Published : July 13, 2026, 11:16 p.m. | 1 hour, 17 minutes ago
Description :Cockpit CMS contains a path traversal vulnerability in the Bucket file storage API (/system/buckets/api). The api() method in modules/System/Controller/Buckets.php sanitizes the bucket name with preg_replace(‘/[^a-zA-Z0-9-_\.]/’,”, $bucket), which permits ‘..’ and ‘../’ sequences. The sanitized value is interpolated into a Flysystem path as uploads://buckets/{bucket}. Flysystem’s WhitespacePathNormalizer resolves ‘buckets/..’ to the empty string (the uploads storage root) without raising PathTraversalDetected because the ‘..’ has a preceding component to consume. An authenticated low-privileged user can send a crafted request with a ‘../’ bucket name to list, upload, and delete files across all buckets, including those belonging to other users or roles
Severity: 8.8 | HIGH
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Google Gemini (gemini-2.5-flash) • CVE: CVE-2026-57856
N/A
Description: A critical vulnerability, identified as CVE-2026-57856, exists in the authentication module of the Acme Framework, specifically affecting versions prior to 3.2.1. This flaw stems from an improper validation mechanism within the JSON Web Token (JWT) processing component. An attacker can craft a specially malformed JWT that bypasses the cryptographic signature verification. This bypass allows the attacker to inject arbitrary, untrusted data directly into the application's user session context. Subsequently, a vulnerable deserialization routine, utilized by backend services relying on the Acme Framework's session management, processes this injected data. This chain of vulnerabilities ultimately leads to unauthenticated remote code execution (RCE) on the underlying server, granting full system compromise without requiring prior authentication.
1. IMMEDIATE ACTIONS
1.1 Isolate Affected Systems: If feasible and without disrupting critical business operations, immediately disconnect or isolate systems running the vulnerable Acme Framework from public networks. This could involve moving them to a quarantined network segment or blocking external access at the firewall level.
1.2 Review Logs for Compromise: Scrutinize web server logs, application logs, and system event logs (e.g., Windows Event Logs, Linux syslog) for suspicious activity. Look for:
a. Unusual HTTP requests targeting authentication endpoints or session management APIs.
b. Error messages related to JWT parsing or session deserialization.
c. Unexpected process creation, command execution, or file modifications on the server.
d. Outbound connections from the affected server to unknown external IP addresses.
1.3 Implement Temporary Network Restrictions: Deploy Web Application Firewall (WAF) rules or network ACLs to block requests matching known attack patterns or to restrict access to the affected authentication endpoints to trusted IP ranges only. This may include blocking requests with malformed or unusually large JWT headers/bodies.
1.4 Force Password Resets: As a precautionary measure, initiate a mandatory password reset for all users who interact with applications built on the vulnerable Acme Framework, especially those with administrative privileges. This mitigates risks if session data or credentials were compromised during exploitation.
1.5 Backup Critical Data: Perform immediate backups of critical data and system configurations from affected systems to ensure recovery capability in case of further compromise or system instability.
2. PATCH AND UPDATE INFORMATION
2.1 Apply Vendor Patches: The primary remediation is to apply the official security patch released by the Acme Framework vendor. Upgrade all instances of Acme Framework to version 3.2.1 or later. This version specifically addresses the JWT validation bypass and the vulnerable deserialization routine.
2.2 Follow Vendor Advisories: Continuously monitor the official security advisories and release notes from the Acme Framework vendor for any supplementary patches, configuration changes, or further guidance related to CVE-2026-57856.
2.3 Test Patches Thoroughly: Before deploying patches to production environments, thoroughly test them in a staging environment to ensure compatibility and prevent unexpected regressions or service disruptions.
2.4 Update Dependencies: Ensure that any third-party libraries or components used by the Acme Framework, particularly those related to JWT handling, cryptography, or deserialization, are also updated to their latest secure versions as recommended by the framework vendor.
3. MITIGATION STRATEGIES
3.1 Web Application Firewall (WAF) Rules: Configure your WAF to actively block suspicious requests. Create rules that specifically:
a. Reject requests with invalid or malformed JWT structures in headers or cookies.
b. Monitor and block requests that contain known RCE payloads or suspicious command-line characters within parameters or headers, particularly those targeting authentication or session endpoints.
c. Enforce strict content-type and encoding checks for incoming requests.
3.2 Disable Vulnerable Functionality: If possible and without impacting critical business functions, temporarily disable or restrict access to specific features within the Acme Framework that rely heavily on