Type Vulnerability
Sitecore Experience Manager (XM), Experience Platform (XP), Experience Commerce (XC), and Managed Cloud contain a deserialisation of untrusted data vulnerability involving the use of default machine…
Apple · Parser conflict
Sitecore Multiple Products Unsafe Deserialisation Vulnerability
CVE-2025-53690
What this means
This is rated critical severity (9 out of 10). It is on the known-exploited catalogue, which means attacks using it have already been seen. Ask IT whether Sitecore Experience Commerce, Sitecore Experience Manager and Sitecore Experience Platform, and 1 more are in your estate, and treat that as the priority.
Full vendor 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.
Scoring and exploitation
9.0/ 10
CVSS 3.1 base scoreCritical
Exploitable over the network without any account, under specific conditions, and no one has to click or open anything. High impact on confidentiality, integrity and availability, and it can reach beyond the vulnerable system.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Exploitability
Longer bar: easier to attack
Attack vectorNetworkAV:N
Attack complexityHighAC:H
Privileges requiredNonePR:N
User interactionNoneUI:N
ScopeChangedS:C
Impact
Longer bar: more harm
ConfidentialityHighC:H
IntegrityHighI:H
AvailabilityHighA:H
- Elevated attack likelihood (~60.6% in 30 days)Model estimate (): a probability signal, not confirmed exploitation
- Exploited in the wild
- Yes — confirmed exploitation (US CISA )
- Not reported
- Listed product
- Sitecore Multiple Products
Weaknesses
CWE-502
Affected products ()
- Sitecore Experience Commerce
- Sitecore Experience Manager
- Sitecore Experience Platform
- Sitecore Managed Cloud
Show the raw CPE strings (4)
- cpe:2.3:a:sitecore:experience_commerce:*:*:*:*:*:*:*:*
- cpe:2.3:a:sitecore:experience_manager:*:*:*:*:*:*:*:*
- cpe:2.3:a:sitecore:experience_platform:*:*:*:*:*:*:*:*
- cpe:2.3:a:sitecore:managed_cloud:-:*:*:*:*:*:*:*
References
3 links from the CVE record, grouped by site; the vendor's advisory comes first.
support.sitecore.com1 linkVendor advisory
- kb (opens in a new tab)Vendor Advisory
cloud.google.com1 link
- viewstate-deserialization-zero-day-vulnerability (opens in a new tab)Exploit · Third Party Advisory
cisa.gov1 link
- known-exploited-vulnerabilities-catalog (opens in a new tab)US Government Resource