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CVE-2018-1081

Moodle Unauthenticated users can trigger custom messages to admin via paypal enrol script

5.3 MediumFix available

A flaw was found in Moodle 3.4 to 3.4.1, 3.3 to 3.3.4, 3.2 to 3.2.7, 3.1 to 3.1.10 and earlier unsupported versions. Unauthenticated users can trigger custom messages to admin via paypal enrol script. Paypal IPN callback script should only send error emails to admin after request origin was verified, otherwise admin email can be spammed.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
Low
Availability
None

Exploit likelihood

1.41%Up 0.6 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 5.3

A flaw was found in Moodle 3.4 to 3.4.1, 3.3 to 3.3.4, 3.2 to 3.2.7, 3.1 to 3.1.10 and earlier unsupported versions. Unauthenticated users can trigger custom messages to admin via paypal enrol script. Paypal IPN callback script should only send error emails to admin after request origin was verified, otherwise admin email can be spammed.

Record
CVE-2018-1081
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CVSS 2.0
5.0 MediumAV:N/AC:L/Au:N/C:N/I:P/A:N
Weakness
CWE-79
Updated
2026-11-02
CVE List No score

A flaw was found in Moodle 3.4 to 3.4.1, 3.3 to 3.3.4, 3.2 to 3.2.7, 3.1 to 3.1.10 and earlier unsupported versions. Unauthenticated users can trigger custom messages to admin via paypal enrol script. Paypal IPN callback script should only send error emails to admin after request origin was verified, otherwise admin email can be spammed.

Record
CVE-2018-1081
Weakness
CWE-79
Updated
2026-11-02
EUVDEUVD-2022-5329 No score

A flaw was found in Moodle 3.4 to 3.4.1, 3.3 to 3.3.4, 3.2 to 3.2.7, 3.1 to 3.1.10 and earlier unsupported versions. Unauthenticated users can trigger custom messages to admin via paypal enrol script. Paypal IPN callback script should only send error emails to admin after request origin was verified, otherwise admin email can be spammed.

Record
EUVD-2022-5329
Updated
2026-11-03
GitHub AdvisoriesGHSA-v9xq-vh72-chr4 5.3

Moodle Unauthenticated users can trigger custom messages to admin via paypal enrol script

A flaw was found in Moodle 3.4 to 3.4.1, 3.3 to 3.3.4, 3.2 to 3.2.7, 3.1 to 3.1.10 and earlier unsupported versions. Unauthenticated users can trigger custom messages to admin via paypal enrol script. Paypal IPN callback script should only send error emails to admin after request origin was verified, otherwise admin email can be spammed.

Record
GHSA-v9xq-vh72-chr4
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Weakness
CWE-79
Updated
2026-11-02
OSV 5.3

A flaw was found in Moodle 3.4 to 3.4.1, 3.3 to 3.3.4, 3.2 to 3.2.7, 3.1 to 3.1.10 and earlier unsupported versions. Unauthenticated users can trigger custom messages to admin via paypal enrol script. Paypal IPN callback script should only send error emails to admin after request origin was verified, otherwise admin email can be spammed.

Record
CVE-2018-1081
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Updated
2026-11-02
OSVGHSA-v9xq-vh72-chr4 5.3

Moodle Unauthenticated users can trigger custom messages to admin via paypal enrol script

A flaw was found in Moodle 3.4 to 3.4.1, 3.3 to 3.3.4, 3.2 to 3.2.7, 3.1 to 3.1.10 and earlier unsupported versions. Unauthenticated users can trigger custom messages to admin via paypal enrol script. Paypal IPN callback script should only send error emails to admin after request origin was verified, otherwise admin email can be spammed.

Record
GHSA-v9xq-vh72-chr4
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Weakness
CWE-79
Updated
2026-11-02
OSVUBUNTU-CVE-2018-1081 5.3

A flaw was found in Moodle 3.4 to 3.4.1, 3.3 to 3.3.4, 3.2 to 3.2.7, 3.1 to 3.1.10 and earlier unsupported versions. Unauthenticated users can trigger custom messages to admin via paypal enrol script. Paypal IPN callback script should only send error emails to admin after request origin was verified, otherwise admin email can be spammed.

Record
UBUNTU-CVE-2018-1081
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
moodle/moodle
Packagist
 3.1 up to 3.1.11
3.1.11
moodle/moodle
Packagist
 3.2 up to 3.2.8
3.2.8
moodle/moodle
Packagist
 3.3 up to 3.3.5
3.3.5
moodle/moodle
Packagist
 3.4 up to 3.4.2
3.4.2
moodle/moodle
Packagist
 3.1 up to 3.1.11, plus listed versions
v3.1.0v3.1.0-betav3.1.0-rc1v3.1.0-rc2v3.1.1
Show 9 moreShow less
v3.1.10v3.1.2v3.1.3v3.1.4v3.1.5v3.1.6v3.1.7v3.1.8v3.1.9
3.1.11
moodle/moodle
Packagist
 3.2 up to 3.2.8, plus listed versions
v3.2.0v3.2.0-betav3.2.0-rc1v3.2.0-rc2v3.2.0-rc3
Show 9 moreShow less
v3.2.0-rc4v3.2.0-rc5v3.2.1v3.2.2v3.2.3v3.2.4v3.2.5v3.2.6v3.2.7
3.2.8
moodle/moodle
Packagist
 3.3 up to 3.3.5, plus listed versions
v3.3.0v3.3.0-betav3.3.0-rc1v3.3.0-rc2v3.3.0-rc3
Show 4 moreShow less
v3.3.1v3.3.2v3.3.3v3.3.4
3.3.5
moodle/moodle
Packagist
 3.4 up to 3.4.2, plus listed versions
v3.4.0v3.4.0-betav3.4.0-rc1v3.4.0-rc2v3.4.0-rc3v3.4.1
3.4.2
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-2018-1081 is a medium vulnerability (CVSS 5.3) in Moodle, published April 4, 2018. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.41%, the 72nd percentile. Fixed in moodle/moodle 3.1.11.

References

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