{"id":"CVE-2026-85708","title":"Chartbrew: Private chart data disclosure via forgeable CB_SECRET share tokens","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, Chart share and embed tokens were signed with CB_SECRET, including known or shipped-default va…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","cvssSource":"cna","cwe":["CWE-347"],"vendor":"chartbrew","product":"chartbrew","affected":["chartbrew < 5.2.3"],"published":"2026-11-06","updated":"2026-11-06","sourceUpdated":"2026-11-06T21:06:25.700Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-85708","references":[{"url":"https://github.com/chartbrew/chartbrew/security/advisories/GHSA-3chp-cr6f-hp63","label":"https://github.com/chartbrew/chartbrew/security/advisories/GHSA-3chp-cr6f-hp63"},{"url":"https://github.com/chartbrew/chartbrew/commit/07fff78db39e1c073a0301ac382c565268824e09","label":"https://github.com/chartbrew/chartbrew/commit/07fff78db39e1c073a0301ac382c565268824e09"},{"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":"2026-11-06T22:04:56.331Z","epss":0.00193,"epssPercentile":0.09081,"slug":"CVE-2026-85708","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, Chart share and embed tokens were signed with CB_SECRET, including known or shipped-default values in stock source and repository Docker Compose installs. The vulnerable surface is chart share-token verification and filter-access routes for private charts. An attacker who knows the deployment's CB_SECRET targets a private chart that has been shared at least once so a share-policy row exists, then forges a Chart-subject token for that chart id. The known signing key permits valid Chart tokens, and the filter-access path accepts sequential integer ids without requiring a legitimate share link; token expiry and revocation are ineffective once the secret is known. The condition requires a known or default secret and an existing share-policy row. A bare container where CB_SECRET is undefined is outside this path, and a unique secret excludes it only while the value remains unknown and unpredictable. An unauthenticated attacker can enumerate integer ids and read arbitrary private chart data, including chartData, without possessing a legitimate share link. 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":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}