{"id":"CVE-2026-25885","state":"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.","publishedAt":"2026-02-09T21:15:33.419Z","updatedAt":"2026-02-10T15:58:03.240Z","severity":{"score":10,"label":"Critical","version":"4.0","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","source":"GitHub_M"},"assigner":"GitHub_M","products":["polarnl PolarLearn"],"affected":[{"vendor":"polarnl","product":"PolarLearn","versions":[{"version":"< 0-PRERELEASE-16","status":"affected"}]}],"references":["https://github.com/polarnl/PolarLearn/security/advisories/GHSA-gvjm-5pw7-6c8c","https://github.com/polarnl/PolarLearn/commit/3ba588fda0d3f8e238483a20772719f27e52e79f"],"weaknesses":["CWE-285","CWE-306"],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/25xxx/CVE-2026-25885.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-25885","state":"PUBLISHED","datePublished":"2026-02-09T21:15:33.419Z","dateUpdated":"2026-02-10T15:58:03.240Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-02-06T21:08:39.129Z"},"containers":{"cna":{"title":"PolarLearn allows Unauthenticated WebSocket access allows subscribing to and posting in arbitrary group chats","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"polarnl","product":"PolarLearn","versions":[{"version":"< 0-PRERELEASE-16","status":"affected"}]}],"references":[{"url":"https://github.com/polarnl/PolarLearn/security/advisories/GHSA-gvjm-5pw7-6c8c","name":"https://github.com/polarnl/PolarLearn/security/advisories/GHSA-gvjm-5pw7-6c8c","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/polarnl/PolarLearn/commit/3ba588fda0d3f8e238483a20772719f27e52e79f","name":"https://github.com/polarnl/PolarLearn/commit/3ba588fda0d3f8e238483a20772719f27e52e79f","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"LOW","subConfidentialityImpact":"HIGH","subIntegrityImpact":"HIGH","subAvailabilityImpact":"LOW","baseScore":10,"baseSeverity":"CRITICAL","vectorString":"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","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-285","lang":"en","description":"CWE-285: Improper Authorization","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-306","lang":"en","description":"CWE-306: Missing Authentication for Critical Function","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-02-09T21:15:33.419Z"},"source":{"advisory":"GHSA-gvjm-5pw7-6c8c","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-02-10T15:39:32.428972Z","id":"CVE-2026-25885","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-02-10T15:58:03.240Z"}}]}}}