CVE-2026-25058: Vexa Auth Bypass Vulnerability

CVE-2026-25058 Overview

CVE-2026-25058 is a Missing Authentication vulnerability affecting Vexa, an open-source, self-hostable meeting bot API and meeting transcription API. Prior to version 0.10.0-260419-1910, the Vexa transcription-collector service exposes an internal endpoint GET /internal/transcripts/{meeting_id} that returns transcript data for any meeting without any authentication or authorization checks. This vulnerability allows unauthenticated attackers to enumerate all meeting IDs, access any user's meeting transcripts without credentials, and steal confidential business conversations, passwords, and/or personally identifiable information (PII).

Critical Impact

Unauthenticated attackers can access sensitive meeting transcripts containing confidential business conversations, credentials, and PII without any authentication.

Affected Products

• Vexa versions prior to 0.10.0-260419-1910
• Vexa transcription-collector service with exposed internal endpoints
• Self-hosted Vexa meeting bot API deployments

Discovery Timeline

• 2026-04-20 - CVE CVE-2026-25058 published to NVD
• 2026-04-23 - Last updated in NVD database

Technical Details for CVE-2026-25058

Vulnerability Analysis

This vulnerability is classified as CWE-306 (Missing Authentication for Critical Function). The Vexa transcription-collector service exposes an internal API endpoint designed for inter-service communication without implementing proper authentication controls. The endpoint GET /internal/transcripts/{meeting_id} was intended for internal use only but is accessible from external networks without credential verification.

The lack of authentication on this critical endpoint creates a direct path for attackers to access sensitive meeting data. Since meeting IDs may follow predictable patterns or be enumerable, an attacker can systematically retrieve transcripts from any meeting stored in the system. This exposes organizations to significant data breach risks, as meeting transcripts often contain sensitive business discussions, strategic planning information, credentials shared during screen-sharing sessions, and personal information of meeting participants.

Root Cause

The root cause of this vulnerability is the absence of authentication and authorization mechanisms on the /internal/transcripts/{meeting_id} endpoint in the transcription-collector service. The endpoint was designed for internal service-to-service communication but lacked proper access controls, allowing any network-accessible client to retrieve transcript data without presenting valid credentials.

Attack Vector

An attacker can exploit this vulnerability remotely over the network without requiring any authentication or user interaction. The attack involves sending HTTP GET requests to the exposed internal endpoint with meeting ID values. The attacker can enumerate meeting IDs through sequential or pattern-based guessing, or by obtaining meeting IDs through other means such as meeting invitations or URL sharing.

The exploitation is straightforward: an attacker simply crafts HTTP requests to the vulnerable endpoint, iterating through potential meeting ID values to retrieve transcript data. Each successful request returns the complete transcript for that meeting, including all spoken content captured during the session.

Detection Methods for CVE-2026-25058

Indicators of Compromise

• Unusual volume of HTTP GET requests to /internal/transcripts/ endpoints from external IP addresses
• Sequential or pattern-based requests to meeting transcript endpoints suggesting enumeration activity
• Access logs showing requests to internal endpoints from non-service IP addresses
• Unexpected data exfiltration patterns involving transcript data

Detection Strategies

• Monitor web server access logs for requests to /internal/transcripts/{meeting_id} from unauthorized sources
• Implement rate limiting detection for rapid sequential requests to transcript endpoints
• Configure network intrusion detection systems to alert on access to internal API paths from external networks
• Review audit logs for bulk transcript access patterns that deviate from normal service behavior

Monitoring Recommendations

• Enable detailed logging on the transcription-collector service to capture all endpoint access attempts
• Configure SIEM rules to correlate transcript endpoint access with IP reputation data
• Implement anomaly detection for transcript retrieval volume and access patterns
• Monitor network traffic for external connections to internal service ports

How to Mitigate CVE-2026-25058

Immediate Actions Required

• Upgrade Vexa to version 0.10.0-260419-1910 or later immediately
• Restrict network access to internal endpoints using firewall rules or network segmentation
• Review access logs to identify potential unauthorized transcript access
• Conduct incident response procedures if unauthorized access is detected

Patch Information

Vexa has released version 0.10.0-260419-1910 which patches this vulnerability by implementing proper authentication controls on the internal transcript endpoint. Organizations should update to this version as soon as possible to remediate the issue. For detailed information about the security fix, refer to the GitHub Security Advisory.

Workarounds

• Implement network-level access controls to prevent external access to internal API endpoints
• Deploy a reverse proxy or API gateway to enforce authentication on all transcript endpoints
• Configure firewall rules to restrict access to the transcription-collector service to trusted internal networks only
• Use network segmentation to isolate internal services from public-facing networks

# Example: Restrict access to internal endpoints using iptables
# Allow only internal network access to the transcription-collector port
iptables -A INPUT -p tcp --dport 8080 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 8080 -s 172.16.0.0/12 -j ACCEPT
iptables -A INPUT -p tcp --dport 8080 -s 192.168.0.0/16 -j ACCEPT
iptables -A INPUT -p tcp --dport 8080 -j DROP