CVE-2026-8905 Osiris Signature Banner <= 0.5 - Cross-Site Request Forgery to Stored Cross-Site Scripting via 'prepend_text' Parameter
Attackers can trick admins into updating settings to inject malicious scripts via CSRF, leading to stored XSS and potential site compromise.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-8905?
CVE-2026-8905 is a medium-severity vulnerability in osiris8 Osiris Signature Banner, published on 24 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-352
Which versions are affected by CVE-2026-8905?
How do I fix CVE-2026-8905?
No fix has been published for CVE-2026-8905 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-8905 being exploited?
There is no known exploitation of CVE-2026-8905 in the wild and no public exploit code.
Sources
Also known as GHSA-p4m8-3gv5-584p.