Unrestricted file upload vulnerability in The Address Book 1.04e validates the Content-Type header but not the

Routine

MEDIUM 5.0DOWNGRADE

CVE-2006-4581 is a medium-severity flaw (CVSS 5.0) affecting the address book. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Unrestricted file upload vulnerability in The Address Book 1.04e validates the Content-Type header but not the file extension, which allows remote attackers to upload arbitrary PHP scripts.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	1.3% (top 30%)
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-2006-4581?

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

Is CVE-2006-4581 being exploited?

CVE-2006-4581 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-2006-4581 affect?

CVE-2006-4581 affects the address book. Severity is medium (CVSS 5.0). Unrestricted file upload vulnerability in The Address Book 1.04e validates the Content-Type header but not the file extension, which allows remote attackers to upload arbitrary PHP scripts.

How urgent is CVE-2006-4581?

Priority 35/100. No elevated risk signals yet.

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-2006-4580 HIGH 7.5 DOWNGRADE register.php in The Address Book 1.04e allows remote attackers to bypass the "Allow User Self-Registration" se
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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