CVE-2021-25028

Event Tickets <= 5.2.1 - Open Redirect

2021-12-22 00:00

Strategic Overview

Status: Patched in 5.2.2
Affected Plugin: Event Tickets and Registration
Affected Version: <= 5.2.1
CVSS: 6.1Medium
Weakness type: CWE-601 · URL Redirection to Untrusted Site ('Open Redirect')
CVE: CVE-2021-25028

View all Event Tickets and Registration vulnerabilities

At a glance

CVE-2021-25028 is a medium-severity URL Redirection to Untrusted Site ('Open Redirect') vulnerability in the Event Tickets and Registration WordPress plugin, affecting versions <= 5.2.1. It carries a CVSS score of 6.1 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 5.2.2; sites on affected versions should update now. Disclosed December 2021, reported by Krzysztof Zając.

Vulnerability Overview

The Event Tickets WordPress plugin before 5.2.2 does not validate the tribe_tickets_redirect_to parameter before redirecting the user to the given value, leading to an arbitrary redirect issue

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 privileges on the target site.

CWE-601: URL Redirection to Untrusted Site ('Open Redirect')

Reaching this weakness in Event Tickets and Registration <= 5.2.1 takes a caller who can reach the endpoint. An open redirect is a page that takes a destination from the request and sends the browser there without checking that the destination belongs to the site.

A link that starts on a trusted domain finishes on an attacker's, which is what makes phishing and consent-screen abuse credible to the person clicking it. For Event Tickets and Registration the fix is 5.2.2: builds <= 5.2.1 are affected, anything from 5.2.2 onward is not.

Remediation

Update to version 5.2.2, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Event Tickets and Registration: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Event Tickets and Registration 5.2.2 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-25028 https://www.wordfence.com/threat-intel/vulnerabilities/id/c9ce2107-18bd-4331-bd8e-578f56fdebf7 https://nvd.nist.gov/vuln/detail/CVE-2021-25028

Related records

Other vulnerabilities in Event Tickets and Registration

CVSS Vector

6.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionRequired
ScopeChanged
ConfidentialityLow
IntegrityLow
AvailabilityNone

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