CVE-2026-40332 Details
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.
An open redirect vulnerability has been identified in Masa CMS versions through 7.5.2. This issue arises from improper handling of scheme-relative URLs, where paths starting with double slashes are misinterpreted as internal. The application fails to validate redirect targets before processing, allowing attackers to craft URLs that redirect users to external, attacker-controlled sites. This vulnerability can be exploited for phishing attacks and, in certain authentication scenarios, may result in the leakage of tokens or sensitive data to the external site.
Users are advised to upgrade to Masa CMS versions 7.2.10, 7.3.15, 7.4.10, or 7.5.3. If an immediate upgrade is not possible, consider adjusting the configuration to disable the forceDirectoryStructure setting, implementing a custom filter to sanitize redirect parameters, or using Web Application Firewall rules to block requests with scheme-relative URLs.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed May 6, 2026CISA-ADP
Assessed May 7, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/MasaCMS/MasaCMS/security/advisories/GHSA-xw99-h3mw-wj47 | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-601 | URL Redirection to Untrusted Site ('Open Redirect') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Masa CMS | <= 7.5.2 (semver) |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 6, 2026 | New CVE Received | [email protected] |