---
id: CVE-2017-20273
title: >-
  Joomla Event Registration Pro Calendar 4.1.3 contains an SQL injection
  vulnerability that allows unauthenticated attackers to execute arbitrary SQL
  queries by injecting malicious code through the id parameter
summary: >-
  Joomla Event Registration Pro Calendar 4.1.3 contains an SQL injection
  vulnerability that allows unauthenticated attackers to execute arbitrary SQL
  queries by injecting malicious code through the id parameter. Attackers can
  send GET requ…
severity: high
cvss: 8.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N'
cwe:
  - CWE-89
vendor: joomalshowroom
product: event_registration_pro_calendar
affected:
  - event_registration_pro_calendar = 4.1.3
published: '2026-06-19'
updated: '2026-08-21'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2017-20273'
references:
  - url: 'https://www.exploit-db.com/exploits/42416'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/joomla-event-registration-pro-calendar-sql-injection
    label: disclosure@vulncheck.com
tags:
  - nvd
epss: 0.00294
epssPercentile: 0.22222
ingestedAt: '2026-08-22T13:32:34.784Z'
---

## Overview

Joomla Event Registration Pro Calendar 4.1.3 contains an SQL injection vulnerability that allows unauthenticated attackers to execute arbitrary SQL queries by injecting malicious code through the id parameter. Attackers can send GET requests to index.php with option=com_registrationpro&view=category&id parameter containing SQL injection payloads to extract sensitive database information.

## Affected

- `event_registration_pro_calendar = 4.1.3`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.