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ExploitedNot in CISA KEV yetFix available

CVE-2021-24943

Exploitation confirmed. First attested on 2026-03-10 by GCVE · kevintel, GCVE · shadowserver.

  • Published2021-12-06
  • Fixed in2.7.6
  • WeaknessCWE-89

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2021-12-0616:15CVE publishedNVD
  2. 2026-03-10Listed as exploited by GCVEGCVE
  3. 2026-03-10Exploitation first reportedGCVE

Observed activity

isMalicious corpus · updated 2026-11-02 15:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-24943?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-24943?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Roundupwp registrations for the events calendar
BranchAffectedFixed in
2.7< 2.7.62.7.6

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Roundupwp registrations for the events calendar to 2.7.6

Detection

read 2026-11-01 22:42 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

  • GCVEexploitation2026-03-10
  • NVDCVSS 3.19.8read 2026-10-23
  • NVDCVSS 2.07.5read 2026-10-23
  • CNAweakness (CWE)CWE-89known since 2026-10-23
  • FIRST EPSSEPSS score7.3 %2026-11-01
  • ProjectDiscoverydetectionread 2026-11-01

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2021-12-06
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2021-24943?

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.

Is CVE-2021-24943 actively exploited?

Active exploitation of CVE-2021-24943 has not been confirmed. Its EPSS score was 7.3% on 2026-11-01, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-24943?

CVE-2021-24943 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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Sources for this record