{"id":"CVE-2026-93955","aliases":["EUVD-2026-83611","GHSA-frhf-rqp4-m3jc"],"status":"published","title":"grimmory-tools grimmory Download Endpoint KoboController.java streamFileToResponse authorization","description":"A vulnerability was detected in grimmory-tools grimmory up to 3.3.3/3.4.1. Affected by this vulnerability is the function streamFileToResponse of the file backend/src/main/java/org/booklore/controller/KoboController.java of the component Download Endpoint. Performing a manipulation of the argument bookId results in authorization bypass. The attack may be initiated remotely. The exploit is now public and may be used. Issue #2431 is closed as completed, but its only comment states that the issue “has already been reported elsewhere.” No fixing commit or pull request is identified there.","severity":{"version":"4.0","score":5.3,"vector":"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/E:P","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00414,"percentile":0.3613,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-285","CWE-639"],"published":"2026-09-19T22:15:09Z","modified":"2026-10-28T02:30:23Z","products":[{"vendor":"grimmory-tools","product":"grimmory"}],"references":[{"url":"https://vuldb.com/vuln/407914","tags":["vdb-entry","technical-description","advisory"]},{"url":"https://vuldb.com/vuln/407914/cti","tags":["signature","permissions-required","report"]},{"url":"https://vuldb.com/cve/CVE-2026-93955","tags":["third-party-advisory","advisory"]},{"url":"https://vuldb.com/submit/943921","tags":["third-party-advisory","advisory"]},{"url":"https://github.com/grimmory-tools/grimmory/issues/2431","tags":["exploit","issue-tracking","report"]},{"url":"https://github.com/grimmory-tools/grimmory/issues/2431#issuecomment-5384402858","tags":["issue-tracking","exploit","report"]},{"url":"https://github.com/grimmory-tools/grimmory/","tags":["product","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93955","tags":["advisory"]},{"url":"https://github.com/grimmory-tools/grimmory"},{"url":"https://github.com/advisories/GHSA-frhf-rqp4-m3jc"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93955.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-93955","title":"grimmory-tools grimmory Download Endpoint KoboController.java streamFileToResponse authorization","description":"A vulnerability was detected in grimmory-tools grimmory up to 3.3.3/3.4.1. Affected by this vulnerability is the function streamFileToResponse of the file backend/src/main/java/org/booklore/controller/KoboController.java of the component Download Endpoint. Performing a manipulation of the argument bookId results in authorization bypass. The attack may be initiated remotely. The exploit is now public and may be used. Issue #2431 is closed as completed, but its only comment states that the issue “has already been reported elsewhere.” No fixing commit or pull request is identified there.","status":"published","published":"2026-09-19T22:15:09.092Z","modified":"2026-09-21T20:20:23.567Z","cvss":[{"version":"4.0","score":5.3,"vector":"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/E:P","level":"medium","assessor":"cna"},{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:P/RL:X/RC:R","level":"medium","assessor":"cna"},{"version":"3.0","score":4.3,"vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:P/RL:X/RC:R","level":"medium","assessor":"cna"},{"version":"2.0","score":4,"vector":"AV:N/AC:L/Au:S/C:P/I:N/A:N/E:POC/RL:ND/RC:C","assessor":"cna"}],"cwes":["CWE-639","CWE-285"],"updated_at":"2026-11-02T14:19:54.50686Z"}],"euvd":[{"id":"EUVD-2026-83611","description":"A vulnerability was detected in grimmory-tools grimmory up to 3.3.3/3.4.1. Affected by this vulnerability is the function streamFileToResponse of the file backend/src/main/java/org/booklore/controller/KoboController.java of the component Download Endpoint. Performing a manipulation of the argument bookId results in authorization bypass. The attack may be initiated remotely. The exploit is now public and may be used. Issue #2431 is closed as completed, but its only comment states that the issue “has already been reported elsewhere.” No fixing commit or pull request is identified there.","status":"published","published":"2026-09-19T22:15:09Z","modified":"2026-09-21T20:20:23Z","cvss":[{"version":"4.0","score":5.3,"vector":"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/E:P","level":"medium"}],"updated_at":"2026-11-02T17:28:04.224689Z"}],"ghsa":[{"id":"GHSA-frhf-rqp4-m3jc","title":"A vulnerability was detected in grimmory-tools grimmory up to 3.3.3/3.4.1. Affected by this...","description":"A vulnerability was detected in grimmory-tools grimmory up to 3.3.3/3.4.1. Affected by this vulnerability is the function streamFileToResponse of the file backend/src/main/java/org/booklore/controller/KoboController.java of the component Download Endpoint. Performing a manipulation of the argument bookId results in authorization bypass. The attack may be initiated remotely. The exploit is now public and may be used. Issue #2431 is closed as completed, but its only comment states that the issue “has already been reported elsewhere.” No fixing commit or pull request is identified there.","status":"published","published":"2026-09-20T00:30:23Z","modified":"2026-09-20T00:30:31Z","cvss":[{"version":"4.0","score":2.1,"vector":"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/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"low"},{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"cwes":["CWE-285"],"updated_at":"2026-11-02T15:12:13.368323Z"}],"nvd":[{"id":"CVE-2026-93955","description":"A vulnerability was detected in grimmory-tools grimmory up to 3.3.3/3.4.1. Affected by this vulnerability is the function streamFileToResponse of the file backend/src/main/java/org/booklore/controller/KoboController.java of the component Download Endpoint. Performing a manipulation of the argument bookId results in authorization bypass. The attack may be initiated remotely. The exploit is now public and may be used. Issue #2431 is closed as completed, but its only comment states that the issue “has already been reported elsewhere.” No fixing commit or pull request is identified there.","status":"published","published":"2026-09-19T23:17:09.077Z","modified":"2026-09-21T21:17:20.133Z","cvss":[{"version":"4.0","score":2.1,"vector":"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/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"low","assessor":"secondary"},{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"secondary"},{"version":"2.0","score":4,"vector":"AV:N/AC:L/Au:S/C:P/I:N/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-285","CWE-639"],"updated_at":"2026-11-02T14:12:50.043898Z"}],"osv":[{"id":"CVE-2026-93955","title":"grimmory-tools grimmory Download Endpoint KoboController.java streamFileToResponse authorization","description":"A vulnerability was detected in grimmory-tools grimmory up to 3.3.3/3.4.1. Affected by this vulnerability is the function streamFileToResponse of the file backend/src/main/java/org/booklore/controller/KoboController.java of the component Download Endpoint. Performing a manipulation of the argument bookId results in authorization bypass. The attack may be initiated remotely. The exploit is now public and may be used. Issue #2431 is closed as completed, but its only comment states that the issue “has already been reported elsewhere.” No fixing commit or pull request is identified there.","status":"published","published":"2026-09-19T22:15:09.092Z","modified":"2026-10-28T02:30:23.387462619Z","cvss":[{"version":"4.0","score":2.1,"vector":"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/E:P","level":"low"}],"cwes":["CWE-285","CWE-639"],"updated_at":"2026-11-02T15:45:20.931171Z"}]}}