How severe is CVE-2018-21004?

CVE-2018-21004 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-21004 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-21004?

CVE-2018-21004 affects Carrcommunications Rsvpmaker. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-21004?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2018-21004 published?

CVE-2018-21004 was published on 2019-08-27 and last updated on 2026-06-17.

CVE-2018-21004

CVE-2018-21004 is a critical-severity vulnerability in Carrcommunications Rsvpmaker with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-89.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (81st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-89
Affected product: Carrcommunications Rsvpmaker
Published: 2019-08-27
Last modified: 2026-06-17

Description

The rsvpmaker plugin before 5.6.4 for WordPress has SQL injection.

Frequently asked questions

What is CVE-2018-21004?: The rsvpmaker plugin before 5.6.4 for WordPress has SQL injection.
How severe is CVE-2018-21004?: CVE-2018-21004 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-21004 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-21004?: CVE-2018-21004 affects Carrcommunications Rsvpmaker. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-21004?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2018-21004 published?: CVE-2018-21004 was published on 2019-08-27 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:carrcommunications:rsvpmaker:*:*:*:*:*:wordpress:*:*

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