How severe is CVE-2025-53690?

CVE-2025-53690 has a CVSS 3.1 base score of 9 (CRITICAL). EPSS estimates a 51.1% probability of exploitation in the next 30 days. It is listed in the CISA Known Exploited Vulnerabilities catalog.

CVE-2025-53690: Sitecore Products ViewState Deserialization

CISA Known Exploited Vulnerabilities

Sitecore Multiple Products Deserialization of Untrusted Data Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.

Added to KEV

2025-09-04

Remediation due

2025-09-25

Required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

CISA notes
https://support.sitecore.com/kb?id=kb_article_view&sysparm_article=KB1003865 ; https://nvd.nist.gov/vuln/detail/CVE-2025-53690

Description

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.

Severity

CVSS 3.1 · CNA9 CRITICAL

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

SSVC · CISA-ADP

Exploitationactive

Automatableno

Technical impacttotal

Affected Products

Vendor	Product	Affected versions
Sitecore	Experience Manager (XM)	0 to 9.0
Sitecore	Experience Platform (XP)	0 to 9.0

References

2 Links

Other references

Record Details

Published

2025-09-03

Last updated

2026-02-26

Assigner (CNA)

Wiz

Credited to

Mandiant Threat Defense

Related Tool Categories

Tool categories that test for or protect against this vulnerability class.

CWE-502 · Deserialization of Untrusted Data

Application Security Tools Penetration Testing Tools

CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.