Security Alert Summary
The WaveSurfer-WP plugin for WordPress contains a stored Cross-Site Scripting (XSS) vulnerability in its audio shortcode. Insufficient input sanitization and output escaping on the shortcode’s src attribute allows authenticated users with Contributor-level access and above to inject scripts that execute when an affected page is viewed.
CVE Details
- CVE ID: CVE-2026-1909
- Affected component: WaveSurfer-WP plugin for WordPress
- Affected versions: All versions up to and including 2.8.3
- Published: February 6, 2026 at 07:16:12 AM UTC
- Last modified: February 6, 2026 at 03:14:47 PM UTC
- CVSS v3.1 base score: 6.4
- CVSS v3.1 severity: MEDIUM
- CVSS vector string:
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N - Authentication / privileges / user interaction: Requires an authenticated user with low privileges (Contributor-level access and above). No user interaction is required to trigger the vulnerability once content is injected.
- Primary impact: Confidentiality: LOW; Integrity: LOW; Availability: NONE
- CWE / weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)
Technical Details
The plugin’s audio shortcode fails to sufficiently sanitize input and escape output for the src attribute. This allows stored Cross-Site Scripting (XSS) where an attacker with Contributor-level access or higher can place a crafted shortcode or content containing a malicious payload. The malicious script is stored in the site content and executes in the browser of any user who views the affected page, because the attribute value is not properly neutralized before being rendered.
The description identifies the src attribute of the audio shortcode as the injection point. The vulnerability exists due to missing or inadequate input sanitization and output escaping for values that are rendered into page markup. Impact is limited to what can be achieved from a stored XSS vector under the specified privilege level—for example, executing JavaScript in the context of a victim’s browser when they view the injected page.
How This Could Impact Your Website
Consider a small editorial site where a site owner manages content, internal staff (editors) publish articles, and an external contractor provides occasional contributions. If a contributor or other user with sufficient privileges can insert a crafted audio shortcode with a malicious src value, that payload will run when other users visit the page. Practical consequences include the disclosure of data accessible via the browser context (for example, session tokens or page-specific data), or the ability to run scripts that alter page content or capture input.
This increases the risk of targeted phishing or social engineering because an attacker can modify visible content or inject links and UI elements that appear legitimate to site editors or visitors. The vulnerability’s CVSS impact ratings indicate limited confidentiality and integrity impact and no direct availability impact—so while it does not imply full site takeover, it can enable browser-based attacks against users of the site.
If you’re unsure whether your site is affected or how to assess your current user roles and plugins, it may be worth having a professional review your setup.
Recommended Actions
- Update the affected plugin as soon as a patched version is available.
- Review and reduce unnecessary user roles, especially Contributor and higher privileges.
- Enforce strong passwords and enable two-factor authentication for editors and administrators.
- Remove unused or unmaintained plugins from your site.
- Monitor site activity and logs for unusual behavior or unexpected content changes.
If you’d like help reviewing your plugins, user roles, or overall WordPress security posture, our team at Freshy is happy to help.
References
- https://plugins.trac.wordpress.org/browser/wavesurfer-wp/tags/2.8.3/wavesurfer-wp.php#L739
- https://plugins.trac.wordpress.org/browser/wavesurfer-wp/trunk/wavesurfer-wp.php#L739
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3454006%40wavesurfer-wp&new=3454006%40wavesurfer-wp&sfp_email=&sfph_mail=
- https://www.wordfence.com/threat-intel/vulnerabilities/id/b507462d-1ce2-4463-93bf-635ee78274f6?source=cve
