Registrations for the Events Calendar < 2.7.6 - Unauthenticated SQL Injection

published 2021-12-06 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-11855

cvss: 9.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 7.3%; EPSS 7.3% chance of exploitation in 30 days, percentile 94%
public exploits: 0; none known, plus a Nuclei check

The Registrations for the Events Calendar WordPress plugin before 2.7.6 does not sanitise and escape the event_id in the rtec_send_unregister_link AJAX action (available to both unauthenticated and authenticated users) before using it in a SQL statement, leading to an unauthenticated SQL injection.

Patch / fix

fixed in 1

roundupwp registrations_for_the_events_calendar 2.7.6

Exploit prediction

7.30% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

Nuclei template Registrations for the Events Calendar < 2.7.6 - SQL Injection nuclei detection template
wpscan.com https://wpscan.com/vulnerability/ba50c590-42ee-4523-8aa0-87ac644b77ed referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	7.5	AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

Unknown Registrations for the Events Calendar – Event Registration Plugin

Classification

Weakness

CWE-89 Improper Neutralization of Special Elements used in an SQL Command

Technology feeds

WordPress rss critical rss

References

wpscan.com /vulnerability/ba50c590-42ee-4523-8aa0-87ac644b77ed
exploit, third-party-advisory

Sources

CVE List CVE-2021-24943
NVD CVE-2021-24943

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary