CVE-2026-8905 | The Osiris Signature Banner plugin for WordPress is vulnerab… | CVSS 6.1 MEDIUM

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.

Metadata

CVE ID: CVE-2026-8905
State: PUBLISHED
Assigner: Wordfence
Reserved: 2026-05-18 21:24 UTC
Published: 2026-06-24 05:33 UTC
Last updated: 2026-06-24 05:33 UTC
Primary CWE: CWE-352
CWE-352 Cross-Site Request Forgery (CSRF)
Vendor / Product: osiris8 / Osiris Signature Banner
Sources: cve.org · NVD

Severity & Metrics

6.1 MEDIUM CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products (1)

Vendor	Product	Platform	Versions
osiris8	Osiris Signature Banner	—	0 ≤ 0.5

Weakness (CWE)

CWE	Source	Description
CWE-352	cna	CWE-352 Cross-Site Request Forgery (CSRF)

CVSS scores (1)

Score	Severity	Version	Source	Vector
6.1	MEDIUM	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

References (5)