CVE-2025-53690 — Sitecore Multiple Products Deserialization of Untrusted Data Vulnerability

Deserialization of Untrusted Data vulnerability in Sitecore Experience Manager (XM), Sitecore Experience Platform (XP) allows Code Injection.This issue affects Experience Manager (XM): through 9.0; Experience Platform (XP): through 9.0.

01What is this vulnerability?

Deserialization of Untrusted Data vulnerability in Sitecore Experience Manager (XM), Sitecore Experience Platform (XP) allows Code Injection.This issue affects Experience Manager (XM): through 9.0; Experience Platform (XP): through 9.0.

02Affected products

Vendor	Product	Versions
Sitecore	Experience Manager (XM)	0
Sitecore	Experience Platform (XP)	0

03Active exploitation status

Yes — actively exploited. Added to the CISA KEV catalog on 2025-09-04. Ransomware use: Unknown.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

Open in Sigma generator →

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2025-09-03T20:04:48.223Z
• Last modified: 2026-02-26T17:49:44.363Z
• Added to CISA KEV: 2025-09-04
• BOD 22-01 due: 2025-09-25

09References

• cloud.google.com — https://cloud.google.com/blog/topics/threat-intelligence/viewstate-deserializati…
• support.sitecore.com — https://support.sitecore.com/kb?id=kb_article_view&sysparm_article=KB1003865