What is CVE-2025-53690?
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.
The record classifies CVE-2025-53690 under weakness class CWE-502. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 2 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 424 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 9 — CRITICAL
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H - EPSS (FIRST)
- 51.0% probability of exploitation in the next 30 days, higher than 98.9% of all scored CVEs
- CISA KEV
- Listed since 2025-09-04, federal remediation deadline 2025-09-25
- Threadlinqs priority
- 9/10 — CISA KEV-listed, which Threadlinqs floors at 9
- Published
- 2025-09-03, last modified 2026-02-26
Is CVE-2025-53690 being exploited?
CISA added CVE-2025-53690 to the Known Exploited Vulnerabilities catalog on 2025-09-04, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2025-09-25 under BOD 22-01. Weaponised exploit code for CVE-2025-53690 is publicly available. 4 public proof-of-concept repositories are tracked for this identifier. It currently carries a trending score of 53 in the Threadlinqs vulnerability feed.
- ErikLearningSec/CVE-2025-53690-POC (github)
- rxerium/CVE-2025-53690 (github)
- m0d0ri205/CVE-2025-53690-Analysis (github)
- trickest/cve (trickest)
Affected products and versions
- Sitecore: Experience Manager (XM), Experience Platform (XP)
How to fix CVE-2025-53690
Vendor advisory: https://support.sitecore.com/kb?id=kb_article_view&sysparm_article=KB1003865. Because CVE-2025-53690 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2025-09-25. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.
Threat activity tracking CVE-2025-53690
2 tracked threats in the Threadlinqs corpus reference CVE-2025-53690, either in the campaign’s CVE list or as an indicator on the campaign record.
- APT and Financial Attacks on Industrial Organizations in Q1 2026 (Kaspersky ICS CERT): Operation Neusploit (CVE-2026-21509/CVE-2026-21513), Poland Energy Wipers, TGR-STA-1030, MuddyWater, LockBit 5.0, Diesel Vortex — HIGH · 2026-10-31
- KnowledgeDeliver LMS ViewState Deserialization Zero-Day CVE-2026-5426 — Unauthenticated RCE via Shared ASP.NET machineKey + BLUEBEAM (Godzilla) Web Shell and Cobalt Strike BEACON Watering Hole — CRITICAL · 2026-05-25
Sources
Enriched from CVE.org, NVD, FIRST EPSS, CISA KEV, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.