CVE-2016-1000156: Mailcwp remote file upload vulnerability incomplete fix v1.100

Q: How do I fix CVE-2016-1000156?

mailcwp: upgrade to newer than 1.100. Exact commands for each OS are on this page.

Q: Is CVE-2016-1000156 being exploited?

CVE-2016-1000156 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2016-1000156 affect?

CVE-2016-1000156 affects mailcwp. Severity is critical (CVSS 9.8). Mailcwp remote file upload vulnerability incomplete fix v1.100

Q: How urgent is CVE-2016-1000156?

Priority 66/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2016-1000156 is a critical-severity flaw (CVSS 9.8) affecting mailcwp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Mailcwp remote file upload vulnerability incomplete fix v1.100

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.8% (top 13%)
CISA exploited list	No
Weakness	CWE-77, CWE-284
Published	2016-12-14
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: mailcwp project

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

Am I affected?

Timeline

2016-12-14 18:59 UTCPublished CVE record published
2026-06-17 00:38 UTCUpdated Record last modified

mailcwp project mailcwp UPGRADE

Affected: <= 1.100

Fixed in: newer than 1.100

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy mailcwp || rpm -q mailcwp || mailcwp --version

2. UPGRADE to newer than 1.100 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mailcwp

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mailcwp

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2016-1000156?

mailcwp: upgrade to newer than 1.100. Exact commands for each OS are on this page.

Is CVE-2016-1000156 being exploited?

CVE-2016-1000156 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-2016-1000156 affect?

CVE-2016-1000156 affects mailcwp. Severity is critical (CVSS 9.8). Mailcwp remote file upload vulnerability incomplete fix v1.100

How urgent is CVE-2016-1000156?

Priority 66/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2015-1000000 CRITICAL 9.8 DOWNGRADE Remote file upload vulnerability in mailcwp v1.99 wordpress plugin

References

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