MC4WP: Mailchimp for WordPress < 4.15.0 - Unauthenticated Subscription Audience Override
- Exploited
- No known exploitation
- Fix
- Fixed in 4.15.0
- Who is exposed
- Not reported
Do first: Upgrade to a fixed version: 4.15.0.
- Last modified
- FIRST's estimate of the chance attackers exploit it in the next 30 days, updated daily.What do these mean? →
- 0.14% · 3rd percentile
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 25/100 · provisional
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: yes
- Technical impact: partial
Summary
The MC4WP: Mailchimp for WordPress plugin, used to add sign-up forms to WordPress sites, has a flaw that lets an unauthenticated visitor subscribe any email address to a different Mailchimp audience than the one the site owner set up. An attacker could use this to add arbitrary addresses to other lists in the site's connected Mailchimp account.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
Read the original description
The MC4WP: Mailchimp for WordPress plugin before 4.15.0 does not validate that the Mailchimp audience a sign-up form or bundled integration subscribes a visitor to matches the audience configured by the site owner, allowing unauthenticated visitors to subscribe arbitrary email addresses to any other audience in the site's connected Mailchimp account.
cve.now Index
- Exploitation0/40No signal
- Exposure20/25No login or user action needed per the CVSS vector, CISA rates it automatable · Unknown: No advisory context yet
- Reach?/20Unknown. No tracked technology or package matched
- Severity5.3/10CVSS 5.3
- No patch0/5No signal
What would change the score
- Would score about 70 if added to CISA KEV
- Would score about 65 if CISA's SSVC rates exploitation active
- Would score about 30 if advisories confirm default setups are exposed
What to do
Upgrade to a fixed version: 4.15.0.
Timeline
- CVE published
- First seen by cve.now
- CISA SSVC assessment
Exploitation: none · Automatable: yes · Technical impact: partial
- Record last updated
Affected versions
- Unknown MC4WP: Mailchimp for WordPress
fixed in 4.15.0
Evidence 1
- Exploit
Corrections
None so far.
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Questions about CVE-2026-118167
Is CVE-2026-118167 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
Which versions are affected by CVE-2026-118167?
MC4WP: Mailchimp for WordPress: before 4.15.0.Source: cve.now feed data
How do I fix CVE-2026-118167?
Upgrade to a fixed version: 4.15.0.Source: cve.now feed data