CVE-2005-4156: Unspecified vulnerability in Mambo 4.5 (1.0.0) through 4.5 (1.0.9), with magic_quotes_gpc disabled, allows rem

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HIGH 9.4DOWNGRADE

CVE-2005-4156 is a high-severity flaw (CVSS 9.4) affecting mambo open source 4.5. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Unspecified vulnerability in Mambo 4.5 (1.0.0) through 4.5 (1.0.9), with magic_quotes_gpc disabled, allows remote attackers to read arbitrary files and possibly cause a denial of service via a query string that ends with a NULL character.

Why this priority

Critical severity

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

Risk facts

CVSS score	9.4 (High)
EPSS exploit chance	1.8% (top 22%)
CISA exploited list	No
Published	2005-12-11
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: mambo

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

Am I affected?

Timeline

2005-12-11 02:03 UTCPublished CVE record published
2026-06-16 22:18 UTCUpdated Record last modified

mambo mambo open source 4.5 DOWNGRADE

Affected: 1.0.0 · 1.0.1 · 1.0.2 · 1.0.3 · 1.0.3_beta · 1.0.9

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.0

1. Check installed version

apt-cache policy mambo-open-source-4.5 || rpm -q mambo-open-source-4.5 || mambo-open-source-4.5 --version

2. No fixed release: DOWNGRADE to a release before 1.0.0 (Debian / Ubuntu)

apt-cache madison mambo-open-source-4.5 sudo apt install mambo-open-source-4.5=<VERSION_BEFORE_1.0.0> sudo apt-mark hold mambo-open-source-4.5

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

dnf --showduplicates list mambo-open-source-4.5 sudo dnf downgrade mambo-open-source-4.5-<VERSION_BEFORE_1.0.0> sudo dnf versionlock add mambo-open-source-4.5

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-2005-4156?

mambo open source 4.5: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2005-4156 being exploited?

CVE-2005-4156 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-2005-4156 affect?

CVE-2005-4156 affects mambo open source 4.5. Severity is high (CVSS 9.4). Unspecified vulnerability in Mambo 4.5 (1.0.0) through 4.5 (1.0.9), with magic_quotes_gpc disabled, allows remote attackers to read arbitrary files and possibly cause a denial of service via a query string that ends with a NULL character.

How urgent is CVE-2005-4156?

Priority 52/100. Critical severity

Related CVEs

CVE-2004-1826 HIGH 7.5 DOWNGRADE SQL injection vulnerability in index.php in Mambo Open Source 4.5 stable 1.0.3 and earlier allows remote attac

References

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