Critical vulnerability in popular WordPress plugin threatens millions of websites
- Thảo Nguyên
- 1 day ago
- 3 min read
If your business operates a website powered by WordPress and utilizes a Single Sign-On (SSO) tool, this is a critical security update you cannot afford to ignore. A recently discovered vulnerability in a popular plugin allows remote attackers to gain full control over the entire system.
How severe is this security vulnerability?
This security flaw affects the WordPress OAuth Single Sign-On (SSO) (OAuth Client) plugin, a tool developed by miniOrange. The vulnerability was publicly disclosed by cybersecurity firm Patchstack on July 9, 2026, under the identifier CVE-2026-57807.
The severity of this vulnerability is rated as a red alert, achieving a near-perfect CVSS score of 9.8/10. What makes this flaw particularly alarming is that exploitation attempts are trivial to execute:
No authentication required: Attackers do not need to be logged in or possess any prior access privileges.
No user interaction required: The system can be compromised without any administrator or user clicking on any link.
Low attack complexity: The flaw can be easily exploited from anywhere over the internet.
How attackers can take over the website
Technically, this flaw is categorized as an Authentication Bypass (falling under category A7: Identification and Authentication Failures of the OWASP Top 10 standard). Malicious actors leverage a vulnerability within the plugin's password reset mechanism (classified under CWE-288 and CAPEC-50).
Specifically, the system contains an alternate authentication pathway that lacks proper security validation checks. By exploiting this "shortcut," attackers can bypass the login wall and impersonate any user on the website, including the highest-privileged Administrator account.
Once administrator privileges are gained, attackers have absolute control over the website, leading to severe consequences such as:
Stealing critical data.
Injecting malicious content onto the front end.
Installing backdoors to maintain covert persistence within the system.
Launching lateral attacks into the entire hosting server environment.
Affected versions and the risk of widespread exploitation
This threat is present in all versions of the plugin up to and including 38.5.8.
Patchstack has classified this as a high-priority vulnerability requiring immediate attention. Experts forecast that this flaw will soon be exploited in automated scanning campaigns and mass attacks. Malicious actors could target thousands of websites simultaneously, regardless of the site's size or traffic volume.
Emergency remediation for administrators
Currently, the developer miniOrange has not released an official patch for this vulnerability. However, to protect users, Patchstack has rolled out a virtual patch to temporarily block remote scanning and exploitation attempts.
To guarantee absolute security, web administrators are strongly urged to take the following steps immediately:
Emergency deactivation and removal: The strongest recommendation right now is to temporarily deactivate and completely remove this plugin from all live WordPress systems connected to the internet until the developer releases an official security update.
Temporary mitigations: If the plugin cannot be removed immediately, you must configure Web Application Firewall (WAF) rules or implement IP allowlisting to tightly restrict access to WordPress login and password reset endpoints, minimizing the overall attack surface.
This critical vulnerability was originally discovered and reported by security researcher Kim Dvash on June 6, 2026. Subsequently, the National Vulnerability Database (NVD) officially logged the flaw on July 10, 2026. While awaiting a permanent fix, administrators must proactively monitor the WordPress plugin repository and the latest advisories from miniOrange to apply the official patch as soon as it becomes available.
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