CVE-2015-1000000: Remote file upload vulnerability in mailcwp v1.99 wordpress plugin

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2015-1000000 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.

Remote file upload vulnerability in mailcwp v1.99 wordpress plugin

Why this priority

Critical severity
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	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	3.0% (top 13%)
CISA exploited list	No
Weakness	CWE-434
Published	2016-10-06
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

2016-10-06 14:59 UTCPublished CVE record published
2026-06-17 00:21 UTCUpdated Record last modified

mailcwp project mailcwp DOWNGRADE

Affected: 1.99

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.99

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.99 (Debian / Ubuntu)

apt-cache madison mailcwp sudo apt install mailcwp=<VERSION_BEFORE_1.99> sudo apt-mark hold mailcwp

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

dnf --showduplicates list mailcwp sudo dnf downgrade mailcwp-<VERSION_BEFORE_1.99> sudo dnf versionlock add mailcwp

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.

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-2015-1000000?

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

Is CVE-2015-1000000 being exploited?

CVE-2015-1000000 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-2015-1000000 affect?

CVE-2015-1000000 affects mailcwp. Severity is critical (CVSS 9.8). Remote file upload vulnerability in mailcwp v1.99 wordpress plugin

How urgent is CVE-2015-1000000?

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

Software pages

WordPress vulnerabilities

Related CVEs

CVE-2016-1000156 CRITICAL 9.8 UPGRADE Mailcwp remote file upload vulnerability incomplete fix v1.100

References

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