CVE-2011-3203: A Code Execution vulnerability exists the attachment parameter to index.php in Jcow CMS 4.x to 4.2 and 5.2 to

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CRITICAL 9.8REMOTEUPGRADE

CVE-2011-3203 is a critical-severity flaw (CVSS 9.8) affecting jcow cms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A Code Execution vulnerability exists the attachment parameter to index.php in Jcow CMS 4.x to 4.2 and 5.2 to 5.2.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.4% (top 16%)
CISA exploited list	No
Weakness	CWE-20
Published	2020-01-14
Last modified	2026-06-16

Publisher (CNA): Red Hat, Inc. · Vendor: jcow

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

Am I affected?

Timeline

2020-01-14 20:15 UTCPublished CVE record published
2026-06-16 23:32 UTCUpdated Record last modified

jcow jcow cms UPGRADE

Affected: >= 4.0 and <= 4.2 · >= 5.0 and <= 5.2

Fixed in: newer than 5.2

Safe to downgrade to: a release before 4.0

1. Check installed version

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

2. UPGRADE to newer than 5.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade jcow-cms

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade jcow-cms

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 4.0 (Debian / Ubuntu)

apt-cache madison jcow-cms sudo apt install jcow-cms=<VERSION_BEFORE_4.0> sudo apt-mark hold jcow-cms

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list jcow-cms sudo dnf downgrade jcow-cms-<VERSION_BEFORE_4.0> sudo dnf versionlock add jcow-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-2011-3203?

jcow cms: upgrade to newer than 5.2. Exact commands for each OS are on this page.

Is CVE-2011-3203 being exploited?

CVE-2011-3203 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-2011-3203 affect?

CVE-2011-3203 affects jcow cms. Severity is critical (CVSS 9.8). A Code Execution vulnerability exists the attachment parameter to index.php in Jcow CMS 4.x to 4.2 and 5.2 to 5.2.

How urgent is CVE-2011-3203?

Priority 65/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

CVE-2011-3202 MEDIUM 6.1 UPGRADE A Cross-Site Scripting (XSS) vulnerability exists in the g parameter to index.php in Jcow CMS 4.2 and earlier.

References

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