{"id":"CVE-2026-25885","aliases":["EUVD-2026-6867","GHSA-gvjm-5pw7-6c8c"],"status":"published","title":"PolarLearn allows Unauthenticated WebSocket access allows subscribing to and posting in arbitrary group chats","description":"PolarLearn is a free and open-source learning program. In 0-PRERELEASE-16 and earlier, the group chat WebSocket at wss://polarlearn.nl/api/v1/ws can be used without logging in. An unauthenticated client can subscribe to any group chat by providing a group UUID, and can also send messages to any group. The server accepts the message and stores it in the group’s chatContent, so this is not just a visual spam issue.","severity":{"version":"4.0","score":10,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.0034,"percentile":0.27827,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-285","CWE-306"],"published":"2026-02-09T21:15:33Z","modified":"2026-11-02T10:31:01Z","products":[{"vendor":"polarlearn","product":"polarlearn"},{"vendor":"polarnl","product":"polarlearn"}],"references":[{"url":"https://github.com/polarnl/PolarLearn/security/advisories/GHSA-gvjm-5pw7-6c8c","tags":["x_refsource_CONFIRM","Exploit","Vendor Advisory","advisory"]},{"url":"https://github.com/polarnl/PolarLearn/commit/3ba588fda0d3f8e238483a20772719f27e52e79f","tags":["x_refsource_MISC","Patch","fix"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25885.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-25885","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-25885","title":"PolarLearn allows Unauthenticated WebSocket access allows subscribing to and posting in arbitrary group chats","description":"PolarLearn is a free and open-source learning program. In 0-PRERELEASE-16 and earlier, the group chat WebSocket at wss://polarlearn.nl/api/v1/ws can be used without logging in. An unauthenticated client can subscribe to any group chat by providing a group UUID, and can also send messages to any group. The server accepts the message and stores it in the group’s chatContent, so this is not just a visual spam issue.","status":"published","published":"2026-02-09T21:15:33.419Z","modified":"2026-02-10T15:58:03.24Z","cvss":[{"version":"4.0","score":10,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L","level":"critical","assessor":"cna"}],"cwes":["CWE-285","CWE-306"],"updated_at":"2026-11-02T13:41:30.911526Z"}],"euvd":[{"id":"EUVD-2026-6867","description":"PolarLearn is a free and open-source learning program. In 0-PRERELEASE-16 and earlier, the group chat WebSocket at wss://polarlearn.nl/api/v1/ws can be used without logging in. An unauthenticated client can subscribe to any group chat by providing a group UUID, and can also send messages to any group. The server accepts the message and stores it in the group’s chatContent, so this is not just a visual spam issue.","status":"published","published":"2026-02-09T21:15:33Z","modified":"2026-02-10T15:58:03Z","cvss":[{"version":"4.0","score":10,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L","level":"critical"}],"updated_at":"2026-11-02T19:48:42.087959Z"}],"nvd":[{"id":"CVE-2026-25885","description":"PolarLearn is a free and open-source learning program. In 0-PRERELEASE-16 and earlier, the group chat WebSocket at wss://polarlearn.nl/api/v1/ws can be used without logging in. An unauthenticated client can subscribe to any group chat by providing a group UUID, and can also send messages to any group. The server accepts the message and stores it in the group’s chatContent, so this is not just a visual spam issue.","status":"published","published":"2026-02-09T22:16:03.583Z","modified":"2026-06-17T10:25:22.823Z","cvss":[{"version":"4.0","score":10,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"critical","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"primary"}],"cwes":["CWE-285","CWE-306"],"updated_at":"2026-11-02T14:12:05.52517Z"}],"osv":[{"id":"CVE-2026-25885","title":"PolarLearn allows Unauthenticated WebSocket access allows subscribing to and posting in arbitrary group chats","description":"PolarLearn is a free and open-source learning program. In 0-PRERELEASE-16 and earlier, the group chat WebSocket at wss://polarlearn.nl/api/v1/ws can be used without logging in. An unauthenticated client can subscribe to any group chat by providing a group UUID, and can also send messages to any group. The server accepts the message and stores it in the group’s chatContent, so this is not just a visual spam issue.","status":"published","published":"2026-02-09T21:15:33.419Z","modified":"2026-11-02T10:31:01.545194763Z","cvss":[{"version":"4.0","score":10,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L","level":"critical"}],"cwes":["CWE-285","CWE-306"],"updated_at":"2026-11-02T15:44:59.80315Z"}]}}