What is CVE-2025-53691?

CVE-2025-53691 is a high-severity vulnerability in Sitecore Experience Manager (Xm), classified under Deserialization of Untrusted Data. CVSS score: 8.8/10. Published 2025-09-03.

How severe is CVE-2025-53691?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2025-53691 known to be exploited?

8 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Deserialization in Sitecore Experience Manager (Xm)

CVE-2025-53691

Deserialization of Untrusted Data vulnerability in Sitecore Experience Manager (XM), Sitecore Experience Platform (XP) allows Remote Code Execution (RCE).This issue affects Experience Manager (XM): from 9.0 through 9.3, from 10.0 through 1…

Vulnerability class: Insecure Deserialization

EPSS: 0.050 (89.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Sitecore Experience Manager (Xm) — versions 9.0, 10.0
Sitecore Experience Platform (Xp) — versions 9.0, 10.0

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2025-53691?: CVE-2025-53691 is a high-severity vulnerability in Sitecore Experience Manager (Xm), classified under Deserialization of Untrusted Data. CVSS score: 8.8/10. Published 2025-09-03.
How severe is CVE-2025-53691?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2025-53691 known to be exploited?: 8 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.