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Findings

CVE-2026-35569

ApostropheCMS is an open-source Node.js content management system.

Published Apr 15, 2026 · updated Jun 17, 2026 · apostrophecms apostrophecms

ApostropheCMS is an open-source Node.js content management system. Versions 4.28.0 and prior contain a stored cross-site scripting vulnerability in SEO-related fields (SEO Title and Meta Description), where user-controlled input is rendered without proper output encoding into HTML contexts including tags, attributes, and JSON-LD structured data. An attacker can inject a payload such as "> alert(1) to break out of the intended HTML context and execute arbitrary JavaScript in the browser of any authenticated user who views the affected page. This can be leveraged to perform authenticated API requests, access sensitive data such as usernames, email addresses, and roles via internal APIs, and exfiltrate it to an attacker-controlled server. This issue has been fixed in version 4.29.0.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 15, 2026 · NIST NVD

    Detected

    ApostropheCMS is an open-source Node.js content management system. Versions 4.28.0 and prior contain a stored cross-site scripting vulnerability in SEO-related fields (SEO Title and Meta Description), where user-controlled input is rendered without proper output encoding into HTML contexts including tags, attributes, and JSON-LD structured data. An attacker can inject a payload such as "> alert(1)

  2. Jun 17, 2026 · NIST NVD

    Updated

    ApostropheCMS is an open-source Node.js content management system. Versions 4.28.0 and prior contain a stored cross-site scripting vulnerability in SEO-related fields (SEO Title and Meta Description), where user-controlled input is rendered without proper output encoding into HTML contexts including tags, attributes, and JSON-LD structured data. An attacker can inject a payload such as "> alert(1)

Affected

  • cpe apostrophecms/apostrophecmsversion unspecified

Sources

  • CVE.orgVulnerability recordCVE-2026-35569

    Official CVE identifier

    cve.org
  • NIST NVDVulnerability recordCVE-2026-35569

    ApostropheCMS is an open-source Node.js content management system. Versions 4.28.0 and prior contain a stored cross-site scripting vulnerability in SEO-related fields (SEO Title and Meta Description), where user-controlled input is rendered without proper output encoding into HTM

    nvd.nist.gov

References