Cve-2026-35569 - CraftedSignal Threat Feedhttps://feed.craftedsignal.io/tags/cve-2026-35569/Trending threats, MITRE ATT&CK coverage, and detection metadata. Fed continuously.Hugoenhello@craftedsignal.iohello@craftedsignal.ioTue, 09 Jan 2024 18:00:00 +0000ApostropheCMS Stored XSS Vulnerability in SEO Fields (CVE-2026-35569)https://feed.craftedsignal.io/briefs/2024-01-apostrophe-cms-xss/Tue, 09 Jan 2024 18:00:00 +0000hello@craftedsignal.iohttps://feed.craftedsignal.io/briefs/2024-01-apostrophe-cms-xss/A stored XSS vulnerability in ApostropheCMS versions 4.28.0 and prior allows attackers to inject arbitrary JavaScript into SEO-related fields, leading to potential data exfiltration and unauthorized actions.ApostropheCMS, a Node.js content management system, is vulnerable to a stored cross-site scripting (XSS) attack. This vulnerability, identified as CVE-2026-35569, affects versions 4.28.0 and earlier. The flaw resides in SEO-related fields, specifically the SEO Title and Meta Description, where user-controlled input is rendered without proper output encoding. An attacker can inject malicious JavaScript code that executes in the browser of any authenticated user viewing the affected page. The vulnerability has been patched in version 4.29.0. Exploitation of this vulnerability can lead to account takeover, sensitive information disclosure, and further malicious activities.

Attack Chain

  1. An attacker authenticates to the ApostropheCMS instance with sufficient privileges to modify SEO-related fields.
  2. The attacker crafts a malicious payload, such as "></title><script>alert(1)</script>", designed to break out of the intended HTML context.
  3. The attacker injects the malicious payload into the SEO Title or Meta Description field of a page or content item.
  4. The attacker saves the changes to the page or content item, storing the XSS payload in the database.
  5. An authenticated user views the page or content item with the injected XSS payload.
  6. The malicious JavaScript code executes within the user's browser, allowing the attacker to perform actions on behalf of the user.
  7. The attacker can leverage the XSS to make authenticated API requests to access sensitive data like usernames, email addresses, and roles.
  8. The attacker exfiltrates the stolen data to an attacker-controlled server for further malicious use.

Impact

Successful exploitation of the stored XSS vulnerability in ApostropheCMS (CVE-2026-35569) can have significant consequences. Attackers can potentially compromise user accounts, steal sensitive data, and perform unauthorized actions within the CMS. The impact depends on the privileges of the compromised user, but could range from defacing content to gaining full administrative control. The vulnerability affects any ApostropheCMS instance running version 4.28.0 or earlier, potentially impacting organizations across various sectors that rely on this CMS for their web content management needs.

Recommendation

  • Upgrade ApostropheCMS to version 4.29.0 or later to patch the vulnerability (CVE-2026-35569).
  • Implement input validation and output encoding on all user-supplied data, especially in SEO-related fields, to prevent XSS attacks.
  • Deploy the Sigma rule "Detect ApostropheCMS XSS Payload in HTTP URI" to identify attempts to exploit the vulnerability by monitoring web server logs for suspicious patterns.
  • Review and audit existing content for potentially malicious code injected into SEO Title and Meta Description fields.
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