CVE-2026-89080

Really Simple Security <= 9.8.0 - Unauthenticated Two-Factor Authentication Bypass

2026-09-11 00:00

Strategic Overview

Status: Patched in 9.8.1
Affected Plugin: Really Simple Security – Simple and Performant Security (formerly Really Simple SSL)
Affected Version: <= 9.8.0
CVSS: 5.3Medium
Weakness type: CWE-693 · Protection Mechanism Failure
CVE: CVE-2026-89080

View all Really Simple Security – Simple and Performant Security (formerly Really Simple SSL) vulnerabilities

At a glance

CVE-2026-89080 is a medium-severity Protection Mechanism Failure vulnerability in the Really Simple Security WordPress plugin, affecting versions <= 9.8.0. It carries a CVSS score of 5.3 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 9.8.1; sites on affected versions should update now. Disclosed September 2026, reported by Charles Vosburgh.

Vulnerability Overview

The Really Simple Security – Simple and Performant Security (formerly Really Simple SSL) plugin for WordPress is vulnerable to Two-Factor Authentication Bypass in all versions up to, and including, 9.8.0. This makes it possible for unauthenticated attackers to bypass two-factor authentication.

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-693: Protection Mechanism Failure

The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.

Remediation

Update to version 9.8.1, or a newer patched version

How does WordSec protect against this?

This one needs no account at all, which puts it outside what login hardening can reach; WordSec's login security narrows the account-level paths around it, and the firewall is what inspects the request itself. None of that substitutes for the fix: Really Simple Security 9.8.1 closes this, and updating the plugin is the step that ends it.

Login Security
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-89080 https://www.wordfence.com/threat-intel/vulnerabilities/id/96d1d456-a96f-4566-8d5e-6c8aff74137d https://nvd.nist.gov/vuln/detail/CVE-2026-89080

Related records

Other vulnerabilities in Really Simple Security – Simple and Performant Security (formerly Really Simple SSL)

CVSS Vector

5.3

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

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityNone
IntegrityLow
AvailabilityNone

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