{"id":"CVE-2026-85295","title":"Chartbrew: Full account takeover via JWTs accepted under default CB_SECRET","summary":"Chartbrew is an open-source web application that can connect directly to databases and APIs and use the data to create charts. Prior to 5.2.3, four authentication helpers accepted session tokens signed with CB_SECRET, including known, we…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","cwe":["CWE-1394"],"vendor":"chartbrew","product":"chartbrew","affected":["chartbrew < 5.2.3"],"published":"2026-11-06","updated":"2026-11-06","sourceUpdated":"2026-11-06T21:05:31.286Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-85295","references":[{"url":"https://github.com/chartbrew/chartbrew/security/advisories/GHSA-qvv4-r3q6-8797","label":"https://github.com/chartbrew/chartbrew/security/advisories/GHSA-qvv4-r3q6-8797"},{"url":"https://github.com/chartbrew/chartbrew/commit/da8c71f156aaa13fbc7ead15a4726740fef2b3c5","label":"https://github.com/chartbrew/chartbrew/commit/da8c71f156aaa13fbc7ead15a4726740fef2b3c5"},{"url":"https://github.com/chartbrew/chartbrew/releases/tag/v5.2.3","label":"https://github.com/chartbrew/chartbrew/releases/tag/v5.2.3"}],"tags":["cve.org"],"ingestedAt":"2026-11-06T22:04:56.332Z","epss":0.00397,"epssPercentile":0.34197,"slug":"CVE-2026-85295","body":"## Overview\n\nChartbrew is an open-source web application that can connect directly to databases and APIs and use the data to create charts. Prior to 5.2.3, four authentication helpers accepted session tokens signed with CB_SECRET, including known, weak, or shipped-default values. The vulnerable surface is session JWT fallback in server/modules/verifyToken.js, verifyUser.js, getUserFromToken.js, and socketManager.js across the API and socket layer. A stock source or repository Docker Compose deployment retains a known, weak, or default CB_SECRET and an attacker submits a forged HS256 token decoding to a target user id. Knowing the symmetric secret lets the attacker create a token that the legacy verification fallback accepts as the target user without that user's password or two-factor authentication. The condition includes stock source and repository Docker Compose installs and any otherwise known or weak CB_SECRET; a bare container where CB_SECRET is undefined is not affected by this fallback path. A forged session impersonates the chosen user across the entire API and socket layer and exercises that user's Chartbrew privileges. This issue is fixed in version 5.2.3.\n\n## Affected\n\n- `chartbrew < 5.2.3`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}