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CVE-2013-4522

15
FAUCET Score

CVE-2013-4522 describes an information disclosure vulnerability in Moodle versions through 2.2.11, 2.3.x before 2.3.10, 2.4.x before 2.4.7, and 2.5.x before 2.5.3. The vulnerability arises because the 'lib/filelib.php' component fails to send "Cache-Control: private" HTTP headers. This oversight allows remote attackers to obtain sensitive information by requesting files that have been previously cached by a proxy server. The vulnerability has a CVSS score of 5.0 (Medium), indicating a network-based attack with low complexity, requiring no authentication, and resulting in partial confidentiality impact. There is no integrity or availability impact. Currently, there is no evidence of active exploitation, nor is exploit code publicly available on platforms like Metasploit or ExploitDB. The vulnerability has received minimal community discussion and media coverage, suggesting a low level of public attention.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2.2.11CPE matchmatch criteria
cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*
1.1.1CPE matchmatch criteria
cpe:2.3:a:moodle:moodle:1.1.1:*:*:*:*:*:*:*
1.2.0CPE matchmatch criteria
cpe:2.3:a:moodle:moodle:1.2.0:*:*:*:*:*:*:*
1.2.1CPE matchmatch criteria
cpe:2.3:a:moodle:moodle:1.2.1:*:*:*:*:*:*:*
1.3.0CPE matchmatch criteria
cpe:2.3:a:moodle:moodle:1.3.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

AV:N/AC:L/Au:N/C:P/I:N/A:N

Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
1.54%
Probability of exploitation in next 30 days
EPSS Percentile
72.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0154 is in the 55th percentile among its peer group of 23,725 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

composerpatch availablevia ghsa
Product: moodle/moodleFixed in: 2.3.10
composerpatch availablevia ghsa
Product: moodle/moodleFixed in: 2.4.7
composerpatch availablevia ghsa
Product: moodle/moodleFixed in: 2.5.3

Vendor Advisories (1)

composerGHSA-vm9c-39jx-q45wmedium

Moodle vulnerable to Exposure of Sensitive Information to an Unauthorized Actor

May 13, 2022

References

git.moodle.org / gw
ExploitPatch
openwall.com / lists/oss-security/2013/11/25/1
moodle.org / mod/forum/discuss.php
Vendor Advisory