# Sitecore Multiple Products: Multiple Products Deserialization of Untrusted Data Vulnerability · pwn.watch

> Sitecore Experience Manager (XM), Experience Platform (XP), Experience Commerce (XC), and Managed Cloud contain a deserialization of untrusted data vulnerability involving the use of default machine keys. This flaw allows attackers to exploit exposed ASP.NET machine keys to achieve remote code execution. Added to CISA KEV on 2025-09-04.

Page: https://pwn.watch/i/sitecore-multiple-products-cve-2025-53690 · generated 2026-10-22T20:45:43.249Z

## Status
- Severity: critical · status: closed · patch: patched
- Product: Sitecore Multiple Products
- Started: 2025-09-04 · closed: 2025-09-04
- CVEs: CVE-2025-53690
- Affected: See vendor advisory / CISA notes (versions not always listed in KEV feed)
- Fixed in: See vendor advisory linked in sources

## Follow this incident
- RSS (one item per update): https://pwn.watch/i/sitecore-multiple-products-cve-2025-53690/feed.xml
- JSON Feed: https://pwn.watch/i/sitecore-multiple-products-cve-2025-53690/feed.json
- Full data (timeline, sources, posts, agentBrief): https://pwn.watch/i/sitecore-multiple-products-cve-2025-53690.json
- This file: https://pwn.watch/i/sitecore-multiple-products-cve-2025-53690/llms.txt

## Updates (newest first)
- 2025-09-04: CISA added CVE-2025-53690 to the KEV catalog (due 2025-09-25).

## Fix brief
# Security brief: Sitecore Multiple Products: Multiple Products Deserialization of Untrusted Data Vulnerability

Source: https://pwn.watch/i/sitecore-multiple-products-cve-2025-53690 · status: closed (closed Sep 4, 2025) · severity: critical · updated Sep 4, 2025

## Patch status
**PATCHED: fixed releases exist. Upgrade to a fixed version.**

## What it is
Sitecore Experience Manager (XM), Experience Platform (XP), Experience Commerce (XC), and Managed Cloud contain a deserialization of untrusted data vulnerability involving the use of default machine keys. This flaw allows attackers to exploit exposed ASP.NET machine keys to achieve remote code execution. Added to CISA KEV on 2025-09-04.

Severity detail: CVSS 9.0 (CNA, v3.1); actively exploited (CISA KEV)

- Product: Sitecore Multiple Products
- CVE / advisory ids: CVE-2025-53690

## Affected versions
- See vendor advisory / CISA notes (versions not always listed in KEV feed)

## Check whether you're affected
No generic command applies (the product is a hosted service, appliance or desktop app). Check the installed version in its admin UI / About screen and compare with the versions above.

## Fix
Upgrade to one of these fixed versions (or later on the same branch):
- See vendor advisory linked in sources

After upgrading, re-run the checks above and redeploy/restart the affected services.

## Latest updates
- Sep 4, 2025: CISA added CVE-2025-53690 to the KEV catalog (due 2025-09-25).

## Advisories
- [Sitecore advisory: Sitecore Multiple Products](https://support.sitecore.com/kb?id=kb_article_view&sysparm_article=KB1003865) (Sitecore)
- [NVD: CVE-2025-53690](https://nvd.nist.gov/vuln/detail/CVE-2025-53690) (NVD)
- [CISA Known Exploited Vulnerabilities Catalog](https://www.cisa.gov/known-exploited-vulnerabilities-catalog) (CISA)

## Caveats
Derived from CISA KEV JSON feed catalogVersion 2026.10.21. CVSS from the CVE record (cvelistV5). Exact affected/fixed version strings are not always in the KEV record; verify against the vendor advisory URL. startedAt uses dateAdded (exploitation may have begun earlier; many entries are older CVEs newly confirmed as exploited in 2025).

---
Machine-readable: https://pwn.watch/i/sitecore-multiple-products-cve-2025-53690.json · all incidents: https://pwn.watch/incidents.json. Verify against the vendor advisory before changing production systems.