PatchSiren cyber security CVE debrief

CVE-2026-13176 Eventin CVE debrief

The Eventin WordPress plugin, specifically versions before 4.1.21, contains a vulnerability that allows users with contributor-level access or higher to trigger blind server-side requests to arbitrary hosts. This is due to insufficient validation of user-supplied webhook URLs associated with events and a lack of event ownership verification. The vulnerability's impact is considered low, with a CVSS score of 2.7. Users of the Eventin WordPress plugin, particularly those with contributor-level access and above, should verify and update their plugin versions to minimize potential impact. Security teams and vulnerability management teams should be aware of this vulnerability to ensure appropriate monitoring and defensive measures are in place. Platform operators and administrators should review their system configurations and access controls to prevent exploitation. Further verification is needed to assess the full impact and to confirm affected systems. Defenders should verify plugin versions, review server-side request logs for unusual activity, and ensure that contributor access is appropriately restricted.

Vendor: Eventin
Product: Eventin WordPress plugin
CVSS: LOW 2.7
CISA KEV: Not listed in stored evidence
Original CVE published: 2026-08-21
Original CVE updated: 2026-08-21
Advisory published: 2026-08-21
Advisory updated: 2026-08-21

Who should care

Users of the Eventin WordPress plugin, particularly those with contributor-level access and above, should verify and update their plugin versions to minimize potential impact. Additionally, security teams and vulnerability management teams should be aware of this vulnerability to ensure appropriate monitoring and defensive measures are in place. Platform operators and administrators should review their system configurations and access controls to prevent exploitation.

Technical summary

The Eventin WordPress plugin, specifically versions before 4.1.21, does not properly validate user-supplied webhook URLs associated with events and fails to verify event ownership. This oversight allows users with contributor-level access or higher to trigger blind server-side requests to arbitrary hosts, potentially leading to security issues such as SSRF (Server-Side Request Forgery). The vulnerability's impact is considered low, with a CVSS score of 2.7, emphasizing the need for users to update their plugin versions and monitor their environments for unusual server-side requests.

Defensive priority

Low-priority defensive review recommended due to limited CVSS score of 2.7 and lack of detailed information.

Recommended defensive actions

Verify Eventin WordPress plugin version and update to 4.1.21 or later if necessary
Restrict contributor-level access and above to minimize potential impact
Monitor server-side requests for unusual activity

Evidence notes

The evidence provided indicates a vulnerability in the Eventin WordPress plugin before version 4.1.21. This vulnerability allows users with contributor-level access and above to trigger blind server-side requests to arbitrary hosts due to insufficient validation of user-supplied webhook URLs stored on events and lack of event ownership verification. Further verification is needed to assess the full impact and to confirm affected systems. Defenders should verify plugin versions, review server-side request logs for unusual activity, and ensure that contributor access is appropriately restricted.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-08-21T12:16:22.140Z and has not been modified since then.