{"metadata": {"vulnerability": "CVE-2026-55876", "count": 10, "kinds": {"milestone": 3, "sighting": 1, "kev": 0, "other": 6}}, "data": [{"timestamp": "2026-06-17T16:59:42.759Z", "date_only": false, "value": "2026-06-17T16:59:42.759Z", "kind": "milestone", "label": "Reserved", "source": "cvelistv5", "record": "CVE-2026-55876", "field": "cveMetadata.dateReserved"}, {"timestamp": "2026-10-15T17:23:07.781Z", "date_only": false, "value": "2026-10-15T17:23:07.781Z", "kind": "milestone", "label": "Published", "source": "cvelistv5", "record": "CVE-2026-55876", "field": "cveMetadata.datePublished", "metric_role": "disclosure", "metric_basis": "recorded_event"}, {"timestamp": "2026-10-15T17:23:07.781Z", "date_only": false, "value": "2026-10-15T17:23:07.781Z", "kind": "other", "label": "Updated", "source": "cvelistv5 / GitHub_M", "record": "CVE-2026-55876", "field": "containers.cna.providerMetadata.dateUpdated"}, {"timestamp": "2026-10-15T17:34:33.564Z", "date_only": false, "value": "2026-10-15T17:34:33.564211Z", "kind": "sighting", "label": "Seen", "source": "https://infosec.exchange/users/cve/statuses/117446126667457130", "record": "CVE-2026-55876", "field": "creation_timestamp", "uuid": "2ff29275-b3c5-46af-a747-7b7e9ed062fe", "content": "CVE-2026-55876 Helium: Stored XSS via Unrestricted SVG File Upload \u2014 Authenticated Users Can Store Executable Scripts 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.\nhttps://www.cve.org/CVERecord?id=CVE-2026-55876https://github.com/HeliumEdu/platform/security/advisories/GHSA-7r65-76fw-ch5chttps://github.com/HeliumEdu/platform/commit/f0de5c985c701942758b805a3d11dfb008a6af88#HeliumEdu #platform#CVE_2026_55876#bot", "url": "https://infosec.exchange/users/cve/statuses/117446126667457130"}, {"timestamp": "2026-10-15T18:17:28.307Z", "date_only": false, "value": "2026-10-15T18:17:28.307", "kind": "milestone", "label": "Published", "source": "fkie_nvd \u00b7 FKIE_CVE-2026-55876", "record": "FKIE_CVE-2026-55876", "field": "published", "metric_role": "disclosure", "metric_basis": "recorded_event"}, {"timestamp": "2026-10-21T01:00:34.594Z", "date_only": false, "value": "2026-10-21T01:00:34.594595Z", "kind": "other", "label": "Recorded", "source": "cvelistv5 / CISA-ADP", "record": "CVE-2026-55876", "field": "containers.adp.0.metrics.0.other.content.timestamp"}, {"timestamp": "2026-10-21T01:00:34.594Z", "date_only": false, "value": "2026-10-21T01:00:34.594595Z", "kind": "other", "label": "Recorded", "source": "fkie_nvd \u00b7 FKIE_CVE-2026-55876", "record": "FKIE_CVE-2026-55876", "field": "metrics.ssvcV203.0.ssvcData.timestamp"}, {"timestamp": "2026-10-21T01:01:03.086Z", "date_only": false, "value": "2026-10-21T01:01:03.086Z", "kind": "other", "label": "Updated", "source": "cvelistv5", "record": "CVE-2026-55876", "field": "cveMetadata.dateUpdated"}, {"timestamp": "2026-10-21T01:01:03.086Z", "date_only": false, "value": "2026-10-21T01:01:03.086Z", "kind": "other", "label": "Updated", "source": "cvelistv5 / CISA-ADP", "record": "CVE-2026-55876", "field": "containers.adp.0.providerMetadata.dateUpdated"}, {"timestamp": "2026-10-21T01:17:39.250Z", "date_only": false, "value": "2026-10-21T01:17:39.250", "kind": "other", "label": "Updated", "source": "fkie_nvd \u00b7 FKIE_CVE-2026-55876", "record": "FKIE_CVE-2026-55876", "field": "lastModified"}], "metrics": {"as_of": "2026-10-29T18:52:21.221Z", "anchors": {"origin": {"timestamp": "2026-10-15T17:23:07.781Z", "date_only": false, "value": "2026-10-15T17:23:07.781Z", "kind": "milestone", "label": "Published", "source": "cvelistv5", "record": "CVE-2026-55876", "field": "cveMetadata.datePublished", "metric_role": "disclosure", "metric_basis": "recorded_event"}, "discovery": null, "report": null, "acknowledgement": null, "disclosure": {"timestamp": "2026-10-15T17:23:07.781Z", "date_only": false, "value": "2026-10-15T17:23:07.781Z", "kind": "milestone", "label": "Published", "source": "cvelistv5", "record": "CVE-2026-55876", "field": "cveMetadata.datePublished", "metric_role": "disclosure", "metric_basis": "recorded_event"}, "exploit_publication": null, "exploitation": null, "patch": null}, "vendor_response_time": {"available": false, "missing": ["start", "end"]}, "time_to_exploit": {"available": false, "missing": ["end"]}, "disclosure_to_exploit": {"available": false, "missing": ["end"]}, "disclosure_to_exploit_publication": {"available": false, "missing": ["end"]}, "time_to_patch": {"available": false, "missing": ["start", "end"]}, "total_time_to_patch": {"available": false, "missing": ["start", "end"]}, "disclosure_to_patch": {"available": false, "missing": ["end"]}, "time_unpatched": {"available": true, "seconds": 1214953.440043, "hours": 337.48706667861114, "days": 14.061961111608797, "min_seconds": 1214953.440043, "max_seconds": 1214953.440043, "approximate": false, "ongoing": true, "order_known": true, "batch_listing": false, "end_before_start": false, "start": {"timestamp": "2026-10-15T17:23:07.781Z", "date_only": false, "value": "2026-10-15T17:23:07.781Z", "kind": "milestone", "label": "Published", "source": "cvelistv5", "record": "CVE-2026-55876", "field": "cveMetadata.datePublished", "metric_role": "disclosure", "metric_basis": "recorded_event"}, "end": {"timestamp": "2026-10-29T18:52:21.221Z", "date_only": false, "label": "As of", "source": "Calculation clock"}}, "exploitation_to_patch": {"available": false, "missing": ["start"]}, "exploit_publication_to_patch": {"available": false, "missing": ["start"]}}}