CVE-2026-27397Network attack vector

Subscriber-level unauthorized actions via unchecked object key

Published Mar 19, 2026 · Updated Mar 19, 2026

Authorization bypass in Really Simple Security Pro 9.5.4.0 and earlier allows remote authenticated users to perform unauthorized actions. The plugin accepts a user-controlled object key without validating that the requesting account is authorized for the referenced object; public sources do not identify the endpoint or action. Subscriber-level WordPress access is sufficient, and the disclosed impact is limited to an unauthorized action rather than demonstrated data disclosure or code execution.

CVSS severity6.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in Really Simple Security Pro 9.5.4.0 and earlier allows remote authenticated users to perform unauthorized actions. The plugin accepts a user-controlled object key without validating that the requesting account is authorized for the referenced object; public sources do not identify the endpoint or action. Subscriber-level WordPress access is sufficient, and the disclosed impact is limited to an unauthorized action rather than demonstrated data disclosure or code execution.

The record

CVE
CVE-2026-27397
Published
Mar 19, 2026
Updated
Mar 19, 2026
Vendor
Really Simple Plugins
Product
Really Simple Security Pro
Classifications
CWE-639, CAPEC-180, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=n/a <=9.5.4.0 changes=[{"at":"9.5.4.1","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Really Simple Plugins · Really Simple Security Proversion=n/a <=9.5.4.0 changes=[{"at":"9.5.4.1","status":"unaffected"}]

Published CVSS scores

4.3WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
6.5PatchstackCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
CAPEC-180Exploiting Incorrectly Configured Access Control Security Levels
T1190Exploit Public-Facing Application

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

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Your stack

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