CVE-2021-25111

English WordPress Admin <= 1.5.1.1 - Unauthenticated Open Redirect

2022-04-08 00:00

Strategic Overview

Status: Patched in 1.5.2
Affected Plugin: English WordPress Admin
Affected Version: <= 1.5.1.1
CVSS: 7.2High
Weakness type: CWE-601 · URL Redirection to Untrusted Site ('Open Redirect')
CVE: CVE-2021-25111

View all English WordPress Admin vulnerabilities

At a glance

CVE-2021-25111 is a high-severity URL Redirection to Untrusted Site ('Open Redirect') vulnerability in the English WordPress Admin WordPress plugin, affecting versions <= 1.5.1.1. It carries a CVSS score of 7.2 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 1.5.2; sites on affected versions should update now. Disclosed April 2022, reported by Krzysztof Zając.

Vulnerability Overview

The English WordPress Admin WordPress plugin before 1.5.2 does not validate the admin_custom_language_return_url before redirecting users to it, leading to an open 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, and no interaction from a victim user.

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

Reaching this weakness in English WordPress Admin <= 1.5.1.1 takes no account at all. 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 English WordPress Admin the fix is 1.5.2: builds <= 1.5.1.1 are affected, anything from 1.5.2 onward is not.

Remediation

Update to version 1.5.2, or a newer patched version

How does WordSec protect against this?

Requests carrying this pattern arrive without a session, so nothing upstream of the firewall gets a chance to reject them: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: English WordPress Admin 1.5.2 closes this, and updating the plugin is the step that ends it.

Firewall
Login Security
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-25111 https://www.wordfence.com/threat-intel/vulnerabilities/id/1bd007fd-eee9-4c3c-b509-63e180e3fd28 https://nvd.nist.gov/vuln/detail/CVE-2021-25111

CVSS Vector

7.2

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

Base

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

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