CVE-2013-3603: Cross-site scripting (XSS) vulnerability in Coursemill Learning Management System (LMS) 6.6 allows remote atta

Routine

MEDIUM 4.3DOWNGRADE

CVE-2013-3603 is a medium-severity flaw (CVSS 4.3) affecting coursemill learning management system. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-site scripting (XSS) vulnerability in Coursemill Learning Management System (LMS) 6.6 allows remote attackers to inject arbitrary web script or HTML via vectors related to error messages.

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	1.0% (top 37%)
CISA exploited list	No
Weakness	CWE-79
Published	2013-09-06
Last modified	2026-06-16

Publisher (CNA): CERT/CC · Vendor: trivantis

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

Am I affected?

Timeline

2013-09-06 11:15 UTCPublished CVE record published
2026-06-16 23:55 UTCUpdated Record last modified

trivantis coursemill learning management system DOWNGRADE

Affected: 6.6

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.6

1. Check installed version

apt-cache policy coursemill-learning-management-system || rpm -q coursemill-learning-management-system || coursemill-learning-management-system --version

2. No fixed release: DOWNGRADE to a release before 6.6 (Debian / Ubuntu)

apt-cache madison coursemill-learning-management-system sudo apt install coursemill-learning-management-system=<VERSION_BEFORE_6.6> sudo apt-mark hold coursemill-learning-management-system

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

dnf --showduplicates list coursemill-learning-management-system sudo dnf downgrade coursemill-learning-management-system-<VERSION_BEFORE_6.6> sudo dnf versionlock add coursemill-learning-management-system

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-2013-3603?

coursemill learning management system: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2013-3603 being exploited?

CVE-2013-3603 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-2013-3603 affect?

CVE-2013-3603 affects coursemill learning management system. Severity is medium (CVSS 4.3). Cross-site scripting (XSS) vulnerability in Coursemill Learning Management System (LMS) 6.6 allows remote attackers to inject arbitrary web script or HTML via vectors related to error messages.

How urgent is CVE-2013-3603?

Priority 31/100. No elevated risk signals yet.

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References

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