This vulnerability (CVE-2026-27427) in Geo Mashup involves improper input sanitization leading to stored cross-site scripting (CWE-79). An attacker with low privileges can inject malicious scripts that are stored and later executed in the context of other users. The vulnerability affects all versions up to 1.13.18. The CVSS 3.1 vector indicates network attack vector, low attack complexity, requiring privileges and user interaction, with impacts on confidentiality, integrity, and availability classified as low to low to low respectively, combined to a medium overall score of 6.5. No patch or official remediation level has been published by the vendor as of the publication date.

Successful exploitation allows an attacker to execute arbitrary scripts in the context of users viewing the affected pages, potentially leading to data disclosure, modification, or denial of service. The impact is rated medium severity due to the requirement for privileges and user interaction, and the limited scope of confidentiality, integrity, and availability impacts.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should consider restricting privileges to trusted users and be cautious with user-generated content. Monitor vendor channels for updates regarding patches or official mitigations.