{"id":39995,"date":"2026-10-16T04:34:21","date_gmt":"2026-10-15T20:34:21","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-55876"},"modified":"2026-10-16T04:34:21","modified_gmt":"2026-10-15T20:34:21","slug":"cve-2026-55876","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-55876","title":{"rendered":"CVE-2026-55876 [LOW] &#8211; Helium is a free online student planner for classes, homework, grades, and notes. Prior to"},"content":{"rendered":"<p>Helium is a free online student planner for classes, homework, grades, and notes. Prior to 2.2.60, the POST \/planner\/attachments\/ endpoint allows authenticated users to upload SVG and HTML attachments because conf\/configs\/common.py omits those formats from BLOCKED_ATTACHMENT_EXTENSIONS and BLOCKED_ATTACHMENT_MIME_TYPES, and helium\/planner\/serializers\/attachmentserializer.py relies on those blocklists. An uploaded SVG served as image\/svg+xml can execute embedded script when a visitor opens its public attachment URL, allowing persistent attacker-controlled active content and phishing under an application-managed storage URL. The attachment storage uses a separate origin from the application, so same-origin policy prevents the script from reading application cookies or storage, and application-session compromise is not supported by the maintained deployment configuration. This issue is fixed in version 2.2.60.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Helium is a free online student planner for classes, homework, grades, and notes. Prior to 2.2.60, the POST \/planner\/attachments\/ endpoint allows authenticated users to upload SVG and HTML attachments<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-39995","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/39995","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=39995"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=39995"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=39995"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}