CVE-2018-11309: Blind SQL injection in coupon_code in the MemberMouse plugin 2.2.8 and prior for WordPress allows an unauthent

Q: How do I fix CVE-2018-11309?

membermouse: upgrade to 2.2.8. Exact commands for each OS are on this page.

Q: Is CVE-2018-11309 being exploited?

CVE-2018-11309 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-2018-11309 affect?

CVE-2018-11309 affects membermouse. Severity is critical (CVSS 9.8). Blind SQL injection in coupon_code in the MemberMouse plugin 2.2.8 and prior for WordPress allows an unauthenticated attacker to dump the WordPress MySQL database via an applyCoupon action in an admin-ajax.php request.

Q: How urgent is CVE-2018-11309?

Priority 65/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2018-11309 is a critical-severity flaw (CVSS 9.8) affecting membermouse. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Blind SQL injection in coupon_code in the MemberMouse plugin 2.2.8 and prior for WordPress allows an unauthenticated attacker to dump the WordPress MySQL database via an applyCoupon action in an admin-ajax.php request.

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	2.1% (top 18%)
CISA exploited list	No
Weakness	CWE-89
Published	2018-05-28
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: membermouse

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

Am I affected?

Timeline

2018-05-28 16:29 UTCPublished CVE record published
2026-06-17 01:35 UTCUpdated Record last modified

membermouse membermouse UPGRADE

Affected: < 2.2.8

Fixed in: 2.2.8

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 2.2.8 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade membermouse

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-2018-11309?

membermouse: upgrade to 2.2.8. Exact commands for each OS are on this page.

Is CVE-2018-11309 being exploited?

CVE-2018-11309 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-2018-11309 affect?

CVE-2018-11309 affects membermouse. Severity is critical (CVSS 9.8). Blind SQL injection in coupon_code in the MemberMouse plugin 2.2.8 and prior for WordPress allows an unauthenticated attacker to dump the WordPress MySQL database via an applyCoupon action in an admin-ajax.php request.

How urgent is CVE-2018-11309?

Priority 65/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

WordPress vulnerabilities · PHP vulnerabilities · MySQL vulnerabilities

References

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