---
title: "Security digest: June 29, 2026"
url: https://erroneo.us/security/2026-06-29/
description: "June 29, 2026 vulnerability digest: 1 CISA KEV addition (SimpleHelp); 1 critical advisory (Go). What to patch and who can relax."
type: security-digest-day
section: "Security Digest"
date_published: 2026-06-29
date_modified: 2026-06-29
publisher: erroneo.us
author: erroneo.us Security Desk
license: All rights reserved. Quote with attribution and a link.
---

# Security digest: June 29, 2026

1 known exploited (cisa kev) addition and 1 critical advisory.

## Take stock

- Do you run any of these? SimpleHelp SimpleHelp. They are being exploited in the wild (CISA KEV). Patch or mitigate if you do; CISA’s federal deadline is 2026-07-02.
- Go: 1 critical advisory ( github.com/googleapis/mcp-toolbox ). Check with govulncheck ./... .
- None of it touches your stack? Then there is nothing to do today. That is a result, not a failure to read carefully.

## Known exploited (CISA KEV)

- [CVE-2026-48558](https://erroneo.us/security/cve/CVE-2026-48558/index.md) SimpleHelp  SimpleHelp: SimpleHelp Authentication Bypass Vulnerability (CISA due 2026-07-02)

## Critical advisories

- [CVE-2026-11720](https://erroneo.us/security/cve/CVE-2026-11720/index.md) MCP Toolbox HTTP tool path parameters allow traversal to unintended endpoints — Go github.com/googleapis/mcp-toolbox < 1.3.0 → 1.3.0

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Source page: https://erroneo.us/security/2026-06-29/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt