CVE-2023-40203: Missing Authorization vulnerability in MailMunch MailChimp Forms by MailMunch allows Exploiting Incorrectly Co

Q: How do I fix CVE-2023-40203?

mailchimp forms: upgrade to 3.1.5. Exact commands for each OS are on this page.

Q: Is CVE-2023-40203 being exploited?

CVE-2023-40203 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-2023-40203 affect?

CVE-2023-40203 affects mailchimp forms. Severity is medium (CVSS 4.3). Missing Authorization vulnerability in MailMunch MailChimp Forms by MailMunch allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects MailChimp Forms by MailMunch: from n/a through 3.1.4.

Q: How urgent is CVE-2023-40203?

Priority 28/100. No elevated risk signals yet.

Routine

MEDIUM 4.3UPGRADE

CVE-2023-40203 is a medium-severity flaw (CVSS 4.3) affecting mailchimp forms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Missing Authorization vulnerability in MailMunch MailChimp Forms by MailMunch allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects MailChimp Forms by MailMunch: from n/a through 3.1.4.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-862
Published	2024-12-13
Last modified	2026-06-17

Publisher (CNA): Patchstack · Vendor: mailmunch

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

Am I affected?

Timeline

2024-12-13 15:15 UTCPublished CVE record published
2026-06-17 06:16 UTCUpdated Record last modified

mailmunch mailchimp forms UPGRADE

Affected: < 3.1.5

Fixed in: 3.1.5

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy mailchimp-forms || rpm -q mailchimp-forms || mailchimp-forms --version

2. UPGRADE to 3.1.5 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mailchimp-forms

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mailchimp-forms

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-2023-40203?

mailchimp forms: upgrade to 3.1.5. Exact commands for each OS are on this page.

Is CVE-2023-40203 being exploited?

CVE-2023-40203 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-2023-40203 affect?

CVE-2023-40203 affects mailchimp forms. Severity is medium (CVSS 4.3). Missing Authorization vulnerability in MailMunch MailChimp Forms by MailMunch allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects MailChimp Forms by MailMunch: from n/a through 3.1.4.

How urgent is CVE-2023-40203?

Priority 28/100. No elevated risk signals yet.

Related CVEs

CVE-2024-8726 MEDIUM 6.1 UPGRADE The MailChimp Forms by MailMunch plugin for WordPress is vulnerable to Reflected Cross-Site Scripting due to t
CVE-2024-31378 MEDIUM 5.4 UPGRADE Cross-Site Request Forgery (CSRF) vulnerability in MailMunch MailChimp Forms by MailMunch.This issue affects M
CVE-2024-29793 MEDIUM 6.5 UPGRADE Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in MailMunc

References

← Back to latest CVEs