CVE-2025-53690: Sitecore exploited

Advisory generated from the CVE record, CISA, Exploit Observer and VEDAS: what it is, whether it is exploited, who is affected, and how to fix and detect it.

What it is

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.

Description quoted from the CVE record (assigned by Wiz, published 2025-09-03).

Weakness: CWE-502 Deserialization of Untrusted Data

How it can be exploited

Exploitable over the network with high attack complexity needing no privileges and no user interaction. Impact: confidentiality high, integrity high, availability high. CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

CISA assessment (SSVC): CISA assesses exploitation as active. Automatable: no. Technical impact: total.

On CISA KEV since: 2025-09-04
US federal deadline: 2025-09-25
Ransomware use: Not known

Public exploit evidence (Exploit Observer)

Also known as: BDU:2026-00819, CNNVD-202509-246, EUVD-2025-26629, GHSA-g5r9-cgwv-wmpc

VEDAS cluster: VEDAS:BARIUMBEETLE

Exploit Observer links 9 pieces of public exploit code or detection modules that name this CVE or one of its aliases.

Exploit code and modules (9)

Code that names this CVE. A repository can be a working exploit, a scanner, a fake or malware; read it before running anything.

Code repository: https://github.com/b1ack4sh/blackash-cve-2025-53690
Code repository: https://github.com/eriklearningsec/cve-2025-53690-poc
Code repository: https://github.com/eriklearningsec/cve-2025-53690-poc-nuclei-template
Code repository: https://github.com/m0d0ri205/cve-2025-53690-analysis
Code repository: https://raw.githubusercontent.com/ARPSyndicate/vedas-signatures/main/nuclei/2025/CVE-2025-53690.yaml
Code repository: https://raw.githubusercontent.com/ARPSyndicate/vedas-signatures/main/nuclei/2025/CVE-2025-53690.yaml
Code repository: https://raw.githubusercontent.com/ARPSyndicate/vedas-signatures/main/suricata/2025/CVE-2025-53690.rules
Code repository: https://raw.githubusercontent.com/ARPSyndicate/vedas-signatures/main/suricata/2025/CVE-2025-53690.rules
Code repository: https://raw.githubusercontent.com/ARPSyndicate/vedas-signatures/main/suricata/2025/CVE-2025-53690.rules

Research and write-ups (1)

Research or write-up: https://sempreupdate.com.br/vulnerabilidade-sitecore-cve-2025-53690

Vulnerability databases and vendor advisories (5)

Catalogue entries, not exploit evidence.

Vulnerability database or vendor advisory: https://euvd.enisa.europa.eu/enisa/EUVD-2025-26629
Vulnerability database or vendor advisory: https://github.com/advisories/GHSA-g5r9-cgwv-wmpc
Vulnerability database or vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2025-53690
Vulnerability database or vendor advisory: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-53690
Vulnerability database or vendor advisory: https://www.cnnvd.org.cn/home/globalSearch?keyword=CNNVD-202509-246

87 more references returned by Exploit Observer did not name this CVE or an alias, so they are left out.

VEDAS data as of 2026-11-01T17:12 UTC; fetched 2026-11-02.

Live scores

EPSS: 0.606
very likely to be attacked soon
VEDAS: 0.986
strong exploit evidence
On CISA KEV: Yes, since 2025-09-04
Detection rule: Nuclei · Suricata

EPSS (chance of attack)

VEDAS (exploit evidence)

Thin horizontal line: the “likely” (EPSS 0.10) or “strong” (VEDAS 0.90) threshold. Shaded “no data” areas are periods when cve-scores did not publish.

Who is affected

Product	Affected	Not affected
Sitecore Experience Manager (XM)	up to and including 9.0	Not stated
Sitecore Experience Platform (XP)	up to and including 9.0	Not stated

Version ranges exactly as the CVE record states them. “Before X” means X is the first fixed version.

Exploit Observer also maps it to: sitecore experience_commerce, sitecore experience_manager, sitecore experience_platform, sitecore managed_cloud, sitecore sitecore_experience_commerce, sitecore sitecore_experience_manager, sitecore sitecore_experience_platform, sitecore sitecore_managed_cloud.

How to fix it

CISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Vendor guidance:

How to detect it

Nuclei template (active check)

Sitecore Experience Manager - Insecure Deserialization
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.

Name and description quoted from the template, written by VEDAS.

The template sends 1 request (GET /sitecore/shell/sitecore.version.xml); it decides using dsl, regex, status, word matchers. Severity in the template: critical. Marked as not yet verified against a live vulnerable target.

Run it against a host you own or are authorised to test:

bash

nuclei -u https://your-host -t CVE-2025-53690.yaml

Show the template (60 lines)

yaml

id: CVE-2025-53690

info:
  name: "Sitecore Experience Manager - Insecure Deserialization"
  author: vedas-arpsyndicate
  severity: critical
  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.
  reference:
    - https://www.exploit.observer/?keyword=CVE-2025-53690&match=exact
    - https://subdomain.center/?engine=ammonites&keyword=sitecore&match=exact
  classification:
    cve-id: CVE-2025-53690
  metadata:
    verified: false
  tags: cve,cve2025,kev,sitecore,deserialization,rce,zero-day
http:
  - method: GET
    path:
      - "{{BaseURL}}/sitecore/shell/sitecore.version.xml"

    extractors:
      - type: regex
        name: major
        part: body
        group: 1
        regex:
          - '\b(\d)(\d)\d{6,}\b'
        internal: true

      - type: regex
        name: minor
        part: body
        group: 2
        regex:
          - '\b(\d)(\d)\d{6,}\b'
        internal: true

      - type: dsl
        name: version
        dsl:
          - major + "." + minor
        internal: false

    matchers-condition: and
    matchers:
      - type: status
        status:
          - 200

      - type: word
        words:
          - "Sitecore Corporation"
        part: body

      - type: dsl
        dsl:
          - compare_versions(version, "<= 9.0")

CVE-2025-53690.yaml on GitHub

Suricata rules (network detection)

1 rule that alert on traffic matching this exploit: VEDAS CVE-2025-53690 Sitecore Experience Manager - Insecure Deserialization. Add them to your Suricata rule set and reload.

Show the rules

suricata

alert http $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS (msg:"VEDAS CVE-2025-53690 Sitecore Experience Manager - Insecure Deserialization"; flow:established,to_server; http.uri; content:"/sitecore/shell/sitecore.version.xml"; nocase; fast_pattern; classtype:web-application-attack; reference:cve,CVE-2025-53690; reference:url,https://www.exploit.observer/?keyword=CVE-2025-53690&match=exact; reference:url,https://subdomain.center/?engine=ammonites&keyword=sitecore&match=exact; sid:1011792; rev:1;)

CVE-2025-53690.rules on GitHub

References

Government sources

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-53690 (government-resource)

Other references

Other databases

Where this comes from

This advisory is generated automatically by VEDAS from: CVE.org record, CISA KEV, cve-scores (EPSS and VEDAS), Exploit Observer, vedas-signatures. Text in quotes is reproduced from the source; everything else is a fixed template filled with source fields. Nothing here is written by a language model. Check the vendor advisory before acting, and read how VEDAS and Exploit Observer work, and their limits.