Sitecore Products ViewState Deserialization Vulnerability (CVE-2025-53690) | HOL Guard CVE

High severityKnown ExploitedCVE-2025-53690

Sitecore Products ViewState Deserialization Vulnerability

Answer in brief

CVE-2025-53690 records a High severity vulnerability in Sitecore Products ViewState Deserialization Vulnerability. The current sources mark it as known exploited. The current feed maps Sitecore/Experience Manager (XM) (generic), Sitecore/Experience Platform (XP) (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 3, 2025Updated Feb 26, 2026Source checked Sep 19, 2026First seen by HOL May 24, 2026Material review Feb 26, 2026

Upstream Advisory

Key facts

Risk: High
Exploitation: Known exploited
Affected software: 2 mapped packages or products
Fix availability: Not reported

Why this deserves its current priority

A CVSS score is not reported in the current record. Known-exploitation status makes exposure review time-sensitive. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Sitecore/Experience Manager (XM) (generic), Sitecore/Experience Platform (XP) (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Sitecore/Experience Manager (XM)generic	0	Not reported
Sitecore/Experience Platform (XP)generic	0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Sitecore/Experience Manager (XM), Sitecore/Experience Platform (XP).
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Sep 3, 2025
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Feb 26, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
May 24, 2026
Added to CISA KEV
Sep 4, 2025
Evidence: source:kev:kev:kev:record

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.