What’s Vulnerable › Vulnerabilities

CVE-2026-8905: Osiris Signature Banner <= 0.5 - Cross-Site Request Forgery to Stored Cross-Site Scripting via 'prepend_text' Parameter

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-24 · updated 2026-06-25
• Weakness: CWE-352

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.

Affected products

• osiris8 Osiris Signature Banner: through 0.5

References

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

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