{"id":"CVE-2026-53536","summary":"Activepieces: Cross-tenant file download via missing JWT audience check on step-files signed URL","details":"Activepieces is an open source AI workflow automation platform. Prior to 0.83.0, the /v1/step-files/signed download endpoint verified the supplied JWT against the shared signing secret but did not check the token's audience, and combined with a missing null-check on the decoded fileId, this allowed any caller holding any valid Activepieces JWT (including a freshly created user's own access token) to receive a step-file belonging to another tenant. The file returned was whatever PostgreSQL happened to scan first for type = FLOW_STEP_FILE, varying over time as the database changed, so an authenticated user could obtain step-file attachments belonging to other tenants on the same instance; the attacker could not target a specific victim or file, and the access was read-only with no integrity or availability impact. This issue is fixed in version 0.83.0.","aliases":["GHSA-9723-fmff-mc24"],"modified":"2026-07-19T03:30:51.707796587Z","published":"2026-07-16T18:48:30.875Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53536.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-345","CWE-639"]},"references":[{"type":"WEB","url":"https://github.com/activepieces/activepieces/releases/tag/0.83.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53536.json"},{"type":"ADVISORY","url":"https://github.com/activepieces/activepieces/security/advisories/GHSA-9723-fmff-mc24"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53536"},{"type":"FIX","url":"https://github.com/activepieces/activepieces/commit/2cb6148010a6c2a22900f4c8b08d75cc5c921d1c"},{"type":"FIX","url":"https://github.com/activepieces/activepieces/commit/afe852f60e39fcc6273d41e11f0765586b5a0e49"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/activepieces/activepieces","events":[{"introduced":"0"},{"fixed":"2cb6148010a6c2a22900f4c8b08d75cc5c921d1c"},{"fixed":"afe852f60e39fcc6273d41e11f0765586b5a0e49"},{"fixed":"4b3c13f3ae3f0d4a92ed790f47a03ffbfb9d92cc"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"0"},{"fixed":"0.83.0"}]}}],"versions":["0.75.0","0.82.0","0.82.0-rc.1","0.80.1","0.80.0","0.80.0-rc","0.79.0","0.78.2","0.78.1","0.78.0","0.77.6","0.77.5","0.77.4","0.77.3","0.77.2","0.76.2","0.77.1","0.74.4","0.74.3","0.76.0","0.74.0","0.73.0","0.72.3","0.72.2","0.72.1","0.72.0","0.71.4","0.71.3","0.71.1","0.71.0","0.70.8","0.70.7","0.70.6","0.70.5","0.70.4","0.70.3","0.70.2","0.70.1","0.69.0","0.70.0","0.67.2","0.68.2","0.68.3","0.68.0","0.68.1","0.67.6","0.67.5","0.67.4","0.67.3","0.67.1","0.67.0","0.66.7","0.66.6","0.66.5","0.66.4","0.66.3","0.65.0","0.66.2","0.66.1","0.66.0","0.64.2","0.64.1","0.64.0","0.63.0","0.64.0-rc.0","0.60.2","0.60.0","0.59.0","0.57.1","0.57.0","0.56.0","0.54.0","0.53.1","0.53.0","0.50.12","0.50.11","0.50.10","0.50.9","0.50.8","0.50.7","0.50.5","0.50.4","0.50.3","0.50.2","0.50.1","0.50.0","0.49.0","0.48.7","0.49.0-rc.0","0.48.6","0.48.3","0.48.2","0.48.1","0.48.0","0.47.4","0.47.2","0.46.7","0.46.6","0.46.5","0.46.3","0.46.0","0.45.1","0.45.0","0.42.0","0.42.0-rc.1","0.41.0","0.41.0-rc.1","0.39.9","0.39.7","0.39.6","0.39.5","0.39.4","0.39.3","0.39.2","0.39.1","0.39.0","0.38.6","0.38.3","0.38.2","0.38.1","0.38.0","0.37.6","0.37.5","0.37.4","0.37.3","0.37.2","0.37.1","0.37.0","0.36.4","0.36.3","0.36.2","0.36.1","0.36.0","0.35.1","0.35.0","0.34.11","0.30.0-rc.8","0.30.0-rc.7","0.30.0-rc.6","0.30.0-rc.5","0.30.0-rc.4","0.30.0-rc.3","0.30.0-rc.1","0.29.1","0.29.0","0.29.0-rc.3","0.29.0-rc.1","0.28.0-rc.1","0.28.0","0.27.0","0.27.0-rc.8","0.27.0-rc.7","0.27.0-rc.6","0.27.0-rc.5","0.27.0-rc.4","0.27.0-rc.3","0.27.0-rc.2","0.27.0-rc.1","0.26.1","0.26.0","0.26.0-rc.3","0.26.0-rc.2","0.26.0-rc.1","0.25.0","0.25.1","0.24.1","0.24.0","0.23.0","0.23.0-rc.2","0.23.0-rc.1","0.22.0-rc.4","0.22.0-rc.3","0.22.0-rc.1","0.21.0","0.21.0-rc.4","0.21.0-rc.2","0.21.0-rc.1","0.20.3","0.20.2","0.20.1","0.20.0","0.20.0-rc.4","0.20.0-rc.3","0.20.0-rc.2","0.19.0","0.19.0-rc.4","0.19.0-rc.3","0.19.0-rc.2","0.19.0-rc.1","0.18.2","0.18.1","0.18.0","0.18.0-rc.1","0.17.0","0.16.0","0.16.0-rc.3","0.16.0-rc.2","0.16.0-rc.1","0.15.0","0.15.0-rc.8","0.15.0-rc.7","0.15.0-rc.6","0.15.0-rc.4","0.15.0-rc.5","0.15.0-rc.3","0.15.0-rc.2","0.7.0","0.4.0","0.3.15","0.3.6","0.3.5","0.3.3","0.2.5","0.2.0","0.1.3"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53536.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"}]}