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CVE-2016-5013

Moodle Does Not Escape Characters In Email Headers

5.4 MediumFix available

In Moodle 2.x and 3.x, text injection can occur in email headers, potentially leading to outbound spam.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
Low
Integrity
Low
Availability
None

Exploit likelihood

1.06%Up 0.2 points since Feb 4, 2022
90%50%10%1%

What each source reports

NVD Score used 5.4

In Moodle 2.x and 3.x, text injection can occur in email headers, potentially leading to outbound spam.

Record
CVE-2016-5013
CVSS 3.0
5.4 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
CVSS 2.0
5.8 MediumAV:N/AC:M/Au:N/C:P/I:P/A:N
Weakness
CWE-74
Updated
2026-11-02
CVE List No score

In Moodle 2.x and 3.x, text injection can occur in email headers, potentially leading to outbound spam.

Record
CVE-2016-5013
Updated
2026-11-02
EUVDEUVD-2022-1991 No score

In Moodle 2.x and 3.x, text injection can occur in email headers, potentially leading to outbound spam.

Record
EUVD-2022-1991
Updated
2026-11-03
GitHub AdvisoriesGHSA-2hh3-jmv8-5fmx 5.4

Moodle Does Not Escape Characters In Email Headers

In Moodle 2.x and 3.x, text injection can occur in email headers, potentially leading to outbound spam.

Record
GHSA-2hh3-jmv8-5fmx
CVSS 3.0
5.4 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Weakness
CWE-74
Updated
2026-11-02
OSV 5.4

In Moodle 2.x and 3.x, text injection can occur in email headers, potentially leading to outbound spam.

Record
CVE-2016-5013
CVSS 3.0
5.4 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Updated
2026-11-02
OSVGHSA-2hh3-jmv8-5fmx 5.4

Moodle Does Not Escape Characters In Email Headers

In Moodle 2.x and 3.x, text injection can occur in email headers, potentially leading to outbound spam.

Record
GHSA-2hh3-jmv8-5fmx
CVSS 3.0
5.4 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Weakness
CWE-74
Updated
2026-11-02
OSVUBUNTU-CVE-2016-5013 5.4

In Moodle 2.x and 3.x, text injection can occur in email headers, potentially leading to outbound spam.

Record
UBUNTU-CVE-2016-5013
CVSS 3.0
5.4 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
moodle/moodle
Packagist
 3.0 to 3.0.4
3.0.5
moodle/moodle
Packagist
 2.9 to 2.9.6
2.9.7
moodle/moodle
Packagist
 2.8 to 2.8.12 None known
moodle/moodle
Packagist
 2.7 to 2.7.14
2.7.15
moodle/moodle
Packagist
 3.1 up to 3.1.1
3.1.1
moodle/moodle
Packagist
 3.1 up to 3.1.1, plus listed versions
v3.1.0v3.1.0-betav3.1.0-rc1v3.1.0-rc2
3.1.1
moodle/moodle
Packagist
 3.0 up to 3.0.5, plus listed versions
v3.0.0v3.0.0-betav3.0.0-rc1v3.0.0-rc2v3.0.0-rc3
Show 5 moreShow less
v3.0.0-rc4v3.0.1v3.0.2v3.0.3v3.0.4
3.0.5
moodle/moodle
Packagist
 2.9 up to 2.9.7, plus listed versions
v2.9.0v2.9.0-betav2.9.0-rc1v2.9.0-rc2v2.9.1
Show 5 moreShow less
v2.9.2v2.9.3v2.9.4v2.9.5v2.9.6
2.9.7
moodle/moodle
Packagist
 2.8 to 2.8.12, plus listed versions
v2.8.0v2.8.0-betav2.8.0-rc1v2.8.0-rc2v2.8.1
Show 11 moreShow less
v2.8.10v2.8.11v2.8.12v2.8.2v2.8.3v2.8.4v2.8.5v2.8.6v2.8.7v2.8.8v2.8.9
 None known
moodle/moodle
Packagist
 2.7 up to 2.7.15, plus listed versions
v2.7.0v2.7.0-betav2.7.0-rc1v2.7.0-rc2v2.7.1
Show 13 moreShow less
v2.7.10v2.7.11v2.7.12v2.7.13v2.7.14v2.7.2v2.7.3v2.7.4v2.7.5v2.7.6v2.7.7v2.7.8v2.7.9
2.7.15
moodle
Ubuntu:Pro:16.04:LTS
 All versions, plus listed versions
2.7.9+dfsg-12.7.10+dfsg-12.7.11+dfsg-12.7.11+dfsg-22.7.12+dfsg-13.0.3+dfsg-0ubuntu13.0.3+dfsg-0ubuntu1+esm1
 None known
moodle
Ubuntu:Pro:18.04:LTS
 All versions, plus listed versions
3.0.3+dfsg-0ubuntu13.0.3+dfsg-0ubuntu1+esm1
 None known

History

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

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

In short

CVE-2016-5013 is a medium vulnerability (CVSS 5.4) in Moodle, published January 20, 2017. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.06%, the 64th percentile. Fixed in moodle/moodle 3.0.5.

References

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