CVE-2011-4586

CRLF injection vulnerability in calendar/set.php in the Calendar subsystem in Moodle 1.9.x before...

5.0 MediumFix available

CVE-2011-4586 is a medium vulnerability (CVSS 5.0) in Moodle, published February 29, 2012. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.10%, the 81st percentile. Fixed in moodle 1.9.9.dfsg2-2.1+squeeze3.

CRLF injection vulnerability in calendar/set.php in the Calendar subsystem in Moodle 1.9.x before 1.9.15, 2.0.x before 2.0.6, and 2.1.x before 2.1.3 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via unspecified vectors.

Exploit likelihood

2.10%Up 0.9 points since Feb 4, 2022

What each source reports

NVD Score used 5.0

Record: CVE-2011-4586
CVSS 2.0: 5.0 MediumAV:N/AC:L/Au:N/C:N/I:P/A:N
Updated: 2026-11-02

CVE List No score

Record: CVE-2011-4586
Updated: 2026-11-02

EUVDEUVD-2011-4511 No score

Record: EUVD-2011-4511
Updated: 2026-11-03

GitHub AdvisoriesGHSA-5hc2-8542-698w No score

CRLF injection vulnerability in calendar/set.php in the Calendar subsystem in Moodle 1.9.x before...

Record: GHSA-5hc2-8542-698w
Updated: 2026-11-02

Affected products

moodle

Affected packages

Affected packages
Package	Affected	Fixed
`moodle` Debian:6.0	before 1.9.9.dfsg2-2.1+squeeze3, plus listed versions 1.9.9.dfsg2-2.11.9.9.dfsg2-2.1+squeeze11.9.9.dfsg2-2.1+squeeze2	1.9.9.dfsg2-2.1+squeeze3

History

History
When	Changed	Sources
2026-11-03	aliases	EUVD
2026-11-02	created	CVE List, GitHub Advisories, NVD, OSV