---
title: "Security digest: May 9, 2023"
url: https://erroneo.us/security/2023-05-09/
description: "May 9, 2023 vulnerability digest: 1 brief (SharePoint CVE-2023-24955 + 29357: Pwn2Own Chain…). What to patch and who can relax."
type: security-digest-day
section: "Security Digest"
date_published: 2023-05-09
date_modified: 2026-10-23
publisher: erroneo.us
author: erroneo.us Security Desk
license: All rights reserved. Quote with attribution and a link.
---

# Security digest: May 9, 2023

1 editorial brief.

## Take stock

- Check exposure: SharePoint CVE-2023-24955 + 29357: Pwn2Own Chain Exploited . Owners of on-premises SharePoint Server 2016, 2019 or Subscription Edition farms that are internet-facing and not on current cumulative updates, or that missed the May and June 2023 updates for any period.
- None of it touches your stack? Then there is nothing to do today. That is a result, not a failure to read carefully.

## Editorial briefs

- **Check exposure** [SharePoint CVE-2023-24955 + 29357: Pwn2Own Chain Exploited](https://erroneo.us/security/briefs/sharepoint-cve-2023-24955-29357-pwn2own-chain/index.md): Patched in May and June 2023 and long superseded; the real question is whether any on-prem farm still runs a pre-2023 build or was exposed and unpatched in early 2024, when exploitation was confirmed.

## Known exploited (CISA KEV)

None.

## Critical advisories

None.

---
Source page: https://erroneo.us/security/2023-05-09/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt