← Vulnerability feed

Vulnerability record · CVE-2021-24876 · published 29 November 2021

CVE-2021-24876: Roundupwp registrations for the events calendar cross-site scripting vulnerability

Roundupwp · Registrations For The Events Calendar

The Registrations for the Events Calendar WordPress plugin before 2.7.5 does not escape the v parameter before outputting it back in an attribute, leading to a Reflected Cross-Site Scripting

6.1 CVSS 3.1 Medium EPSS 1.2% · top 33.1% CWE-79 · Cross-site scripting
6.1CVSS 3.1 base score, v2 4.3
1.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

The Registrations for the Events Calendar WordPress plugin before 2.7.5 does not escape the v parameter before outputting it back in an attribute, leading to a Reflected Cross-Site Scripting

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://wpscan.com/vulnerability/e77c2493-993d-418d-9629-a1f07b5a2b6f ExploitThird Party Advisory
https://wpscan.com/vulnerability/e77c2493-993d-418d-9629-a1f07b5a2b6f ExploitThird Party Advisory

Track CVE-2021-24876 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2021-24943Roundupwp registrations for the events calendar sql injection vulnerabilityThe 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 AJ…EPSS 7.5%9.6CVE-2024-7982Roundupwp registrations for the events calendar cross-site scripting vulnerabilityThe Registrations for the Events Calendar WordPress plugin before 2.12.4 does not sanitise and escape some parameters when accepting event registrati…EPSS 0.69%8.8CVE-2024-39638Roundupwp registrations for the events calendar sql injection vulnerabilityImproper Neutralization of Special Elements used in an SQL Command ('SQL Injection') vulnerability in Roundup WP Registrations for the Events Calenda…EPSS 0.44%6.1CVE-2024-10703Roundupwp registrations for the events calendar cross-site scripting vulnerabilityThe Registrations for the Events Calendar WordPress plugin before 2.13.4 does not sanitise and escape some of its settings, which could allow high pr…EPSS 0.27%6.1CVE-2021-25083Roundupwp registrations for the events calendar cross-site scripting vulnerabilityThe Registrations for the Events Calendar WordPress plugin before 2.7.10 does not escape the qtype parameter before outputting it back in an attribut…EPSS 0.89%6.1CVE-2026-42897Microsoft Exchange Server XSS enables spoofingMicrosoft Exchange Server and Exchange Server Subscription Edition fail to neutralize input during web page generation, a cross-site scripting flaw (…KEVEPSS 0.52%analysed6.1CVE-2025-48700Zimbra Classic UI stored XSS via crafted email HTMLZimbra Collaboration Suite Classic UI fails to properly sanitize HTML content in email messages, allowing crafted tag structures and attribute values…KEVEPSS 1.7%analysed6.1CVE-2025-66376Zimbra Collaboration Classic UI stored XSS via CSS @import in emailZimbra Collaboration Suite 10 before 10.0.18 and 10.1 before 10.1.13 allows stored cross-site scripting in the Classic UI through CSS @import directi…KEVEPSS 20%analysed

Source: NIST National Vulnerability Database (record CVE-2021-24876), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.