# CVE-2025-53691: Sitecore Experience Remote Code Execution through Insecure Deserialization

- Exploited (CISA KEV): no
- Published: 2025-09-03
- CVSS: 8.8 HIGH (v3.1)
- EPSS: 1.6% (76th percentile)
- CWE: CWE-502

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 10.4; Experience Platform (XP): from 9.0 through 9.3, from 10.0 through 10.4.

## Edge WAF coverage (claimed by vendors, not measured)

| Vendor | Status | First rule | Days after publication |
|---|---|---|---|
| Cloudflare | Blocks by default | 2025-09-04 | 1 |
| AWS | No public claim | — | — |
| Microsoft Azure | No public claim | — | — |
| Google Cloud | No public claim | — | — |
| Fastly | Before feed history | — | — |
| F5 | Rule published | 2025-12-03 | 91 |
| Akamai | No public source | — | — |
| OWASP CRS | No public claim | — | — |

### Cloudflare

- 2025-09-04 · new · rule 588edc74df1f4609b3c2f7ef0ee2c15e · default Block
  > Sitecore - Remote Code Execution - CVE:CVE-2025-53691. Previous action: N/A. New action: Block. This is a new detection
  Source: https://developers.cloudflare.com/changelog/post/2025-09-04-emergency-waf-release/

### F5

- 2025-12-03 · new · rule 200204029
  > Added: signature 200204029 "Sitecore Unsafe Deserialization (2)" (Server Side Code Injection, risk High), systems: Microsoft Windows, IIS, ASP, ASP.NET. References: CVE-2025-53691.
  Source: https://docs.cloud.f5.com/docs-v2/platform/changelogs/security-details-changelog

"No public claim" means no vendor statement names this CVE; "Before feed history" means the CVE is older than the vendor feed. In both cases generic rules may still block it.

HTML: https://cve.vigilbase.com/cve/CVE-2025-53691 · JSON: https://cve.vigilbase.com/api/v1/cves/CVE-2025-53691