CVE-2008-4921: board/admin/reguser.php in Chipmunk CMS 1.3 allows remote attackers to bypass authentication and gain administ

This month

HIGH 7.5DOWNGRADE

CVE-2008-4921 is a high-severity flaw (CVSS 7.5) affecting chipmunk cms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

board/admin/reguser.php in Chipmunk CMS 1.3 allows remote attackers to bypass authentication and gain administrator privileges via a direct request. NOTE: some of these details are obtained from third party information.

Why this priority

High severity

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	2.6% (top 15%)
CISA exploited list	No
Weakness	CWE-264
Published	2008-11-04
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: chipmunk scripts

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

Am I affected?

Timeline

2008-11-04 21:00 UTCPublished CVE record published
2026-06-16 22:58 UTCUpdated Record last modified

chipmunk scripts chipmunk cms DOWNGRADE

Affected: 1.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.3

1. Check installed version

apt-cache policy chipmunk-cms || rpm -q chipmunk-cms || chipmunk-cms --version

2. No fixed release: DOWNGRADE to a release before 1.3 (Debian / Ubuntu)

apt-cache madison chipmunk-cms sudo apt install chipmunk-cms=<VERSION_BEFORE_1.3> sudo apt-mark hold chipmunk-cms

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

dnf --showduplicates list chipmunk-cms sudo dnf downgrade chipmunk-cms-<VERSION_BEFORE_1.3> sudo dnf versionlock add chipmunk-cms

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-2008-4921?

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

Is CVE-2008-4921 being exploited?

CVE-2008-4921 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-2008-4921 affect?

CVE-2008-4921 affects chipmunk cms. Severity is high (CVSS 7.5). board/admin/reguser.php in Chipmunk CMS 1.3 allows remote attackers to bypass authentication and gain administrator privileges via a direct request. NOTE: some of these details are obtained from third party information.

How urgent is CVE-2008-4921?

Priority 48/100. High severity

Software pages

PHP vulnerabilities

References

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