CVE-2010-4358: Multiple cross-site scripting (XSS) vulnerabilities in gb.cgi in MRCGIGUY (MCG) Guestbook 1.0 allow remote att

Routine

MEDIUM 4.3DOWNGRADE

CVE-2010-4358 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.

Multiple cross-site scripting (XSS) vulnerabilities in gb.cgi in MRCGIGUY (MCG) Guestbook 1.0 allow remote attackers to inject arbitrary web script or HTML via the (1) name, (2) email, (3) website, and (4) message parameters.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	4.3 (Medium)
EPSS exploit chance	1.1% (top 34%)
CISA exploited list	No
Weakness	CWE-79
Published	2010-12-01
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: mrcgiguy

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

Am I affected?

Timeline

2010-12-01 16:06 UTCPublished CVE record published
2026-06-16 23:24 UTCUpdated Record last modified

mrcgiguy guestbook DOWNGRADE

Affected: 1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

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

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

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

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

dnf --showduplicates list guestbook sudo dnf downgrade guestbook-<VERSION_BEFORE_1.0> 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-2010-4358?

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

Is CVE-2010-4358 being exploited?

CVE-2010-4358 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-2010-4358 affect?

CVE-2010-4358 affects guestbook. Severity is medium (CVSS 4.3). Multiple cross-site scripting (XSS) vulnerabilities in gb.cgi in MRCGIGUY (MCG) Guestbook 1.0 allow remote attackers to inject arbitrary web script or HTML via the (1) name, (2) email, (3) website, and (4) message parameters.

How urgent is CVE-2010-4358?

Priority 37/100. Public exploit reference

Related CVEs

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CVE-2014-125053 MEDIUM 5.5 UPGRADE A vulnerability was found in Piwigo-Guest-Book up to 1.3.0
CVE-2010-4987 HIGH 7.5 MITIGATE SQL injection vulnerability in default.asp in KMSoft Guestbook (aka GBook) allows remote attackers to execute
CVE-2010-0978 MEDIUM 5.0 DOWNGRADE KMSoft Guestbook (aka GBook) 1.0 stores sensitive information under the web root with insufficient access cont
CVE-2009-2648 MEDIUM 5.0 MITIGATE FlashDen Guestbook allows remote attackers to obtain configuration information via a direct request to amfphp/

References

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