Security Digest · Vulnerability record · Known exploited
CVE-2025-53690: Sitecore Multiple Products Deserialization of Untrusted Data Vulnerability
Exploited in the wild (CISA KEV). 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.
CISA KEV · added 2025-09-04 CVSS 9.0 Critical EPSS 60.6% · p99
Should you act?
Exploited: patch now if you run it
CISA has confirmed exploitation in the wild. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- Yes, if you run Sitecore Multiple Products. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2025-09-04, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2025-09-25; treat that as the outer limit, not the target.
- EPSS 60.6%, percentile 99: FIRST’s model estimates a 60.6% chance of exploitation activity in the next 30 days, higher than 99% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
What it is
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.
CISA’s summary
Sitecore Experience Manager (XM), Experience Platform (XP), Experience Commerce (XC), and Managed Cloud contain a deserialization of untrusted data vulnerability involving the use of default machine keys. This flaw allows attackers to exploit exposed ASP.NET machine keys to achieve remote code execution.
Weakness type: CWE-502.
Product: Sitecore Multiple Products · Assigned by: Wiz · Published: 2025-09-03
Affected and fixed versions
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| Sitecore | Experience Manager (XM) | <= 9.0 |
| Sitecore | Experience Platform (XP) | <= 9.0 |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| Wiz | 3.1 | 9 Critical | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H |
- Attack vector: network (remotely reachable)
- Attack complexity: high (needs special conditions)
- Privileges required: none (no login)
- User interaction: none
- Scope: changed (can affect other components)
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- CISA KEV: added 2025-09-04; federal due date 2025-09-25. Known ransomware use: Unknown.
- CISA 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 SSVC assessment: exploitation active, automatable no, technical impact total.
- FIRST EPSS (model of 2026-10-21): 60.60% probability of exploitation activity in the next 30 days; percentile 99.
Timeline
- — CVE record published by Wiz
- — Added to CISA’s Known Exploited Vulnerabilities catalog
- — CISA remediation deadline for US federal agencies
- — CVE record last updated
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vendor and project advisories, patches
- Listed in CISA KEV notes (support.sitecore.com) support.sitecore.com
Vulnerability records
- CVE.org record CVE-2025-53690 cve.org
- NVD entry CVE-2025-53690 nvd.nist.gov
Government
Other references from the CVE record and advisory
- cloud.google.com cloud.google.com
All exploited Sitecore vulnerabilities · Today’s Security Digest