{"id":"CVE-2026-55518","summary":"Avo: Missing Authorization in Avo Association Attach Endpoint Allows Unauthorized Relationship Manipulation and Privilege Escalation","details":"Avo is a framework to create admin panels for Ruby on Rails apps. Prior to 3.32.1 and 4.0.0.beta.51, Avo's association attach workflow checks attach_\u003cassociation\u003e? in the UI and GET /resources/:resource/:id/:related/new path, but the actual write endpoint, POST /resources/:resource/:id/:related, does not run the same authorization check before mutating the association through Avo::AssociationsController#create. An authenticated low-privileged Avo user can bypass hidden or disabled attach controls and directly attach related records to a parent record by sending a crafted POST request, which can lead to privilege escalation and cross-tenant data exposure where associations represent authorization-bearing relationships. This issue is fixed in versions 3.32.1 and 4.0.0.beta.51.","aliases":["GHSA-8fq9-273g-6mrg"],"modified":"2026-08-12T03:51:24.630166831Z","published":"2026-07-17T20:51:19.056Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-639","CWE-862","CWE-863"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55518.json","unresolved_ranges":[{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"4.0.0.beta.1"},{"fixed":"4.0.0.beta.51"}]}]},"references":[{"type":"WEB","url":"https://github.com/avo-hq/avo/releases/tag/v3.32.1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55518.json"},{"type":"ADVISORY","url":"https://github.com/avo-hq/avo/security/advisories/GHSA-8fq9-273g-6mrg"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55518"},{"type":"FIX","url":"https://github.com/avo-hq/avo/commit/995928e586fd1788dd496bd51c4dbe4a79cb2b9c"},{"type":"FIX","url":"https://github.com/avo-hq/avo/pull/4568"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/avo-hq/avo","events":[{"introduced":"0"},{"fixed":"995928e586fd1788dd496bd51c4dbe4a79cb2b9c"},{"fixed":"1a8117a1a2a5136de7dc62150f486093f55ae077"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"3.32.1"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["v3.32.0","v3.31.2","v3.31.1","v3.31.0","v3.30.4","v3.30.3","v3.30.2","v3.30.1","v3.30.0","v3.29.1","v3.29.0","v3.28.0","v3.27.0","v3.26.4","v3.26.3","v3.26.2","v3.26.1","v3.26.0","v3.25.3","v3.25.2","v3.25.1","v3.25.0","v3.24.1","v3.24.0","v3.23.1","v3.23.0","v3.22.5","v3.22.4","v3.22.3","v3.22.2","v3.22.1","v3.22.0","v3.21.0","v3.20.3","v3.20.2","v3.20.1","v3.20.0","v3.19.3","v3.19.2","v3.19.1","v3.19.0","v3.18.2","v3.18.0","v3.17.9","v3.17.8","v3.17.7","v3.17.6","v3.17.5","v3.17.4","v3.17.3","v3.17.2","v3.17.1","v3.17.0","v3.16.7","v3.16.6","v3.16.5","v3.16.4","v3.16.3","v3.16.2","v3.16.1","v3.16.0","v3.15.7","v3.15.6","v3.15.5","v3.15.4","v3.15.3","v3.15.2","v3.15.1","v3.14.3","v3.15.0","v3.14.5","v3.14.4","v3.14.2","v3.14.1","v3.14.0","v3.13.7","v3.13.6","v3.13.5","v3.13.4","v3.13.3","v3.13.2","v3.13.1","v3.13.0","v3.12.0","v3.11.10","v3.11.9","v3.11.8","v3.11.7","v3.11.6","v3.11.5","v3.11.4","v3.11.3","v3.11.2","v3.11.1","v3.11.0","v3.10.10","v3.10.9","v3.10.8","v3.10.7","v3.10.6","v3.10.5","v3.10.4","v3.10.3","v3.10.2","v3.10.1","v3.10.0","v3.9.2","v3.9.1","v3.8.2","v3.8.1","v3.8.0","v3.7.4","v3.7.3","v3.7.2","v3.7.1","v3.7.0","v3.6.4","v3.6.3","v3.6.2","v3.4.4","v3.4.3","v3.4.2","v3.4.1","v3.4.0","v3.3.6","v3.3.5","v3.3.4","v3.3.3","v3.3.2","v3.3.1","v3.3.0","v3.2.4","v3.2.3","v3.2.2","v3.2.1","v3.2.0","v3.1.7","v3.1.6","v3.1.5","v3.1.4","v3.1.3","v3.1.2","v3.1.1","v3.1.0","v3.0.8","v3.0.7","v3.0.6","v3.0.5","v3.0.4","v3.0.2","v2.44.0","v2.43.0","v2.42.2","v2.42.1","v2.42.0","v2.41.0","v2.40.0","v2.39.0","v2.38.0","v2.37.2","v2.37.1","v2.37.0","v2.36.3","v2.36.2","v2.36.1","v2.36.0","v2.35.0","v2.34.6","v2.34.5","v2.34.4","v2.34.3","v2.34.2","v2.34.1","v2.34.0","v2.33.3","v2.33.2","v2.33.1","v2.33.0","v2.32.6","v2.32.5","v2.32.4","v2.32.3","v2.32.2","v2.32.1","v2.32.0","v2.31.0","v2.30.2","v2.30.1","v2.30.0","v2.29.1","v2.29.0","v2.28.0","v2.27.1","v2.27.0","v2.26.0","v2.25.0","v2.24.1","v2.24.0","v2.23.2","v2.23.1","v2.23.0","v2.22.0","v2.21.0","v2.20.0","v2.19.0","v2.18.0","v2.17.0","v2.16.0","v2.15.3","v2.15.2","v2.15.1","v2.15.0","v2.14.2","v2.14.1","v2.14.0","v2.13.1","v2.13.0","v2.12.0","v2.11.0","v2.10.2","v2.10.1","v2.10.0","v2.9.0","v2.8.0","v2.7.0","v2.6.0","v2.5.1","v2.5.0","v2.4.1","v2.4.0","v2.3.0","v2.2.2","v2.2.1","v2.2.0","v2.1.1","v2.1.0","v2.0.0","v1.25.0","v1.24.2","v1.24.1","v1.24.0","v1.23.0","v1.22.4","v1.22.3","v1.22.2","v1.22.1","v1.22.0","v1.21.0","v1.20.1","v1.20.0","v1.19.0","v1.18.2","v1.18.1","v1.18.0","v1.17.1","v1.17.0","v1.16.4","v1.16.3","v1.16.2","v1.16.1","v1.16.0","v1.15.0","v1.14.0","v1.13.3","v1.13.0","v1.12.4","v1.12.3","v1.12.2","v1.12.1","v1.12.0","v1.11.6","v1.11.5","v1.11.4","v1.11.3","v1.11.2","v1.11.1","v1.10.3","v1.10.2","v1.10.1","v1.10.0","v1.9.1","v1.9.0","v1.8.4","v1.8.2","v1.8.1","v1.8.0","v1.7.3","v1.7.2","v1.7.1","v1.7.0","v1.6.1","v1.6.0","v1.5.5","v1.5.4","v1.5.3","v1.5.2","v1.5.1","v1.5.0","v1.4.4","v1.4.3","v1.4.2","v1.4.1","v1.4.0","v1.3.5","v1.3.4","v1.3.3","v1.3.1","v1.3.0","v1.2.10","v1.2.9","v1.2.8","v1.2.7","v1.2.6","v1.2.5","v1.2.4","v1.2.3","v1.2.2","v1.2.1","v1.2.0","v1.1.0","v1.1.0.pre.1","v1.0.5","v1.0.4","v1.0.3","v1.0.1","v1.0.0","v0.4.10","v0.4.9","v0.4.8","v0.4.7","v0.4.6","v0.4.5","v0.4.4","v0.4.3","v0.4.2","v0.4.1","v0.4.0","v0.3.2","v0.3.0","v0.2.5","v0.2.4","v0.2.3","v0.2.2","v0.2.1","v0.2.0","v0.1.20","v0.1.19","v0.1.16","v0.1.15","v0.1.14","v0.1.13","v0.1.11","v0.1.9","v0.1.8","v0.1.7","v0.1.6","v0.1.5","v0.1.4","v0.1.3","v0.1.2","v0.1.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55518.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N"}]}