CVE-2025-2746: Kentico Xperience CMS 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

An authentication bypass vulnerability in Kentico Xperience allows authentication bypass via the Staging Sync Server password handling of empty SHA1 usernames in digest authentication. Authentication bypass allows an attacker to control administrative objects.This issue affects Xperience through 13.0.172.

Description quoted from the CVE record (assigned by VulnCheck, published 2025-03-24).

Weakness: CWE-288 Authentication Bypass Using an Alternate Path or Channel

How it can be exploited

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

CISA assessment (SSVC): CISA assesses exploitation as active. Automatable: yes. Technical impact: total.

On CISA KEV since: 2025-10-20
US federal deadline: 2025-11-10
Ransomware use: Not known

Public exploit evidence (Exploit Observer)

Also known as: CNNVD-202503-2804, CNVD-2026-05134, EUVD-2025-8008, GHSA-h4vh-mhxh-6rrr, SNYK-DOTNET-KENTICOXPERIENCELIBRARIES-9689933

VEDAS cluster: VEDAS:BEATBEETLE

Exploit Observer links 6 pieces of public exploit code or detection modules that name this CVE or one of its aliases.

Exploit code and modules (6)

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

Vulnerability databases and vendor advisories (8)

Catalogue entries, not exploit evidence.

Vulnerability database or vendor advisory: https://access.redhat.com/security/cve/cve-2025-2746
Vulnerability database or vendor advisory: https://euvd.enisa.europa.eu/enisa/EUVD-2025-8008
Vulnerability database or vendor advisory: https://github.com/advisories/GHSA-h4vh-mhxh-6rrr
Vulnerability database or vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2025-2746
Vulnerability database or vendor advisory: https://security.snyk.io/vuln/SNYK-DOTNET-KENTICOXPERIENCELIBRARIES-9689933
Vulnerability database or vendor advisory: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-2746
Vulnerability database or vendor advisory: https://www.cnnvd.org.cn/home/globalSearch?keyword=CNNVD-202503-2804
Vulnerability database or vendor advisory: https://www.cnvd.org.cn/flaw/show/CNVD-2026-05134

35 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: 0.741
very likely to be attacked soon
VEDAS: 0.991
strong exploit evidence
On CISA KEV: Yes, since 2025-10-20
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. The vertical line is the day CISA added it to its exploited list.

Who is affected

Product	Affected	Not affected
Kentico Xperience	up to and including 13.0.172	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: kentico xperience.

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:

https://devnet.kentico.com/download/hotfixes (vendor-advisory, patch)

How to detect it

Nuclei template (active check)

Kentico - Authentication Bypass
An authentication bypass vulnerability in Kentico Xperience allows authentication bypass via the Staging Sync Server password handling of empty SHA1 usernames in digest authentication. Authentication bypass allows an attacker to control administrative objects.This issue affects Xperience through 13.0.172.

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

The template sends 1 request (POST /CMSPages/Staging/SyncServer.asmx); it decides using 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-2025-2746.yaml

Show the template (75 lines)

yaml

id: CVE-2025-2746

info:
  name: "Kentico - Authentication Bypass"
  author: vedas-arpsyndicate
  severity: critical
  description: |
    An authentication bypass vulnerability in Kentico Xperience allows authentication bypass via the Staging Sync
    Server password handling of empty SHA1 usernames in digest authentication. Authentication bypass allows an
    attacker to control administrative objects.This issue affects Xperience through 13.0.172.
  reference:
    - https://www.exploit.observer/?keyword=CVE-2025-2746&match=exact
    - https://subdomain.center/?engine=ammonites&keyword=kentico&match=exact
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2025-2746
    cwe-id: CWE-287
  metadata:
    verified: false
  tags: cve,cve2025,kentico,stag,auth-bypass,xperience13,vuln,kev,vkev
variables:
  rand: "{{to_lower(rand_text_alpha(32))}}"

http:
  - raw:
      - |
        POST /CMSPages/Staging/SyncServer.asmx HTTP/1.1
        Host: {{Hostname}}
        Accept: */*
        Content-Type: text/xml; charset=utf-8
        SOAPAction: http://localhost/SyncWebService/SyncServer/ProcessSynchronizationTaskData

        <?xml version="1.0" encoding="utf-8"?>
            <soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
                <soap:Header>
                    <wsse:Security xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd" xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd">
                        <wsse:UsernameToken>
                            <wsse:Username>admin</wsse:Username>
                        </wsse:UsernameToken>
                    </wsse:Security>
                </soap:Header>
                <soap:Body>
                    <ProcessSynchronizationTaskData xmlns="http://localhost/SyncWebService/SyncServer">
                        <stagingTaskData><![CDATA[<{{rand}}>]]></stagingTaskData>
                    </ProcessSynchronizationTaskData>
                </soap:Body>
            </soap:Envelope>

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - "{{rand}}"
          - "<wsa:Action>"
        condition: and

      - type: word
        part: body
        words:
          - "Site not running"
          - "SyncServer.ErrorLicense"
          - "SyncServer.ErrorServiceNotEnabled"
          - "Staging service is not enabled on this server"
          - "Staging does not work with blank password"
          - "Missing X509 certificate token"
          - "The security token could not be authenticated or authorized"
        condition: or
        negative: true

      - type: word
        part: content_type
        words:
          - "text/xml"

CVE-2025-2746.yaml on GitHub

Suricata rules (network detection)

1 rule that alert on traffic matching this exploit: VEDAS CVE-2025-2746 Kentico - Authentication Bypass. 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-2025-2746 Kentico - Authentication Bypass"; flow:established,to_server; http.uri; content:"SyncServer.asmx"; nocase; http.request_body; content:"http://"; nocase; fast_pattern; classtype:web-application-attack; reference:cve,CVE-2025-2746; reference:url,https://www.exploit.observer/?keyword=CVE-2025-2746&match=exact; reference:url,https://subdomain.center/?engine=ammonites&keyword=kentico&match=exact; sid:1009123; rev:1;)

CVE-2025-2746.rules on GitHub

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.