---
cve: "CVE-2026-77521"
severity: "CRITICAL"
cvss: 10.0
epss: "1.1%"
vendor: "1Panel-dev"
kev: false
exploited: false
published: "2026-09-21 21:17:10"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-11-09T21:29:22+01:00"
---

# CVE-2026-77521

> 10.0 CRITICAL · 🧪 PoC

## Beschreibung

MaxKB is an open-source AI assistant for enterprise. Prior to version 2.10.5-lts, assistants with a tool, MCP tool, skill, or sub-application use SandboxShellBackend, which exposes an execute shell tool without excluding it and omits execute from interrupt_on, so human approval is not required. Untrusted chat or ingested content can therefore cause command execution; source deployments with MAXKB_SANDBOX disabled run commands directly as the application user, while the official root container's string-based gosu wrapper allowed shell metacharacters to execute outside the intended sandbox. This issue is fixed in version 2.10.5-lts.

## CNA-Record (Kanon, cvelistV5)

- CNA: **GitHub_M**
- State: PUBLISHED
- Stand: 2026-09-22 13:32:19
- CNA-CVSS: **10.0** (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H`)

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **poc**
  - Automatable: **yes**
  - Technical Impact: **total**

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Verändert | bad |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Hoch | bad |

## Schwachstellen-Klasse

- **CWE-250** — Execution with Unnecessary Privileges
  The product performs an operation at a privilege level that is higher than the minimum level required, which creates new weaknesses or amplifies the consequences of other weaknesses.
- **CWE-749** — Exposed Dangerous Method or Function
  The product provides an Applications Programming Interface (API) or similar interface for interaction with external actors, but the interface includes a dangerous method or function that is not properly restricted.
- **CWE-78** — Improper Neutralization of Special Elements used in an OS Command (OS Command Injection)
  The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command before it is sent to a downstream component.

## Angriffsmuster (CAPEC)

- [CAPEC-69 — Target Programs with Elevated Privileges](https://capec.mitre.org/data/definitions/69.html) _(Severity: Very High)_
- [CAPEC-104 — Cross Zone Scripting](https://capec.mitre.org/data/definitions/104.html) _(Severity: High)_
- [CAPEC-470 — Expanding Control over the Operating System from the Database](https://capec.mitre.org/data/definitions/470.html) _(Severity: Very High)_

## Patch verfügbar (OSV)

- 01b21db88145278d98bf5e9bd55e6abd6b3aad43 (Commit)
- 594f50f2ea80a502d1c955371ba0438b277c30ea (Commit)

## Referenzen

- <https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-f36j-f34j-h3rx>
- <https://github.com/1Panel-dev/MaxKB/commit/594f50f2ea80a502d1c955371ba0438b277c30ea>
- <https://github.com/1Panel-dev/MaxKB/releases/tag/v2.10.5-lts>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-77521/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_