CVE-2021-34254 Open redirect in n/a
Attackers can redirect users to malicious sites via insufficient URL sanitization in Umbraco CMS booting page.
- 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-2021-34254?
CVE-2021-34254 is a medium-severity vulnerability in Umbraco Umbraco Cms, published on 28 Jun 2021. 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
Umbraco CMS before 7.15.7 is vulnerable to Open Redirection due to insufficient url sanitization on booting.aspx.
Weakness: CWE-601
Which versions are affected by CVE-2021-34254?
It affects 1 product.
Products include Umbraco Umbraco Cms.
How do I fix CVE-2021-34254?
No fix has been published for CVE-2021-34254 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-34254 being exploited?
There is no known exploitation of CVE-2021-34254 in the wild and no public exploit code.
Other vulnerabilities in Umbraco Umbraco Cms
- CVE-2025-67288 Umbraco CMS has an arbitrary file upload vulnerability
- CVE-2014-10074 File upload in n/a
- CVE-2012-1301 Server-side request forgery in n/a
- CVE-2012-10054 Umbraco CMS < 4.7.1 codeEditorSave.asmx RCE
- CVE-2025-32017 Umbraco has a Management API Vulnerability to Path Traversal With Authenticated Users
Sources
Also known as GHSA-862x-hrm8-ch77.