CVE-2026-4429 is a stored cross-site scripting vulnerability in the photoweblog OSM – OpenStreetMap WordPress plugin affecting all versions up to 6.1.15. The issue occurs due to improper neutralization of input in the 'marker_name' and 'file_color_list' shortcode attributes of the [osm_map_v3] shortcode, allowing authenticated users with Contributor-level permissions or higher to inject arbitrary web scripts. These scripts execute in the context of any user who views the compromised page, potentially leading to session hijacking or other script-based attacks. The vulnerability has a CVSS 3.1 base score of 6.4 (medium severity), with attack vector network, low attack complexity, privileges required at the contributor level, no user interaction needed, and impacts confidentiality and integrity with no impact on availability. No vendor patch or official remediation has been published yet.

An authenticated attacker with Contributor-level access or higher can inject persistent malicious scripts into pages via vulnerable shortcode attributes. These scripts execute in the browsers of users who view the affected pages, potentially leading to unauthorized actions such as session hijacking or data manipulation. The confidentiality and integrity of user data may be compromised, but availability is not affected. There are no known exploits in the wild currently.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict Contributor-level access to trusted users only and consider disabling or removing the vulnerable shortcode attributes if possible. Monitor official vendor channels for updates and apply patches promptly once available.