CVE-2017-20269: Joomla KissGallery 1.0.0 SQL Injection – Remote Data Extraction

Technical summary

CVE-2017-20269 is an SQL injection vulnerability in KissGallery 1.0.0 stemming from insufficient input validation (CWE-89). The component accepts unsanitized input through its URL path and passes it directly into SQL queries. An attacker can manipulate the kissgallery endpoint parameter to inject arbitrary SQL syntax, enabling SELECT statements to exfiltrate database records, user credentials, or other sensitive content. The vulnerability has a CVSS 3.1 score of 8.2 (High), with network-based attack vector, low complexity, and no authentication requirement. Confidentiality impact is high; integrity impact is limited; availability is not directly impacted.

Business impact

Organizations relying on KissGallery for photo galleries or media management face unauthorized data disclosure. Attackers can extract customer records, user credentials, administrative details, and any other information stored in the Joomla database without triggering login alerts or requiring valid credentials. This exposure can lead to compliance violations (GDPR, HIPAA, PCI-DSS depending on data stored), reputational damage, and potential downstream account takeover if credentials are compromised. The attack leaves minimal forensic traces if query logging is not enabled.

Affected systems

Joomla! installations running the KissGallery component version 1.0.0 are directly affected. Any Joomla site with this component active is vulnerable, regardless of Joomla core version. Sites running older Joomla versions or those that extended support for KissGallery beyond official end-of-life are at continued risk if they have not removed or patched the component.

Exploitability

This vulnerability is highly exploitable. No authentication is required, the attack vector is over the network, and the attack complexity is low. An attacker needs only to craft a URL with malicious SQL syntax and send it to the target site—no special tools, credentials, or user interaction are needed. Public proof-of-concept demonstrations would likely be trivial to develop, making it attractive to both opportunistic scanners and targeted attackers. The vulnerability likely affects many older Joomla installations where component maintenance may have been neglected.

Remediation

Immediately disable or uninstall the KissGallery component version 1.0.0 if it is not essential to operations. Verify against the vendor advisory for any patched version; if one exists, upgrade to the patched release. If the component is no longer maintained, remove it and replace it with an actively supported gallery solution. After remediation, conduct a database security audit to assess whether any unauthorized queries were executed and whether sensitive data was accessed.

Patch guidance

Check the official Joomla Extensions Directory and KissGallery vendor repository for available patches or updated versions. The vulnerability disclosure date (June 2026) should prompt the component maintainer to release a security update; verify the patch version against the vendor's official advisory before deployment. If no patch is available from the vendor, treat removal as the primary remediation strategy. Test any patch thoroughly in a staging environment before production rollout to ensure compatibility with your specific Joomla configuration.

Detection guidance

Monitor web server access logs for requests to the kissgallery endpoint containing SQL keywords (SELECT, UNION, OR, AND, quotes, comments like -- or /*). Enable database query logging and review for unexpected SELECT statements accessing sensitive tables (jos_users, jos_usergroups, custom user tables). Intrusion detection systems should flag HTTP requests to the vulnerable endpoint with SQL metacharacters. Perform a baseline scan with web vulnerability scanners configured to detect SQL injection; any positive results warrant immediate investigation.

Why prioritize this

This vulnerability ranks as high priority due to the combination of high CVSS score (8.2), zero authentication requirement, unauthenticated remote exploitability, and direct impact on data confidentiality. SQL injection vulnerabilities are among the most dangerous classes of flaws and frequently exploited by automated tools. The KissGallery component's age and potential presence on legacy installations suggest this vulnerability may already be actively exploited in the wild, making it a strong candidate for urgent response.

Risk score, explained

The CVSS 3.1 score of 8.2 reflects a high-severity vulnerability due to: network-based attack vector (AV:N) with no authentication requirement (PR:N), low attack complexity (AC:L), no user interaction needed (UI:N), and high confidentiality impact (C:H). The limited integrity impact (I:L) and no availability impact (A:N) prevent a critical rating, but the ease of exploitation and direct path to sensitive data extraction justify the high classification.

Frequently asked questions