{"id":"CVE-2026-86112","summary":"BookWyrm through 0.9.1 Missing Authorization on the Favorite and Unfavorite Endpoints","details":"BookWyrm through 0.9.1 fails to validate user visibility permissions in the Favorite and Unfavorite views, allowing authenticated attackers to favorite or unfavorite followers-only and direct statuses they cannot access. Attackers can POST to the favorite endpoint with a status ID to create unauthorized interactions, trigger ActivityPub broadcasts, and enumerate private status IDs through response differentiation.","modified":"2026-09-07T03:45:29.927348049Z","published":"2026-09-05T09:59:04.004Z","database_specific":{"cwe_ids":["CWE-639"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86112.json","cna_assigner":"VulnCheck"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86112.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-86112"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/bookwyrm-through-0.9.1-missing-authorization-on-the-favorite-and-unfavorite-endpoints"},{"type":"PACKAGE","url":"https://github.com/bookwyrm-social/bookwyrm"},{"type":"ARTICLE","url":"https://github.com/bookwyrm-social/bookwyrm/blob/v0.9.1/bookwyrm/views/interaction.py"},{"type":"ARTICLE","url":"https://github.com/geo-chen/oss/blob/main/bookwyrm.md#finding-2-authenticated-idor-in-favoriteunfavorite-allows-interaction-with-private-statuses"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/bookwyrm-social/bookwyrm","events":[{"introduced":"0"},{"fixed":"f4246d246d474939298fb49d715904ea38b4cb81"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"last_affected":"0.9.1"},{"fixed":"0.9.1"}],"source":["AFFECTED_FIELD","DESCRIPTION"]}}],"versions":["v0.9.0","v0.8.7","v0.8.6","v0.7.4","v0.7.3","v0.7.2","v0.7.1","v0.6.6","v0.6.5","v0.6.4","v0.6.3","v0.6.2","v0.6.1","v0.6.0","v0.5.5","v0.5.4","v0.5.3","v0.5.2","v0.5.1","v0.5.0","v0.4.6","v0.4.5","v0.4.4","v0.4.3","v0.4.2","0.4.2","v0.4.1","v0.4.0","v0.3.4","v0.3.3","v0.3.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-86112.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"}]}