CVE-2026-19848: 
WordPress vulnerability analysis and mitigation

CVE-2026-19848 is a stored shortcode injection vulnerability in the ProfilePress WordPress plugin (also known as wp-user-avatar) that allows unauthenticated attackers to inject and execute arbitrary shortcodes via two profile fields rendered on public pages. Affected versions are all releases before 4.17.1. The vulnerability was discovered by researcher Jakub Herman, publicly disclosed on August 19, 2026, and assigned a CVSS v3.1 base score of 6.5 (Medium) (WPScan, GitHub Advisory).

The root cause is improper input sanitization (CWE-74 — Improper Neutralization of Special Elements in Output Used by a Downstream Component) in two profile fields of the ProfilePress plugin, specifically the Display Name field and at least one other profile field. The plugin fails to strip WordPress shortcodes from user-supplied input before storing and rendering the values on public-facing profile pages, causing the shortcodes to be executed server-side when any visitor views the page. Because no authentication is required to set these profile fields, the attack is fully unauthenticated and automatable. A proof-of-concept is scheduled for public release on September 2, 2026, to allow time for users to update (WPScan, GitHub Advisory).

Successful exploitation allows an unauthenticated attacker to persistently store malicious shortcodes in profile fields that execute whenever any user — including unauthenticated visitors — views the affected public profile page. The primary confirmed impact is information disclosure: a chosen user's email address, login date, and registration date can be exposed to the attacker. The integrity impact is low, as the attacker can influence rendered page content, but there is no availability impact. Depending on the shortcodes available in the WordPress environment, the actual scope of information disclosure could extend beyond the documented fields (WPScan, GitHub Advisory).

As of the disclosure date, there is no public proof-of-concept exploit and no evidence of in-the-wild exploitation (WPScan). CISA's SSVC assessment classifies the vulnerability as automatable with partial technical impact and no known exploitation (GitHub Advisory). The EPSS score is 0.0, reflecting a currently low probability of exploitation in the near term. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. A PoC is planned for public release on September 2, 2026.

1. Reconnaissance: Identify WordPress sites running the ProfilePress (wp-user-avatar) plugin in a version before 4.17.1 using tools such as WPScan or by inspecting page source for plugin indicators.
2. Register or access a user account: Create a new user account on the target WordPress site (registration may be open) or use an existing low-privilege account, as no elevated privileges are required.
3. Inject shortcode into profile field: Navigate to the profile editing page and insert a WordPress shortcode (e.g., [user_email] or similar data-disclosure shortcodes) into the vulnerable Display Name or other affected profile field.
4. Save the profile: Submit the profile update; the plugin stores the shortcode without sanitization.
5. Trigger execution: When any visitor (including unauthenticated users) views the public profile page of the targeted account, the stored shortcode is executed by WordPress, disclosing the chosen user's email address, login date, and registration date to the attacker (WPScan).

• Logs: WordPress access logs showing POST requests to profile update endpoints (e.g., /wp-admin/profile.php or ProfilePress-specific profile edit URLs) containing shortcode syntax such as [user_email], [user_login], or similar bracket-enclosed strings in field parameters.
• Database: Unusual shortcode strings (e.g., [user_email], [user_registered]) stored in the wp_usermeta or wp_users table within display name or other ProfilePress profile fields.
• Network: Repeated GET requests to public profile pages from IP addresses that previously submitted profile updates with shortcode payloads, potentially indicating automated harvesting of disclosed data.

Update the ProfilePress WordPress plugin to version 4.17.1 or later, which strips shortcodes from the affected profile fields before rendering them on public pages (WPScan, GitHub Advisory). No official configuration-based workaround has been published; upgrading is the recommended and only confirmed remediation. As an interim measure, site administrators may consider disabling public profile pages or restricting user registration until the update can be applied.