CVE-2017-18543: The invite-anyone plugin before 1.3.16 for WordPress has incorrect access control for email-based invitations.

Q: How do I fix CVE-2017-18543?

invite anyone: upgrade to 1.3.16. Exact commands for each OS are on this page.

Q: Is CVE-2017-18543 being exploited?

CVE-2017-18543 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-2017-18543 affect?

CVE-2017-18543 affects invite anyone. Severity is critical (CVSS 9.8). The invite-anyone plugin before 1.3.16 for WordPress has incorrect access control for email-based invitations.

Q: How urgent is CVE-2017-18543?

Priority 59/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2017-18543 is a critical-severity flaw (CVSS 9.8) affecting invite anyone. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The invite-anyone plugin before 1.3.16 for WordPress has incorrect access control for email-based invitations.

Why this priority

Critical severity
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	1.8% (top 21%)
CISA exploited list	No
Weakness	CWE-284
Published	2019-08-16
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: invite anyone project

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

Am I affected?

Timeline

2019-08-16 21:15 UTCPublished CVE record published
2026-06-17 01:13 UTCUpdated Record last modified

invite anyone project invite anyone UPGRADE

Affected: < 1.3.16

Fixed in: 1.3.16

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy invite-anyone || rpm -q invite-anyone || invite-anyone --version

2. UPGRADE to 1.3.16 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade invite-anyone

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade invite-anyone

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-2017-18543?

invite anyone: upgrade to 1.3.16. Exact commands for each OS are on this page.

Is CVE-2017-18543 being exploited?

CVE-2017-18543 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-2017-18543 affect?

CVE-2017-18543 affects invite anyone. Severity is critical (CVSS 9.8). The invite-anyone plugin before 1.3.16 for WordPress has incorrect access control for email-based invitations.

How urgent is CVE-2017-18543?

Priority 59/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

WordPress vulnerabilities

Related CVEs

CVE-2024-43327 HIGH 7.1 UPGRADE Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in B
CVE-2017-18545 HIGH 7.5 UPGRADE The invite-anyone plugin before 1.3.16 for WordPress has incorrect escaping of untrusted Dashboard and front-e
CVE-2017-18544 HIGH 8.8 UPGRADE The invite-anyone plugin before 1.3.16 for WordPress has admin-panel CSRF.

References

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