CVE-2024-32643: Masacms Auth Bypass Vulnerability

CVE-2024-32643 Overview

CVE-2024-32643 is an authorization bypass vulnerability in Masa CMS, an open source Enterprise Content Management platform. The flaw allows unauthenticated attackers to render pages that should be restricted to specific user groups by appending a /tag/ declaration to the page URL. The CMS fails to enforce group-based access controls when this URL pattern is present, exposing protected content to anyone on the network. The issue is tracked under [CWE-863] Incorrect Authorization and affects all releases prior to 7.2.8, 7.3.13, and 7.4.6.

Critical Impact
Remote, unauthenticated attackers can bypass group-based access restrictions and view restricted content by manipulating page URLs with a /tag/ segment.

Affected Products

Masa CMS versions prior to 7.2.8 (7.2.x branch)
Masa CMS versions prior to 7.3.13 (7.3.x branch)
Masa CMS versions prior to 7.4.6 (7.4.x branch)

Discovery Timeline

2025-12-03 - CVE-2024-32643 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-32643

Vulnerability Analysis

The vulnerability resides in how Masa CMS processes URL routing when a /tag/ path segment is present. Under normal conditions, the CMS enforces group-based access controls before rendering page content. When the URL is modified to include a /tag/ declaration, the request handler skips the group restriction check and proceeds to render the page. This allows unauthorized users to access content intended for specific authenticated user groups.

The flaw is classified as [CWE-863] Incorrect Authorization. The CMS performs an authorization check, but the check is logically incorrect for URLs containing the /tag/ segment. Confidentiality of restricted content is directly impacted, while integrity and availability remain unaffected.

Root Cause

The root cause is a missing or improperly scoped authorization check in the tag-based content rendering path. The page rendering logic for tagged content does not consult the same group restriction enforcement applied to standard page requests. As a result, the group access policy is bypassed entirely when content is requested through the tag route.

Attack Vector

Exploitation requires only network access to the Masa CMS instance. An attacker crafts a URL targeting a restricted page and inserts /tag/ into the path. No authentication, user interaction, or specialized tooling is required. The attacker then receives the rendered page content directly in the HTTP response. The EPSS score for this issue is 0.306% (22.035 percentile), reflecting low observed exploitation activity. No public proof-of-concept is currently available, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.

A technical description of the fix is documented in the GitHub commit d1a2e57 and the Masa CMS Security Advisory GHSA-f469-jh82-97fv.

Detection Methods for CVE-2024-32643

Indicators of Compromise

HTTP GET requests containing /tag/ segments targeting pages that normally require group-based authentication.
Web server access logs showing successful 200 responses to /tag/ requests from unauthenticated sessions.
Spikes in requests to tag-based URLs from a single IP enumerating restricted page paths.

Detection Strategies

Review web application firewall (WAF) and reverse proxy logs for URL patterns matching */tag/* directed at protected sections of the site.
Correlate session identifiers against rendered content to identify cases where unauthenticated or low-privilege sessions received restricted page bodies.
Compare response sizes and content hashes for /tag/ requests against expected public-content baselines to surface unauthorized renders.

Monitoring Recommendations

Enable verbose access logging on the Masa CMS application server and forward logs to a centralized SIEM for retention and analysis.
Alert on anomalous request rates to tag-prefixed URLs, particularly from external IP ranges.
Track HTTP referrer and user-agent patterns to identify automated scanning of restricted content paths.

How to Mitigate CVE-2024-32643

Immediate Actions Required

Upgrade Masa CMS to version 7.2.8, 7.3.13, or 7.4.6 depending on the branch in use.
Audit web server access logs for prior /tag/ requests to restricted pages and assess potential content exposure.
Inventory any sensitive content protected only by group restrictions and consider rotating any credentials, links, or tokens that may have been exposed.

Patch Information

The vendor fix is included in Masa CMS releases 7.2.8, 7.3.13, and 7.4.6. The corrective code change is published in GitHub commit d1a2e57. Full advisory details are available in GHSA-f469-jh82-97fv. Apply the patch corresponding to your deployed major version.

Workarounds

If immediate patching is not feasible, configure a WAF or reverse proxy rule to block or challenge requests containing /tag/ segments to restricted page paths.
Restrict access to the Masa CMS instance via network controls or VPN until the upgrade is applied.
Temporarily move highly sensitive content out of the CMS or behind an additional authentication layer.

bash

# Example NGINX rule to block /tag/ access to a restricted path until patching
location ~* ^/restricted-section/.*/tag/ {
    return 403;
}