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PatchSiren cyber security CVE debrief

CVE-2026-25439 fs-code CVE debrief

CVE-2026-25439 is a HIGH-severity vulnerability (CVSS Score: 8.1) affecting Booknetic plugin versions up to 4.8.5. This vulnerability allows unauthenticated attackers to bypass authentication mechanisms, potentially leading to unauthorized access and account takeover. Organizations using affected versions should prioritize patching. The vulnerability was published on June 17, 2026, and immediately gained attention due to its severity and potential impact. Users of the Booknetic plugin are urged to update to a patched version to mitigate this risk.

Vendor
fs-code
Product
Booknetic
CVSS
HIGH 8.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-17
Original CVE updated
2026-06-17
Advisory published
2026-06-17
Advisory updated
2026-06-17

Who should care

Administrators and security teams responsible for WordPress installations using the Booknetic plugin, especially those with versions up to 4.8.5, should be aware of this vulnerability. Given its high severity and potential for exploitation, immediate attention is necessary to prevent unauthorized access.

Technical summary

CVE-2026-25439 is classified as an unauthenticated broken authentication vulnerability in the Booknetic plugin for WordPress. The vulnerability has a CVSS Score of 8.1, indicating high severity. It is characterized by CWE-288, which involves authentication bypass. The vulnerability allows attackers to bypass authentication mechanisms without requiring any user interaction or privileges (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H).

Defensive priority

High

Recommended defensive actions

  • Update the Booknetic plugin to a version beyond 4.8.5 immediately.
  • Review and enforce strong authentication mechanisms for all WordPress installations.
  • Implement Web Application Firewall (WAF) rules to detect and prevent exploitation attempts.
  • Regularly monitor WordPress installations for updates and apply patches promptly.
  • Consider implementing multi-factor authentication for all users.
  • Limit login attempts and monitor for suspicious activity.
  • Perform regular security audits of WordPress plugins and themes.

Evidence notes

The information provided is based on data from official sources, including CVE.org and the National Vulnerability Database (NVD). The CVE record and NVD details confirm the vulnerability's existence and provide technical insights. Additional mitigation details are available from Patchstack, highlighting the importance of updating the Booknetic plugin.

Official resources

public