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CVE-2017-20273 Joomlashowroom CVE debrief

CVE-2017-20273 is an SQL injection vulnerability in Joomla Event Registration Pro Calendar 4.1.3. Unauthenticated attackers can execute arbitrary SQL queries via the id parameter in GET requests to index.php with option=com_registrationpro&view=category&id. This vulnerability has a CVSS score of 8.8, indicating high severity. Affected systems are exposed to potential database exploitation. Defenders should prioritize patching or mitigating this vulnerability.

Vendor
Joomlashowroom
Product
Event Registration Pro Calendar
CVSS
HIGH 8.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-19
Original CVE updated
2026-08-21
Advisory published
2026-06-19
Advisory updated
2026-08-21

Who should care

Defenders of Joomla Event Registration Pro Calendar 4.1.3 installations should prioritize patching or mitigating this vulnerability. CVSS score of 8.8 indicates high severity, suggesting immediate attention. Unaffected versions and workarounds should be evaluated.

Technical summary

CVE-2017-20273 is an SQL injection vulnerability in Joomla Event Registration Pro Calendar 4.1.3. The vulnerability allows unauthenticated attackers to execute arbitrary SQL queries by injecting malicious code through the id parameter in GET requests to index.php with option=com_registrationpro&view=category&id. CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. This vulnerability is classified under CWE-89.

Defensive priority

High priority due to CVSS score of 8.8 and potential for database exploitation.

Recommended defensive actions

  • Apply official patches or updates for Joomla Event Registration Pro Calendar 4.1.3
  • Review and restrict access to index.php with option=com_registrationpro&view=category&id
  • Implement web application firewall (WAF) rules to detect and prevent SQL injection attempts
  • Monitor for suspicious database activity and review logs for potential exploitation
  • Consider temporary compensating controls if patching is not immediately feasible

Evidence notes

Primary evidence from CVE.org and NVD detail pages confirms the SQL injection vulnerability in Joomla Event Registration Pro Calendar 4.1.3. The vulnerability allows unauthenticated attackers to execute arbitrary SQL queries. Affected product/version/scope: Joomla Event Registration Pro Calendar 4.1.3. Defenders should verify the official CVE record and NVD details for accurate information.

Sources and references

Verified primary and authoritative sources

  • CVE-2017-20273 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2017-20273

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2017-20273 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2017-20273

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.