Surfer <= 1.8.1.758 - Authenticated (Contributor+) Privilege Escalation
Strategic Overview
- Status
- Patched in 1.8.1.759
- Affected Plugin
- Surfer – WordPress Plugin
- Affected Version
<= 1.8.1.758- CVSS
- 6.3Medium
- Weakness type
- CWE-269 · Improper Privilege Management
- CVE
CVE-2026-118639
At a glance
CVE-2026-118639 is a medium-severity Improper Privilege Management vulnerability in the Surfer WordPress plugin, affecting versions <= 1.8.1.758. It carries a CVSS score of 6.3 (reachable over the network; low attack complexity). Exploitation requires an authenticated account at Contributor level or above. The issue is fixed in version 1.8.1.759; sites on affected versions should update now. Disclosed November 2026, reported by Usama Arshad.
Vulnerability Overview
The Surfer plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 1.8.1.758. This is due to insufficient restriction on the capabilities a user may grant themselves. This makes it possible for authenticated attackers, with contributor-level access and above, to elevate their privileges beyond those intended for their role.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no interaction from a victim user.
CWE-269: Improper Privilege Management
Reaching this weakness in Surfer <= 1.8.1.758 takes an account at Contributor level or above. Improper privilege management means the code lets an account end up with capabilities its role should not have.
It converts a low-privileged account into an administrative one, which makes every other restriction on the site irrelevant. For Surfer the fix is 1.8.1.759: builds <= 1.8.1.758 are affected, anything from 1.8.1.759 onward is not.
Remediation
Update to version 1.8.1.759, or a newer patched version
How does WordSec protect against this?
Because it turns on account access, WordSec's login security is the relevant layer: role-based two-factor, captcha and brute-force limits raise the cost of getting the account this needs. None of that substitutes for the fix: Surfer 1.8.1.759 closes this, and updating the plugin is the step that ends it.
- Login Security
- Alerts
External References
Related records
Other vulnerabilities in Surfer – WordPress Plugin
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