CVE-2026-40332 Masa CMS open redirect via improper handling of scheme-relative URLs
Attackers can redirect users to malicious sites via crafted URLs, enabling phishing and potential token exposure in Masa CMS.
- 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-2026-40332?
CVE-2026-40332 is a medium-severity vulnerability in MasaCMS, published on 6 May 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
Masa CMS is affected by an Open Redirect vulnerability due to improper handling of scheme-relative URLs. The application incorrectly interprets paths beginning with double slashes (//) as internal paths, failing to validate the redirect target before processing. The application treats these values as internal paths and processes them without confirming that the redirect target remains on the local site.
An attacker can craft a URL on the trusted Masa CMS domain that redirects a victim to an external attacker-controlled site. This can be used for phishing and, in some authentication flows, may expose tokens or other sensitive data to the external site. This issue has been fixed in versions 7.2.10, 7.3.15, 7.4.10, and 7.5.3. As a workaround, reject or rewrite redirect parameters that begin with // and consider disabling forceDirectoryStructure if compatible with the deployment.
Weakness: CWE-601
Which versions are affected by CVE-2026-40332?
How do I fix CVE-2026-40332?
No fix has been published for CVE-2026-40332 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-40332 being exploited?
There is no known exploitation of CVE-2026-40332 in the wild and no public exploit code.
Sources
Also known as GHSA-xw99-h3mw-wj47.