# CVE-2026-120548: YML for Yandex Market <= 5.10.0 - Unauthenticated Sensitive Information Exposure through Log File via 'y4ym_check_action' Parameter via admin-post.php

Status: published. Published: 2026-11-07. Updated: 2026-11-07.

The YML for Yandex Market plugin for WordPress is vulnerable to Sensitive Information Exposure in all versions up to, and including, 5.10.0 via the 'y4ym_check_action' parameter. This makes it possible for unauthenticated attackers to extract the merchant's plaintext Yandex Market API key written to the publicly accessible log file at wp-content/uploads/y4ym/yml-for-yandex-market.log, granting full control over the merchant's marketplace catalogue, prices, and stock. Exploitation requires that the targeted feed has a stored Yandex Market API key and that the y4ym_keeplogs option is enabled — both conditions that represent normal, documented plugin usage actively encouraged by the plugin's own support and feedback workflow.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- icopydoc / YML for Yandex Market: ≥ 0; ≤ 5.10.0 (affected, semver). Source: CNA: Wordfence

## Severity and prioritization

- CVSS 3.1: 5.3 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N; source: CNA: Wordfence

- CVSS 3.1: 5.3 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N; source: NVD: security@wordfence.com

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-532

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/33a2cf5c-d71f-45cf-8f8a-0edd47bc1974?source=cve (CNA: Wordfence)

- https://plugins.trac.wordpress.org/browser/yml-for-yandex-market/tags/5.10.0/admin/class-y4ym-admin.php#L467 (CNA: Wordfence)

- https://plugins.trac.wordpress.org/browser/yml-for-yandex-market/tags/5.10.0/includes/feeds/import/class-y4ym-api.php#L580 (CNA: Wordfence)

- https://plugins.trac.wordpress.org/browser/yml-for-yandex-market/tags/5.10.0/includes/core/class-y4ym-error-log.php#L136 (CNA: Wordfence)

- https://plugins.trac.wordpress.org/changeset?reponame=&old=3774592%40yml-for-yandex-market&new=3774592%40yml-for-yandex-market (CNA: Wordfence)

- https://plugins.trac.wordpress.org/browser/yml-for-yandex-market/tags/5.10.0/admin/class-y4ym-admin.php#L467 (security@wordfence.com)

- https://plugins.trac.wordpress.org/browser/yml-for-yandex-market/tags/5.10.0/includes/core/class-y4ym-error-log.php#L136 (security@wordfence.com)

- https://plugins.trac.wordpress.org/browser/yml-for-yandex-market/tags/5.10.0/includes/feeds/import/class-y4ym-api.php#L580 (security@wordfence.com)

- https://plugins.trac.wordpress.org/changeset?reponame=&old=3774592%40yml-for-yandex-market&new=3774592%40yml-for-yandex-market (security@wordfence.com)

- https://www.wordfence.com/threat-intel/vulnerabilities/id/33a2cf5c-d71f-45cf-8f8a-0edd47bc1974?source=cve (security@wordfence.com)

## Provenance

- CNA: Wordfence: https://www.cve.org/CVERecord?id=CVE-2026-120548; retrieved 2026-11-07; source updated 2026-11-07

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-120548; retrieved 2026-11-07; source updated 2026-11-07

Revision: 04773dc8ab8d7949bdc1742a2d388e38ed4b44e690e41d10f020ae9a0a3327ad

Canonical: https://y2.dev/cve/CVE-2026-120548

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.