---
title: "Security digest: May 15, 2026"
url: https://erroneo.us/security/2026-05-15/
description: "May 15, 2026 vulnerability digest: 1 CISA KEV addition (Microsoft). What to patch and who can relax."
type: security-digest-day
section: "Security Digest"
date_published: 2026-05-15
date_modified: 2026-05-15
publisher: erroneo.us
author: erroneo.us Security Desk
license: All rights reserved. Quote with attribution and a link.
---

# Security digest: May 15, 2026

1 known exploited (cisa kev) addition.

## Take stock

- Do you run any of these? Microsoft Microsoft. They are being exploited in the wild (CISA KEV). Patch or mitigate if you do; CISA’s federal deadline is 2026-05-29.
- 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-2026-42897](https://erroneo.us/security/cve/CVE-2026-42897/index.md) Microsoft Microsoft: Microsoft Exchange Server Cross-Site Scripting Vulnerability (CISA due 2026-05-29)

## Critical advisories

None.

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Source page: https://erroneo.us/security/2026-05-15/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt