TI-2025-33607 Aliases CVE-2025-53690 GHSA-g5r9-cgwv-wmpc

Sitecore Products ViewState Deserialization Vulnerability

CRITICAL 98Exploited in the wildCWE-502Published 2025-09-03 · Updated 2026-02-26

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: High
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-502.

Summary

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.

Why it matters now

Exploitation Active In CISA KEV since 2025-09-04CISA due date 2025-09-25

EPSS 0.6071 99th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Active
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Sitecore	Experience Manager (XM)	up to 9.0	—	No fix listed	CNA
Sitecore	Experience Platform (XP)	up to 9.0	—	No fix listed	CNA

Experience Manager (XM) VendorSitecore Affected up to 9.0 Fixed in — No fix listed CNA
Experience Platform (XP) VendorSitecore Affected up to 9.0 Fixed in — No fix listed CNA

CPE configurations NVD · 4

CPE	Versions	Role	Vendor
cpe:2.3:a:sitecore:experience_commerce::::::::	up to 9.0	Vulnerable	Sitecore
cpe:2.3:a:sitecore:experience_manager::::::::	up to 9.0	Vulnerable	Sitecore
cpe:2.3:a:sitecore:experience_platform::::::::	up to 9.0	Vulnerable	Sitecore
cpe:2.3:a:sitecore:managed_cloud:-:::::::*	not specified by NVD	Vulnerable	Sitecore

cpe:2.3:a:sitecore:experience_commerce:*:*:*:*:*:*:*:* Versions up to 9.0 Vulnerable ·Sitecore
cpe:2.3:a:sitecore:experience_manager:*:*:*:*:*:*:*:* Versions up to 9.0 Vulnerable ·Sitecore
cpe:2.3:a:sitecore:experience_platform:*:*:*:*:*:*:*:* Versions up to 9.0 Vulnerable ·Sitecore
cpe:2.3:a:sitecore:managed_cloud:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Sitecore

Remediation

No fixed version listed by the sources yet.

Timeline

2025-09-04 Added to CISA KEV
2026-10-02 Threatist record created from CVE-2025-53690
2026-10-03 Alias added: GHSA-g5r9-cgwv-wmpc
2026-10-12 EPSS moved to the 99th percentile and above

References

Exploit 1

https://cloud.google.com/blog/topics/threat-intelligence/viewstate-deserialization-zero-day-vulnerability

Advisory 1

https://support.sitecore.com/kb?id=kb_article_view&sysparm_article=KB1003865

TI-2023-17897 Multiple Sitecore products allow remote code execution. CVSS 3.1CRITICAL 9.8
TI-2025-33610 HTML Cache Poisoning through Unsafe Reflections CVSS 3.1CRITICAL 9.8
TI-2025-24533 Sitecore XM and XP Hardcoded Credentials CVSS 3.1HIGH 7.5
TI-2025-33608 Sitecore Experience Remote Code Execution through Insecure Deserialization CVSS 3.1HIGH 8.8
TI-2025-24535 Sitecore PowerShell Extension RCE via Unrestricted Upload CVSS 3.1HIGH 8.8
TI-2025-24534 Sitecore XM, XC, and XP Post-Auth RCE via Zip Slip CVSS 3.1HIGH 8.8

See all 9 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences