Description
The Really Simple Security WordPress plugin before 9.8.0 does not check that the user is allowed to install Really Simple Security WordPress plugin before 9.8.0 before installing one from a user-supplied URL, allowing an administrator of a subsite on a multisite network to install and execute arbitrary code in the network-shared Really Simple Security WordPress plugin before 9.8.0 directory, which WordPress otherwise reserves to the network administrator. Exploitation requires the network administrator to have enabled the Really Simple Security WordPress plugin before 9.8.0 administration menu for subsites, which is not the default.
Published: 2026-08-30
Score: 6.6 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Mon, 31 Aug 2026 21:30:00 +0000

Type Values Removed Values Added
First Time appeared Really-simple-plugins
Really-simple-plugins really Simple Security
Wordpress
Wordpress wordpress
Vendors & Products Really-simple-plugins
Really-simple-plugins really Simple Security
Wordpress
Wordpress wordpress

Mon, 31 Aug 2026 15:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-284
CWE-285

Mon, 31 Aug 2026 13:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-269
Metrics cvssV3_1

{'score': 6.6, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Sun, 30 Aug 2026 07:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-284
CWE-285

Sun, 30 Aug 2026 06:30:00 +0000

Type Values Removed Values Added
Description The Really Simple Security WordPress plugin before 9.8.0 does not check that the user is allowed to install Really Simple Security WordPress plugin before 9.8.0 before installing one from a user-supplied URL, allowing an administrator of a subsite on a multisite network to install and execute arbitrary code in the network-shared Really Simple Security WordPress plugin before 9.8.0 directory, which WordPress otherwise reserves to the network administrator. Exploitation requires the network administrator to have enabled the Really Simple Security WordPress plugin before 9.8.0 administration menu for subsites, which is not the default.
Title Really Simple Security < 9.8.0 - Multisite Subsite Admin+ Arbitrary Plugin Installation via rsp_upgrade_install_plugin
References

Subscriptions

Really-simple-plugins Really Simple Security
Wordpress Wordpress
cve-icon MITRE

Status: PUBLISHED

Assigner: WPScan

Published:

Updated: 2026-08-31T12:38:05.969Z

Reserved: 2026-08-27T12:23:16.066Z

Link: CVE-2026-81766

cve-icon Vulnrichment

Updated: 2026-08-31T12:29:59.962Z

cve-icon NVD

Status : Deferred

Published: 2026-08-30T07:17:21.890

Modified: 2026-08-31T20:14:36.250

Link: CVE-2026-81766

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-31T21:15:05Z

Weaknesses