CVE-2026-3552: SurfLink < 2.6.0 - Missing Authorization to Authenticated (Subscriber+) 410 Gone URL Import via 'surfl_import_410' AJAX Action

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-11 · updated 2026-07-13
Weakness: CWE-862

Description

The SurfLink - Ultimate Link Manager plugin for WordPress is vulnerable to unauthorized data modification due to a missing capability check on the ajax_import_410() function in all versions up to 2.6.0. This is due to a missing capability check (current_user_can()) and missing nonce verification (check_ajax_referer()) in the ajax_import_410() function, while all other AJAX handlers in the same class (ajax_add_single_410, ajax_save_editted_410, ajax_delete_410, ajax_bulk_410_delete, ajax_empty_410, ajax_export_410) properly implement both authorization and nonce checks. This makes it possible for authenticated attackers, with Subscriber-level access and above, to import arbitrary URLs into the 410 Gone database table via the surfl_import_410 AJAX action. Injected URLs will cause the site to return HTTP 410 Gone responses to all visitors accessing those paths, potentially causing denial of service for legitimate pages and SEO damage through search engine delisting.

Affected products

surflabtech SurfLink – Link Manager & Backup Restore: before 2.6.0 — fixed in 2.6.0

How to fix

Upgrade to a fixed version: surflabtech SurfLink – Link Manager & Backup Restore 2.6.0. Check the vendor advisory for mitigations.

References

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