{"id":"CVE-2026-93955","title":"A vulnerability was detected in grimmory-tools grimmory up to 3.3.3/3.4.1","summary":"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…","severity":"medium","cvss":4.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","cwe":["CWE-285","CWE-639"],"vendor":"grimmory-tools","product":"grimmory","affected":["grimmory 3.3.0","grimmory 3.3.1","grimmory 3.3.2","grimmory 3.3.3","grimmory 3.4.0","grimmory 3.4.1"],"published":"2026-09-19","updated":"2026-09-21","sourceUpdated":"2026-09-21T21:17:20.133","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-93955","references":[{"url":"https://github.com/grimmory-tools/grimmory/","label":"cna@vuldb.com"},{"url":"https://github.com/grimmory-tools/grimmory/issues/2431","label":"cna@vuldb.com"},{"url":"https://github.com/grimmory-tools/grimmory/issues/2431#issuecomment-5384402858","label":"cna@vuldb.com"},{"url":"https://vuldb.com/cve/CVE-2026-93955","label":"cna@vuldb.com"},{"url":"https://vuldb.com/submit/943921","label":"cna@vuldb.com"},{"url":"https://vuldb.com/vuln/407914","label":"cna@vuldb.com"},{"url":"https://vuldb.com/vuln/407914/cti","label":"cna@vuldb.com"},{"url":"https://github.com/grimmory-tools/grimmory/issues/2431#issuecomment-5384402858","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"epss":0.00396,"epssPercentile":0.3365,"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-21T20:12:51.031460Z"},"ingestedAt":"2026-09-19T23:10:34.249Z","slug":"CVE-2026-93955","body":"## Overview\n\nA 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":36,"depthScoreParts":{"impact":23.7,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":208791,"id":"CVE-2026-93955","ts":1790024022798,"field":"exploit_available","old":"false","new":"true"}]}