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CVE-2013-4940

YUI Cross-site Scripting (XSS) vulnerability

4.3 MediumFix available

CVE-2013-4940 is a medium vulnerability (CVSS 4.3) in Moodle, published July 26, 2013. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.49%, the 74th percentile. Fixed in yui 3.10.11.

What does this mean?
Severity
4.3 MediumCVSS 2.0, NVD
Exploit chance
1.49%EPSS, 74th percentile
Exploitation
None knownNot on CISA’s or ENISA’s lists
Fixed in
3.10.11yui +10 more

Description

Cross-site scripting (XSS) vulnerability in io.swf in the IO Utility component in Yahoo! YUI 3.10.2, as used in Moodle through 2.1.10, 2.2.x before 2.2.11, 2.3.x before 2.3.8, 2.4.x before 2.4.5, 2.5.x before 2.5.1, and other products, allows remote attackers to inject arbitrary web script or HTML via a crafted string in a URL. NOTE: this vulnerability exists because of a CVE-2013-4939 regression.

Exploit likelihood

1.49%Up 0.4 points since Feb 4, 2022
90%50%10%1%

Affected products

Affected packages

Affected packages
PackageAffectedFixed
yui
npm
3.0.0 to 3.10.0
3.10.11
yui
npm
3.10.12 to 3.10.12
3.10.13
moodle/moodle
Packagist
before 2.2.11
2.2.11
moodle/moodle
Packagist
2.3.0 up to 2.3.8
2.3.8
moodle/moodle
Packagist
2.4.0-rc1 up to 2.4.5
2.4.5
moodle/moodle
Packagist
2.5.0-beta up to 2.5.1
2.5.1
yui
npm
3.0.0 up to 3.10.11
3.10.11
yui
npm
3.10.12 up to 3.10.13
3.10.13
moodle/moodle
Packagist
2.3.0 up to 2.3.8, plus listed versions
v2.3.4v2.3.5v2.3.6v2.3.7
2.3.8
moodle/moodle
Packagist
2.4.0-rc1 up to 2.4.5, plus listed versions
v2.4.0v2.4.0-rc1v2.4.1v2.4.2v2.4.3v2.4.4
2.4.5
moodle/moodle
Packagist
2.5.0-beta up to 2.5.1, plus listed versions
v2.5.0v2.5.0-betav2.5.0-rc1
2.5.1

What each source reports

NVD Score used4.3

Cross-site scripting (XSS) vulnerability in io.swf in the IO Utility component in Yahoo! YUI 3.10.2, as used in Moodle through 2.1.10, 2.2.x before 2.2.11, 2.3.x before 2.3.8, 2.4.x before 2.4.5, 2.5.x before 2.5.1, and other products, allows remote attackers to inject arbitrary web script or HTML via a crafted string in a URL. NOTE: this vulnerability exists because of a CVE-2013-4939 regression.

Record
CVE-2013-4940
CVSS 2.0
4.3 MediumAV:N/AC:M/Au:N/C:N/I:P/A:N
Weakness
CWE-79
Updated
2026-11-02
CVE ListNo score

Cross-site scripting (XSS) vulnerability in io.swf in the IO Utility component in Yahoo! YUI 3.10.2, as used in Moodle through 2.1.10, 2.2.x before 2.2.11, 2.3.x before 2.3.8, 2.4.x before 2.4.5, 2.5.x before 2.5.1, and other products, allows remote attackers to inject arbitrary web script or HTML via a crafted string in a URL. NOTE: this vulnerability exists because of a CVE-2013-4939 regression.

Record
CVE-2013-4940
Updated
2026-11-02
EUVDEUVD-2013-4784No score

Cross-site scripting (XSS) vulnerability in io.swf in the IO Utility component in Yahoo! YUI 3.10.2, as used in Moodle through 2.1.10, 2.2.x before 2.2.11, 2.3.x before 2.3.8, 2.4.x before 2.4.5, 2.5.x before 2.5.1, and other products, allows remote attackers to inject arbitrary web script or HTML via a crafted string in a URL. NOTE: this vulnerability exists because of a CVE-2013-4939 regression.

Record
EUVD-2013-4784
Updated
2026-11-03
GitHub AdvisoriesGHSA-x5hj-47vv-53p85.3

YUI Cross-site Scripting (XSS) vulnerability

Cross-site scripting (XSS) vulnerability in io.swf in the IO Utility component in Yahoo! YUI 3.10.2, as used in Moodle through 2.1.10, 2.2.x before 2.2.11, 2.3.x before 2.3.8, 2.4.x before 2.4.5, 2.5.x before 2.5.1, and other products, allows remote attackers to inject arbitrary web script or HTML via a crafted string in a URL. NOTE: this vulnerability exists because of a CVE-2013-4939 regression.

Record
GHSA-x5hj-47vv-53p8
CVSS 4.0
5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Weakness
CWE-79
Updated
2026-11-02
OSVGHSA-x5hj-47vv-53p85.3

YUI Cross-site Scripting (XSS) vulnerability

Cross-site scripting (XSS) vulnerability in io.swf in the IO Utility component in Yahoo! YUI 3.10.2, as used in Moodle through 2.1.10, 2.2.x before 2.2.11, 2.3.x before 2.3.8, 2.4.x before 2.4.5, 2.5.x before 2.5.1, and other products, allows remote attackers to inject arbitrary web script or HTML via a crafted string in a URL. NOTE: this vulnerability exists because of a CVE-2013-4939 regression.

Record
GHSA-x5hj-47vv-53p8
CVSS 4.0
5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Weakness
CWE-79
Updated
2026-11-02

History

History
RecordedChangedSources
facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

References

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