CVE-2003-1252: register.php in S8Forum 3.0 allows remote attackers to execute arbitrary PHP commands by creating a user whose

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HIGH 7.5DOWNGRADE

CVE-2003-1252 is a high-severity flaw (CVSS 7.5) affecting s8forum. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

register.php in S8Forum 3.0 allows remote attackers to execute arbitrary PHP commands by creating a user whose name ends in a .php extension and entering the desired commands into the E-mail field, which creates a web-accessible .php file that can be called by the attacker, as demonstrated using a "system($cmd)" E-mail address with a "any_name.php" username.

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	3.1% (top 12%)
CISA exploited list	No
Published	2003-12-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: kelli shaver

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

Am I affected?

Timeline

2003-12-31 05:00 UTCPublished CVE record published
2026-06-16 22:03 UTCUpdated Record last modified

kelli shaver s8forum DOWNGRADE

Affected: 3.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.0

1. Check installed version

apt-cache policy s8forum || rpm -q s8forum || s8forum --version

2. No fixed release: DOWNGRADE to a release before 3.0 (Debian / Ubuntu)

apt-cache madison s8forum sudo apt install s8forum=<VERSION_BEFORE_3.0> sudo apt-mark hold s8forum

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

dnf --showduplicates list s8forum sudo dnf downgrade s8forum-<VERSION_BEFORE_3.0> sudo dnf versionlock add s8forum

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: S8Forum 3.0 - Remote Command Execution

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-2003-1252?

s8forum: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2003-1252 being exploited?

CVE-2003-1252 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-2003-1252 affect?

CVE-2003-1252 affects s8forum. Severity is high (CVSS 7.5). register.php in S8Forum 3.0 allows remote attackers to execute arbitrary PHP commands by creating a user whose name ends in a .php extension and entering the desired commands into the E-mail field, which creates a web-accessible .php file t

How urgent is CVE-2003-1252?

Priority 53/100. High severity; Public exploit reference

Software pages

PHP vulnerabilities

References

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