How severe is CVE-2016-5013?

CVE-2016-5013 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2016-5013 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-5013?

CVE-2016-5013 primarily affects Moodle. In total, 27 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-5013?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2016-5013 published?

CVE-2016-5013 was published on 2017-01-20 and last updated on 2026-06-17.

CVE-2016-5013

CVE-2016-5013 is a medium-severity vulnerability in Moodle with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-74.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v2: 5.8
EPSS exploit prediction: 1% (54th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-74
Affected product: Moodle
Published: 2017-01-20
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2016-5013?: In Moodle 2.x and 3.x, text injection can occur in email headers, potentially leading to outbound spam.
How severe is CVE-2016-5013?: CVE-2016-5013 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2016-5013 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-5013?: CVE-2016-5013 primarily affects Moodle. In total, 27 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2016-5013?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2016-5013 published?: CVE-2016-5013 was published on 2017-01-20 and last updated on 2026-06-17.

References

Affected products (27)

cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.8.0:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.8.1:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.8.2:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.8.3:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.8.4:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.8.5:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.8.6:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.8.7:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.8.8:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.8.9:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.8.10:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.8.11:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.8.12:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.9.0:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.9.1:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.9.2:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.9.3:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.9.4:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.9.5:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.9.6:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:3.0.0:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:3.0.1:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:3.0.2:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:3.0.3:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:3.0.4:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:3.1.0:*:*:*:*:*:*:*

More vulnerabilities in Moodle

CVE-2006-4935 — Critical (CVSS 10.0): The Database module in Moodle before 1.6.2 does not properly handle uploaded files, which has unspecified impact and…
CVE-2006-4936 — Critical (CVSS 10.0): Moodle before 1.6.2 does not properly validate the module instance id when creating a course module object, which has…
CVE-2005-2247 — Critical (CVSS 10.0): Multiple unknown vulnerabilities in Moodle before 1.5.1 have unknown impact and attack vectors.
CVE-2004-2233 — Critical (CVSS 10.0): Unknown "front page vulnerability with Moodle servers" for Moodle before 1.3.2 has unknown impact and attack vectors.
CVE-2004-2236 — Critical (CVSS 10.0): Unknown vulnerability in Moodle before 1.3.3 has unknown impact and attack vectors, related to language setting.
CVE-2004-2237 — Critical (CVSS 10.0): Unknown vulnerability in Moodle before 1.3.4 has unknown impact and attack vectors, related to "strings in Moodle…

All CVEs affecting Moodle →

Other CWE-74 (Improper Neutralization of Special Elements (Injection)) vulnerabilities

CVE-2026-25586 — Critical (CVSS 10.0): SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, a sandbox escape is possible by shadowing hasOwnProperty…
CVE-2026-25520 — Critical (CVSS 10.0): SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, The return values of functions aren't wrapped.…
CVE-2025-20265 — Critical (CVSS 10.0): A vulnerability in the RADIUS subsystem implementation of Cisco Secure Firewall Management Center (FMC) Software could…
CVE-2025-20337 — Critical (CVSS 10.0): A vulnerability in a specific API of Cisco ISE and Cisco ISE-PIC could allow an unauthenticated, remote attacker to…
CVE-2025-20281 — Critical (CVSS 10.0): A vulnerability in a specific API of Cisco ISE and Cisco ISE-PIC could allow an unauthenticated, remote attacker to…
CVE-2024-42472 — Critical (CVSS 10.0): Flatpak is a Linux application sandboxing and distribution framework. Prior to versions 1.14.0 and 1.15.10, a malicious…

Browse all CWE-74 (Improper Neutralization of Special Elements (Injection)) vulnerabilities →