What is the CVSS score of CVE-2025-53690?

CVE-2025-53690 has a CVSS 3.1 base score of 9.0 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H. EPSS exploitation probability: 9.3%.

Is there a public PoC exploit available for CVE-2025-53690?

Yes, a public proof-of-concept exploit is available for CVE-2025-53690. Prioritise patching immediately. EPSS: 9.3%.

How to fix or mitigate CVE-2025-53690?

Within 24 hours: Identify all affected systems and apply vendor patches immediately. Restrict deserialization to trusted data sources and implement integrity checks.

Sitecore CVE-2025-53690

CRITICAL

Deserialization of Untrusted Data (CWE-502)

2025-09-03 9947ef80-c5d5-474a-bbab-97341a59000e

Deserialization Experience Commerce Experience Manager Experience Platform Managed Cloud Sitecore

9.0

CVSS 3.1 · Vendor: 9947ef80-c5d5-474a-bbab-97341a59000e

View

Vulnerability Assessment

Weakness	CWE CWE-502 OWASP Top 10:2025 A08:2025 - Software or Data Integrity Failures ASVS 5.0 V1 - Encoding and Sanitization Safe deserialization, type allowlists MITRE ATT&CK 2 techniques across 2 tactics: Execution, Initial Access The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	Critical risk (CVSS 9.0, EPSS 59.1%). Sitecore is used by major enterprises for web content management. Code execution provides access to all CMS content and connected systems.
Exploit ScenarioDerived	An attacker sends crafted serialized data to Sitecore, achieving code execution on the CMS server. This provides access to web content, user databases, and connected marketing platforms.

Emergency Immediate action required. Why: CRITICAL + in CISA KEV (actively exploited), no patch available.

Exploited in the wild (CISA KEV) No patch listed yet 9.3% exploitation probability (EPSS)

Get an e-mail when this CVE is exploited, patched or re-scored. Free account.

Alert me

AnalysisAIv1 – Mar 28, 2026

Sitecore Experience Manager/Platform through version 9.0 contains a deserialization vulnerability enabling code injection through untrusted data processing.

Earlier versions of this analysis (1)

v1 Mar 28, 2026 - 19:10 CVSS 9.0

A deserialization vulnerability in Sitecore XM/XP allows code injection through crafted serialized data, compromising the enterprise CMS platform.

RemediationAI

Apply Sitecore security patches. Implement .NET serialization filtering.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

The CWE-502 deserialization processes untrusted data that can contain malicious serialized .NET objects for code execution.

Know when Sitecore gets its next vulnerability

Watch products and get an email when something new is published
Check this CVE against your own stack and servers
Exploit and PoC references, threat intelligence from 22 sources

Continue with Google Continue with GitHub

No credit card · 7-day full trial

Severity by source

Vendor (9947ef80-c5d5-474a-bbab-97341a59000e) PRIMARY 9.0 CRITICAL

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

Primary rating from Vendor (9947ef80-c5d5-474a-bbab-97341a59000e) · only source for this CVE.

CVSS VectorVendor: 9947ef80-c5d5-474a-bbab-97341a59000e

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Added to CISA KEV

Oct 30, 2025 - 20:39 cisa

CISA KEV

PoC Detected

Oct 30, 2025 - 20:39 vuln.today

Public exploit code

CVE Published

Sep 03, 2025 - 20:15 nvd

CRITICAL 9.0

DescriptionCVE.org

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.

Executive ViewAI

Why It Matters

CVE-2025-53690 presents critical security risk, a insecure deserialization vulnerability rated CVSS 9.0. Insecure deserialization could allow attackers to execute arbitrary code by providing crafted serialized data. This vulnerability is actively exploited in the wild (KEV-listed) and requires immediate remediation. Immediate patching is required per CISA KEV mandate.

Business Impact: Severe

Compensating Controls

Apply vendor patch. If immediate patching is not feasible: (1) Restrict deserialization endpoints; (2) Implement integrity checks on serialized data; (3) Use type-safe alternatives.

Threat Intelligence Overview

Threat Score

5.1/10

Composite threat intelligence

EPSS Score

9.3%

Top 7% exploitable

Exploit

POC

Public exploit code exists

Data Quality

4 sources

Confidence: Medium

NVD

CVE.org

CISA KEV

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity CRITICAL

CISA KEV Yes

Public POC Yes

EPSS 9.3%

Patch available No

Active threat Yes

Deciding rule

CRITICAL + in CISA KEV (actively exploited), no patch available

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Immediate

Exploitation· derived

Active

System Exposure· derived

Open

Automatable· derived

Human Impact

Very High

Priority Score

124

Low Medium High Critical

KEV: +50

EPSS: +9

CVSS: +45

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Insecure Deserialization CRITICAL

Insecure deserialization occurs when an application converts serialized data (a stream of bytes representing an object's state) back into a living object without proper validation.