Moodle Open Redirect Via Error Messages

published 2012-07-16 14 y ago modified 2026-06-16 4 mo ago also GHSA-hxmp-8f47-x9fc , EUVD-2022-4243

cvss: 5.8; version 2.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.5%; EPSS 1.5% chance of exploitation in 30 days, percentile 75%
public exploits: 0; none known

The error-message functionality in Moodle 1.9.x before 1.9.13, 2.0.x before 2.0.4, and 2.1.x before 2.1.1 does not ensure that a continuation link refers to an http or https URL for the local Moodle instance, which might allow attackers to trick users into visiting arbitrary web sites via unspecified vectors.

Patch / fix

fixed in 1 links 4

packagist moodle/moodle 1.9.13, 2.0.4, 2.1.1

github.com/moodle/moodle@18c2fcf commit
github.com/moodle/moodle@417fdfa commit
github.com/moodle/moodle@8f9f666 commit
git.moodle.org/gw?p=moodle.git;a=commit;h=8f9f666c902cb30ef6f519353f38c45… commit

Exploit prediction

1.54% chance of exploitation in the next 30 days, higher than 75% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
NVD	2.0	5.8	AV:N/AC:M/Au:N/C:N/I:P/A:P

Affected packages

ecosystem	package	affected	fixed in
packagist	moodle/moodle	<1.9.13 >=2.0, <2.0.4 >=2.1, <2.1.1	1.9.13 2.0.4 2.1.1

Classification

Weakness

CWE-20 Improper Input Validation
CWE-601 URL Redirection to Untrusted Site

References

Sources

CVE List CVE-2011-4294
GitHub Advisory GHSA-hxmp-8f47-x9fc
NVD CVE-2011-4294

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary