CVE-2026-4420 Stored XSS via Page Creating functionality in Bludit
Authenticated attackers can inject malicious scripts via page tags, leading to code execution and potential privilege escalation when victims visit the resource.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-4420?
CVE-2026-4420 is a medium-severity cross-site scripting vulnerability in Bludit, published on 7 Apr 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Bludit is vulnerable to Stored Cross-Site Scripting (XSS) in its page creating functionality. An authenticated attacker with page creation privileges (such as Author, Editor, or Administrator) can embed a malicious JavaScript payload in the tags field of a newly created article. This payload will be executed when a victim visits the URL of the uploaded resource. The uploaded resource itself is accessible without authentication. Critically, this vulnerability could be used to automatically create a new site administrator if the victim has enough privileges.
The vendor was notified early about this vulnerability, but didn't respond with the details of vulnerability or vulnerable version range. Only versions 3.17.2 and 3.18.0 were tested and confirmed as vulnerable, other versions were not tested and might also be vulnerable.
Weakness: CWE-79
Which versions are affected by CVE-2026-4420?
It affects 1 product.
Products include Bludit Bludit.
How do I fix CVE-2026-4420?
No fix has been published for CVE-2026-4420 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-4420 being exploited?
There is no known exploitation of CVE-2026-4420 in the wild and no public exploit code.
Other vulnerabilities in Bludit
Sources
Also known as GHSA-w5x8-257x-9rv5.