CVE-2025-62717 Overview
CVE-2025-62717 is an authentication bypass vulnerability affecting Emlog Pro, an open source website building system. The vulnerability exists in version 2.5.23 due to a session verification code clearing logic error. This flaw allows email verification codes to be reused across multiple verification requests, potentially enabling attackers to bypass authentication controls that rely on single-use verification codes.
Critical Impact
Verification code reuse could allow attackers to bypass email verification mechanisms across the Emlog Pro platform, potentially gaining unauthorized access to password reset, email change, or other verification-protected features.
Affected Products
- Emlog Pro version 2.5.23
Discovery Timeline
- October 24, 2025 - CVE-2025-62717 published to NVD
- October 28, 2025 - Last updated in NVD database
Technical Details for CVE-2025-62717
Vulnerability Analysis
This vulnerability is classified under CWE-287 (Improper Authentication), stemming from flawed session verification code management in Emlog Pro. The core issue lies in the clearing logic for email verification codes, which fails to properly invalidate codes after their first use. In a secure implementation, verification codes should be single-use tokens that are immediately invalidated upon successful verification. However, the vulnerable implementation allows the same code to be submitted multiple times across different verification contexts.
The attack can be executed over the network without requiring authentication or user interaction, though the integrity impact is limited to affecting verification-protected operations rather than providing direct system compromise.
Root Cause
The root cause of CVE-2025-62717 is a logic error in the session verification code clearing mechanism. When a user requests an email verification code (such as for password reset or email change operations), the system generates and stores a verification code. The vulnerability occurs because the code clearing function does not properly remove or invalidate the verification code after it has been successfully used once. This allows the same verification code to be reused across multiple requests anywhere email verification is required.
Attack Vector
The attack vector is network-based and does not require any privileges or user interaction. An attacker could exploit this vulnerability through the following approach:
- Initiate a verification code request through any email verification endpoint
- Obtain a valid verification code (legitimately or through other means)
- Reuse the same verification code across multiple verification requests
- Bypass intended single-use verification controls
The vulnerability manifests in the session verification code clearing logic. When a verification code is submitted, the system validates the code but fails to clear it from the session, allowing subsequent reuse. The fix implemented in commit 1f726df corrects the clearing logic to properly invalidate codes after use. See the GitHub Security Advisory GHSA-wwj4-ppfj-hcm6 for technical details.
Detection Methods for CVE-2025-62717
Indicators of Compromise
- Multiple successful verification attempts using the same verification code within a short time period
- Unusual patterns of verification code usage from the same session or IP address
- Successful verification operations without corresponding fresh code requests
- Anomalous email verification activity targeting multiple accounts or features
Detection Strategies
- Monitor verification endpoint logs for repeated successful submissions with identical verification codes
- Implement rate limiting alerts on verification endpoints to detect abuse patterns
- Review authentication logs for verification code reuse across different user operations
- Correlate verification code generation timestamps with verification submission timestamps to identify stale code usage
Monitoring Recommendations
- Enable detailed logging for all email verification endpoints in Emlog Pro
- Set up alerting for verification code usage patterns that exceed normal single-use behavior
- Monitor for rapid successive verification requests from the same source
- Implement session activity monitoring to detect verification code reuse attempts
How to Mitigate CVE-2025-62717
Immediate Actions Required
- Upgrade Emlog Pro to a version containing commit 1f726df or later
- Review recent verification code usage logs for potential exploitation
- Consider temporarily disabling email verification features if upgrade is not immediately possible
- Audit user accounts for any suspicious email changes or password resets
Patch Information
The vulnerability has been addressed in commit 1f726df0ce56a1bc6e8225dd95389974173bd0c0. Organizations running Emlog Pro version 2.5.23 should update to the latest version that includes this fix. The patch corrects the clearing logic to ensure verification codes are properly invalidated after use.
For more information, refer to the GitHub Commit Update and the GitHub Security Advisory GHSA-wwj4-ppfj-hcm6.
Workarounds
- Implement additional server-side validation to track verification code usage independently
- Add timestamp-based expiration checks for verification codes at the application level
- Consider implementing CAPTCHA or rate limiting on verification endpoints as an additional defense layer
- Monitor and manually review email verification operations until the patch can be applied
# Configuration example - Update Emlog Pro via Git
cd /path/to/emlog
git fetch origin
git checkout 1f726df0ce56a1bc6e8225dd95389974173bd0c0
# Alternatively, pull the latest main branch
git pull origin main
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
