CVE-2026-78261: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Realtyna Realtyna Organic IDX plugin

CVE-2026-78261 is an unauthenticated Cross-Site Scripting (XSS) vulnerability in the Realtyna Organic IDX plugin affecting versions up to and including 5.4.1. The flaw stems from improper neutralization of input during web page generation, which could allow an attacker to inject malicious scripts that execute in the context of the victim's browser. The CVSS 3.1 base score is 7.1, reflecting network attack vector, low attack complexity, no privileges required, user interaction required, scope change, and low impact on confidentiality, integrity, and availability. There is no vendor advisory or patch information available at this time, and no known exploits have been reported.

Successful exploitation of this vulnerability could allow an attacker to execute arbitrary scripts in the context of users visiting affected web pages. This can lead to information disclosure, session hijacking, or other impacts related to script execution in the victim's browser. The CVSS score indicates a high severity impact with partial confidentiality, integrity, and availability loss. However, exploitation requires user interaction.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, consider applying web application firewall (WAF) rules to detect and block malicious input patterns related to XSS. Monitor for updates from Realtyna regarding patches or official mitigations.