CVE-2026-27356: Missing Authorization vulnerability in ibericode MC4WP mailchimp-for-wp allows Exploiting Incorrectly Configur

Q: How do I fix CVE-2026-27356?

mc4wp: upgrade to newer than 4.14.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-27356 being exploited?

CVE-2026-27356 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-2026-27356 affect?

CVE-2026-27356 affects mc4wp. Severity is medium (CVSS 5.3). Missing Authorization vulnerability in ibericode MC4WP mailchimp-for-wp allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects MC4WP: from n/a through 4.14.1.

Q: How urgent is CVE-2026-27356?

Priority 19/100. No elevated risk signals yet.

Routine

MEDIUM 5.3UPGRADE

CVE-2026-27356 is a medium-severity flaw (CVSS 5.3) affecting mc4wp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Missing Authorization vulnerability in ibericode MC4WP mailchimp-for-wp allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects MC4WP: from n/a through 4.14.1.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
EPSS exploit chance	n/a
CISA exploited list	No
Weakness	CWE-862
Published	2026-11-06
Last modified	2026-11-06

Publisher (CNA): Patchstack · Vendor: ibericode · Source: CVE Program record (NVD analysis pending)

Last updated 2026-11-06 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-11-06 22:31 UTCPublished CVE record published
2026-11-06 22:31 UTCUpdated Record last modified

ibericode mc4wp UPGRADE

Affected: <= 4.14.1

Fixed in: newer than 4.14.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy mc4wp || rpm -q mc4wp || mc4wp --version

2. UPGRADE to newer than 4.14.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mc4wp

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mc4wp

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-2026-27356?

mc4wp: upgrade to newer than 4.14.1. Exact commands for each OS are on this page.

Is CVE-2026-27356 being exploited?

CVE-2026-27356 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-2026-27356 affect?

CVE-2026-27356 affects mc4wp. Severity is medium (CVSS 5.3). Missing Authorization vulnerability in ibericode MC4WP mailchimp-for-wp allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects MC4WP: from n/a through 4.14.1.

How urgent is CVE-2026-27356?

Priority 19/100. No elevated risk signals yet.

References

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