CVE-2016-10956: The mail-masta plugin 1.0 for WordPress has local file inclusion in count_of_send.php and csvexport.php.

This week

HIGH 7.5REMOTEDOWNGRADE

CVE-2016-10956 is a high-severity flaw (CVSS 7.5) affecting mail-masta. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The mail-masta plugin 1.0 for WordPress has local file inclusion in count_of_send.php and csvexport.php.

Why this priority

High severity
EPSS top 4%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	10.6% (top 4%)
CISA exploited list	No
Weakness	CWE-20
Published	2019-09-16
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: mail-masta project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-09-16 12:15 UTCPublished CVE record published
2026-06-17 00:40 UTCUpdated Record last modified

mail-masta project mail-masta DOWNGRADE

Affected: 1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

apt-cache policy mail-masta || rpm -q mail-masta || mail-masta --version

2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison mail-masta sudo apt install mail-masta=<VERSION_BEFORE_1.0> sudo apt-mark hold mail-masta

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list mail-masta sudo dnf downgrade mail-masta-<VERSION_BEFORE_1.0> sudo dnf versionlock add mail-masta

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Nuclei scan template: WordPress Mail Masta 1.0 - Local File Inclusion

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2016-10956?

mail-masta: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2016-10956 being exploited?

CVE-2016-10956 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2016-10956 affect?

CVE-2016-10956 affects mail-masta. Severity is high (CVSS 7.5). The mail-masta plugin 1.0 for WordPress has local file inclusion in count_of_send.php and csvexport.php.

How urgent is CVE-2016-10956?

Priority 60/100. High severity; EPSS top 4%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

WordPress vulnerabilities · PHP vulnerabilities

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CVE-2017-6578 HIGH 7.2 DOWNGRADE A SQL injection issue is exploitable, with WordPress admin access, in the Mail Masta (aka mail-masta) plugin 1
CVE-2017-6577 HIGH 7.2 DOWNGRADE A SQL injection issue is exploitable, with WordPress admin access, in the Mail Masta (aka mail-masta) plugin 1
CVE-2017-6576 HIGH 7.2 DOWNGRADE A SQL injection issue is exploitable, with WordPress admin access, in the Mail Masta (aka mail-masta) plugin 1
CVE-2017-6575 HIGH 7.2 DOWNGRADE A SQL injection issue is exploitable, with WordPress admin access, in the Mail Masta (aka mail-masta) plugin 1
CVE-2017-6574 HIGH 7.2 DOWNGRADE A SQL injection issue is exploitable, with WordPress admin access, in the Mail Masta (aka mail-masta) plugin 1

References

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