{“lastseen”:””,”description”:”Nextcloud is an open source content collaboration platform. From versions 17.0.0 to before 17.0.15, 18.0.0 to before 18.1.12, 19.0.0 to before 19.1.16, 20.0.0 to before 20.1.11, and 21.0.0 to before 21.0.4, a user with READ and CREATE permission, but no UPDATE permission for a team folder can rename files in the team folder. This issue has been patched in versions 17.0.15, 18.1.12, 19.1.16, 20.1.11, and 21.0.4.”,”published”:”2026-06-01T16:36:57.130Z”,”modified”:”2026-06-01T16:36:57.130Z”,”type”:”cve”,”title”:”Nextcloud: ACL Rename Permission Bypass in Team Folders Allows Unauthorized File Renames”,”source”:”GitHub_M”,”references”:”https:\/\/github.com\/nextcloud\/security-advisories\/security\/advisories\/GHSA-wx2x-822r-rvmf\\nhttps:\/\/github.com\/nextcloud\/groupfolders\/pull\/4361\\nhttps:\/\/hackerone.com\/reports\/3540673″,”id”:”CVE-2026-45264″,”bulletinFamily”:””,”cwe”:[“CWE-284″],”cvelist”:null,”sourceData”:”nextcloud security-advisories \\u003e= 17.0.0, \\u003c 17.0.15\\nnextcloud security-advisories \\u003e= 18.0.0, \\u003c 18.1.12\\nnextcloud security-advisories \\u003e= 19.0.0, \\u003c 19.1.16\\nnextcloud security-advisories \\u003e= 20.0.0, \\u003c 20.1.11\\nnextcloud security-advisories \\u003e= 21.0.0, \\u003c 21.0.4″,”sourceHref”:””,”cvss”:{“score”:4.3,”severity”:”MEDIUM”,”vector”:”CVSS:3.1\/AV:N\/AC:L\/PR:L\/UI:N\/S:U\/C:N\/I:L\/A:N”,”version”:”3.1″},”cvss2″:{},”cvss3″:{“version”:””,”vectorString”:””,”baseScore”:0,”baseSeverity”:””,”attackVector”:””,”attackComplexity”:””,”privilegesRequired”:””,”userInteraction”:””,”scope”:””,”confidentialityImpact”:””,”integrityImpact”:””,”availabilityImpact”:””,”cvssV3″:{“version”:””,”vectorString”:””,”baseScore”:0,”baseSeverity”:””,”attackVector”:””,”attackComplexity”:””,”privilegesRequired”:””,”userInteraction”:””,”scope”:””,”confidentialityImpact”:””,”integrityImpact”:””,”availabilityImpact”:””}},”href”:””,”category_name”:”CVE”,”post_link”:””,”product”:”security-advisories”,”version”:”\\u003e= 17.0.0, \\u003c 17.0.15″,”vendor”:”nextcloud”,”ai_description”:””,”ai_severity”:””,”ai_vendor”:””,”ai_product”:””,”ai_version”:””,”ai_score”:0}<\/p>\n","protected":false},"excerpt":{"rendered":"
{“lastseen”:””,”description”:”Nextcloud is an open source content collaboration platform. From versions 17.0.0 to before 17.0.15, 18.0.0 to before 18.1.12, 19.0.0 to before 19.1.16, 20.0.0 to before…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[6,8,123,12,21,13,7,11,5],"class_list":["post-58903","post","type-post","status-publish","format-standard","hentry","category-category_cve","tag-cve","tag-cvss","tag-cvss-43","tag-exploit","tag-medium","tag-news","tag-security","tag-tapic","tag-vulnerability"],"yoast_head":"\n