CVE-2026-84777Network attack vectorHinoki check available

Account access via XML-RPC 2FA bypass

Published Sep 3, 2026 · Updated Sep 3, 2026

Authentication bypass in Really Simple Security 9.8.0 and earlier allows remote attackers to bypass 2FA through XML-RPC. The XML-RPC login path accepts primary credentials without invoking the plugin's configured two-factor challenge. The flaw requires XML-RPC and 2FA to be enabled for the targeted account, allowing account access when its primary credentials are known.

CVSS severity7.4
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Authentication bypass in Really Simple Security 9.8.0 and earlier allows remote attackers to bypass 2FA through XML-RPC. The XML-RPC login path accepts primary credentials without invoking the plugin's configured two-factor challenge. The flaw requires XML-RPC and 2FA to be enabled for the targeted account, allowing account access when its primary credentials are known.

The record

CVE
CVE-2026-84777
Published
Sep 3, 2026
Updated
Sep 3, 2026
Vendor
Really Simple Plugins
Product
Really Simple Security
Classifications
CWE-288, CAPEC-50, T1078
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 3, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=n/a <=9.8.0 changes=[{"at":"9.8.1","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Really Simple Plugins · Really Simple Securityversion=n/a <=9.8.0 changes=[{"at":"9.8.1","status":"unaffected"}]

Published CVSS scores

7.4PatchstackCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-288Authentication Bypass Using an Alternate Path or Channel
CAPEC-50Password Recovery Exploitation
T1078Valid Accounts

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo