{"id":"CVE-2026-71555","state":"PUBLISHED","title":"PILOS: Reverse tabnabbing in room description","description":"PILOS (Platform for Interactive Live-Online Seminars) is a frontend for BigBlueButton. From 2.1.0 until 4.14.1, PILOS does not send a Cross-Origin-Opener-Policy response header, so pages opened by PILOS via a link that opens a new browsing context (e.g., target=\"_blank\") retain a window.opener reference back to the originating PILOS tab. A malicious destination page reached this way can use window.opener to navigate or manipulate the original PILOS tab, a technique known as reverse tabnabbing, potentially redirecting an authenticated user to a phishing page that mimics PILOS. This issue is fixed in version 4.14.1.","publishedAt":"2026-08-06T21:51:55.890Z","updatedAt":"2026-08-07T17:26:58.575Z","severity":{"score":4.1,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["THM-Health PILOS"],"affected":[{"vendor":"THM-Health","product":"PILOS","versions":[{"version":">= 2.1.0, < 4.14.1","status":"affected"}]}],"references":["https://github.com/THM-Health/PILOS/security/advisories/GHSA-j4wr-p8gh-xrw5","https://github.com/THM-Health/PILOS/commit/b50f2bd07c4f4a7d6a9981578238ae3579275d81","https://github.com/THM-Health/PILOS/releases/tag/v4.14.1"],"weaknesses":["CWE-1022"],"ingestedAt":"2026-10-29T20:12:49.727Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/71xxx/CVE-2026-71555.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-71555","state":"PUBLISHED","datePublished":"2026-08-06T21:51:55.890Z","dateUpdated":"2026-08-07T17:26:58.575Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-08-06T21:24:15.376Z"},"containers":{"cna":{"title":"PILOS: Reverse tabnabbing in room description","descriptions":[{"lang":"en","value":"PILOS (Platform for Interactive Live-Online Seminars) is a frontend for BigBlueButton. From 2.1.0 until 4.14.1, PILOS does not send a Cross-Origin-Opener-Policy response header, so pages opened by PILOS via a link that opens a new browsing context (e.g., target=\"_blank\") retain a window.opener reference back to the originating PILOS tab. A malicious destination page reached this way can use window.opener to navigate or manipulate the original PILOS tab, a technique known as reverse tabnabbing, potentially redirecting an authenticated user to a phishing page that mimics PILOS. This issue is fixed in version 4.14.1."}],"affected":[{"vendor":"THM-Health","product":"PILOS","versions":[{"version":">= 2.1.0, < 4.14.1","status":"affected"}]}],"references":[{"url":"https://github.com/THM-Health/PILOS/security/advisories/GHSA-j4wr-p8gh-xrw5","name":"https://github.com/THM-Health/PILOS/security/advisories/GHSA-j4wr-p8gh-xrw5","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/THM-Health/PILOS/commit/b50f2bd07c4f4a7d6a9981578238ae3579275d81","name":"https://github.com/THM-Health/PILOS/commit/b50f2bd07c4f4a7d6a9981578238ae3579275d81","tags":["x_refsource_MISC"]},{"url":"https://github.com/THM-Health/PILOS/releases/tag/v4.14.1","name":"https://github.com/THM-Health/PILOS/releases/tag/v4.14.1","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.1,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-1022","lang":"en","description":"CWE-1022: Use of Web Link to Untrusted Target with window.opener Access","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-08-06T21:51:55.890Z"},"source":{"advisory":"GHSA-j4wr-p8gh-xrw5","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-07T17:25:46.465635Z","id":"CVE-2026-71555","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-07T17:26:58.575Z"}}]}}}