Vulnerability · Published May 6, 2026 · Assigned by GitHub_M

CVE-2026-40332Masa CMS open redirect via improper handling of scheme-relative URLs

Medium 5.3

In plain English

A medium-severity open redirect in MasaCMS from MasaCMS. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities).

Severity (CVSS 4.0)5.3Medium

Exploit odds (30 days)0.3%top 73.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
MasaCMS	MasaCMS	< 7.2.10>= 7.3.0, < 7.3.15>= 7.4.0, < 7.4.10>= 7.5.0, < 7.5.3

Weakness: CWE-601 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

References

https://github.com/MasaCMS/MasaCMS/security/advisories/GHSA-xw99-h3mw-wj47 x_refsource_CONFIRM