Threats / Sitecore / CVE-2025-53690
CVE-2025-53690
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
Sitecore Multiple Products vulnerability
Sitecore Experience Manager, Platform, Commerce, and Managed Cloud contain a deserialization vulnerability in default machine keys enabling remote code execution.
Verdict
Today item — known-exploited.
Attackers exploiting exposed ASP.NET machine keys can deserialize untrusted data to achieve remote code execution on affected Sitecore instances. Active exploitation in the wild increases risk for unpatched deployments.
01
Is it exploitable?
— the evidence, ranked above the scoreExploit available
Fully weaponized — public exploit code is cataloged for this vulnerability.We link the existence of the exploit; we do not host or redistribute payloads.
Reported exploitation
12 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-09-04).
Probability (EPSS)
EPSS 0.26308 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
Affected: Sitecore, Multiple Products. Confirm exact fixed builds in the vendor advisory.
Weakness (CWE)
Mapped to CWE-502 Deserialization of Untrusted Data — weakness family: Injection.CWE assignment from the public NVD record; the weakness class drives how the flaw is exploited.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I identify or obtain the default ASP.NET machine key from a Sitecore instance.
Business
Exposure of machine keys represents a fundamental authentication bypass, compromising the integrity of cryptographic protections.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I craft a malicious serialized object using the known machine key and send it to the application.
Business
Attackers gain the ability to inject arbitrary code into the deserialization process without detection by standard input validation.
3
Lateral reach — past segmentation narrative 3
Attacker
I execute arbitrary code on the server during deserialization of my crafted payload.
Business
Complete server compromise enables data theft, lateral movement, and persistent access to critical business systems and customer data.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05
Coverage & confidence
— what we know, and what we don’tEstablished (cited)
Coverage gaps — stated, not hidden
Disclosure & credit2
Catalogued by WizCNA
Credited with finding itMandiant Threat Defensefinder