The Osiris Signature Banner plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 0.5. This is due to missing or incorrect nonce validation on a function. This makes it possible for unauthenticated attackers to update settings and inject malicious web scripts via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact Low

Integrity Impact Low

Availability Impact None

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

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Vendors Products
References
Link Providers
https://plugins.trac.wordpress.org/browser/osiris-signature-banner/tags/0.5/osiris-signature-banner.php#L107 cve-icon
https://plugins.trac.wordpress.org/browser/osiris-signature-banner/tags/0.5/osiris-signature-banner.php#L118 cve-icon
https://plugins.trac.wordpress.org/browser/osiris-signature-banner/tags/0.5/osiris-signature-banner.php#L139 cve-icon
https://plugins.trac.wordpress.org/browser/osiris-signature-banner/tags/0.5/osiris-signature-banner.php#L189 cve-icon
https://www.wordfence.com/threat-intel/vulnerabilities/id/03226722-000c-4bfe-a09b-e75882274845?source=cve cve-icon
History

Wed, 24 Jun 2026 06:30:00 +0000

Type Values Removed Values Added
Description The Osiris Signature Banner plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 0.5. This is due to missing or incorrect nonce validation on a function. This makes it possible for unauthenticated attackers to update settings and inject malicious web scripts via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.
Title Osiris Signature Banner <= 0.5 - Cross-Site Request Forgery to Stored Cross-Site Scripting via 'prepend_text' Parameter
Weaknesses CWE-352
References
Metrics cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'}
cve-icon MITRE

Status: PUBLISHED

Assigner: Wordfence

Published:

Updated: 2026-06-24T05:33:21.111Z

Reserved: 2026-05-18T21:24:37.598Z

Link: CVE-2026-8905

cve-icon Vulnrichment

No data.

cve-icon NVD

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cve-icon Redhat

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cve-icon OpenCVE Enrichment

Updated: 2026-06-24T09:15:06Z