CVE-2024-3603 is a stored cross-site scripting vulnerability in the photoweblog OSM – OpenStreetMap WordPress plugin affecting all versions up to 6.0.3. The issue is due to improper neutralization of input during web page generation, specifically insufficient sanitization and output escaping of user-supplied shortcode attributes like 'theme'. Authenticated users with contributor or higher privileges can exploit this to inject arbitrary JavaScript that executes in the context of other users viewing the injected pages. The vulnerability has a CVSS 3.1 base score of 6.4 (AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N), reflecting network attack vector, low attack complexity, required privileges, no user interaction, and partial impact on confidentiality and integrity without availability impact. No patch or vendor advisory is currently available, and no known exploits have been reported.

Successful exploitation allows authenticated contributors or higher to inject persistent malicious scripts into pages via the 'osm_map' shortcode attributes. This can lead to partial confidentiality and integrity compromise for users who view the injected pages, such as session hijacking or unauthorized actions performed in the context of the victim user. There is no impact on availability. The vulnerability requires authenticated access with contributor-level privileges or above.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict contributor-level access to trusted users only and consider disabling or removing the OSM – OpenStreetMap plugin if feasible. Monitor for updates from the photoweblog plugin vendor regarding patches or official mitigations.