CVE-2004-1600: index.php in CoolPHP 1.0-stable allows remote attackers to gain sensitive information via an invalid op parame

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MEDIUM 5.0DOWNGRADE

CVE-2004-1600 is a medium-severity flaw (CVSS 5.0) affecting coolphp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

index.php in CoolPHP 1.0-stable allows remote attackers to gain sensitive information via an invalid op parameter, which reveals the path in an error message.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	1.5% (top 25%)
CISA exploited list	No
Published	2004-10-16
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: coolphp

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

Am I affected?

Timeline

2004-10-16 04:00 UTCPublished CVE record published
2026-06-16 22:08 UTCUpdated Record last modified

coolphp coolphp DOWNGRADE

Affected: 1.0_stable

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0_stable

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.0_stable (Debian / Ubuntu)

apt-cache madison coolphp sudo apt install coolphp=<VERSION_BEFORE_1.0_stable> sudo apt-mark hold coolphp

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

dnf --showduplicates list coolphp sudo dnf downgrade coolphp-<VERSION_BEFORE_1.0_stable> sudo dnf versionlock add coolphp

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-2004-1600?

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

Is CVE-2004-1600 being exploited?

CVE-2004-1600 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-2004-1600 affect?

CVE-2004-1600 affects coolphp. Severity is medium (CVSS 5.0). index.php in CoolPHP 1.0-stable allows remote attackers to gain sensitive information via an invalid op parameter, which reveals the path in an error message.

How urgent is CVE-2004-1600?

Priority 41/100. Public exploit reference

Software pages

PHP vulnerabilities

References

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