CVE-2003-1546: Cross-site scripting (XSS) vulnerability in gbook.php in Filebased guestbook 1.1.3 allows remote attackers to

Routine

MEDIUM 4.3DOWNGRADE

CVE-2003-1546 is a medium-severity flaw (CVSS 4.3) affecting guestbook. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-site scripting (XSS) vulnerability in gbook.php in Filebased guestbook 1.1.3 allows remote attackers to inject arbitrary web script or HTML via the comment section.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	4.3 (Medium)
EPSS exploit chance	1.1% (top 35%)
CISA exploited list	No
Weakness	CWE-79
Published	2003-12-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: filebased

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 22:04 UTCUpdated Record last modified

filebased guestbook DOWNGRADE

Affected: 1.1.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.1.3

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.1.3 (Debian / Ubuntu)

apt-cache madison guestbook sudo apt install guestbook=<VERSION_BEFORE_1.1.3> sudo apt-mark hold guestbook

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

dnf --showduplicates list guestbook sudo dnf downgrade guestbook-<VERSION_BEFORE_1.1.3> sudo dnf versionlock add guestbook

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-2003-1546?

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

Is CVE-2003-1546 being exploited?

CVE-2003-1546 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-2003-1546 affect?

CVE-2003-1546 affects guestbook. Severity is medium (CVSS 4.3). Cross-site scripting (XSS) vulnerability in gbook.php in Filebased guestbook 1.1.3 allows remote attackers to inject arbitrary web script or HTML via the comment section.

How urgent is CVE-2003-1546?

Priority 31/100. No elevated risk signals yet.

Software pages

PHP vulnerabilities

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References

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