---
title: "Security digest: July 1, 2026"
url: https://erroneo.us/security/2026-07-01/
description: "July 1, 2026 vulnerability digest: 1 CISA KEV addition (Microsoft); 5 critical advisories (Go, npm, Hex (Erlang/Elixir)). What to patch and who can relax."
type: security-digest-day
section: "Security Digest"
date_published: 2026-07-01
date_modified: 2026-07-01
publisher: erroneo.us
author: erroneo.us Security Desk
license: All rights reserved. Quote with attribution and a link.
---

# Security digest: July 1, 2026

1 known exploited (cisa kev) addition and 5 critical advisories.

## Take stock

- Do you run any of these? Microsoft SharePoint Server. They are being exploited in the wild (CISA KEV). Patch or mitigate if you do; CISA’s federal deadline is 2026-07-04.
- Go: 3 critical advisories ( github.com/rancher/fleet , github.com/rancher/rancher ). Check with govulncheck ./... .
- npm: 1 critical advisory ( ghost ). Check with npm audit (or: npm ls <package>) .
- Hex (Erlang/Elixir): 1 critical advisory ( quic ). Check with mix hex.audit .
- 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-2026-45659](https://erroneo.us/security/cve/CVE-2026-45659/index.md) Microsoft SharePoint Server: Microsoft SharePoint Server Deserialization of Untrusted Data Vulnerability (CISA due 2026-07-04)

## Critical advisories

- [CVE-2026-44935](https://erroneo.us/security/cve/CVE-2026-44935/index.md) Rancher Fleet vulnerable to cross namespace secret disclosure via unvalidated `valuesFrom` references in Helm Deployer — Go github.com/rancher/fleet >= 0.15.0, < 0.15.2 → 0.15.2; Go github.com/rancher/fleet >= 0.14.0, < 0.14.6 → 0.14.6; Go github.com/rancher/fleet >= 0.13.0, < 0.13.11 → 0.13.11
- [CVE-2026-41052](https://erroneo.us/security/cve/CVE-2026-41052/index.md) Rancher has Privilege Escalation from Project Owner to Host — Go github.com/rancher/rancher >= 2.14.0, < 2.14.2 → 2.14.2; Go github.com/rancher/rancher >= 2.13.0, < 2.13.6 → 2.13.6; Go github.com/rancher/rancher >= 2.12.0, < 2.12.10 → 2.12.10
- [CVE-2026-44939](https://erroneo.us/security/cve/CVE-2026-44939/index.md) Rancher vulnerable to command injection through unsanitized YAML parameter — Go github.com/rancher/rancher >= 2.14.0, < 2.14.2 → 2.14.2; Go github.com/rancher/rancher >= 2.13.0, < 2.13.6 → 2.13.6; Go github.com/rancher/rancher >= 2.12.0, < 2.12.10 → 2.12.10
- [CVE-2026-53943](https://erroneo.us/security/cve/CVE-2026-53943/index.md) Ghost: Cache-poisoning XSS in Ghost frontend via x-ghost-preview header — npm ghost >= 4.0.0, <= 6.36.0 → 6.37.0
- [CVE-2026-49457](https://erroneo.us/security/cve/CVE-2026-49457/index.md) QUIC has Broken TLS verification — Hex (Erlang/Elixir) quic <= 1.4.3 → 1.4.4

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Source page: https://erroneo.us/security/2026-07-01/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt