PatchSiren cyber security CVE debrief
CVE-2026-39276 Emlog CVE debrief
A path traversal vulnerability in Emlog Pro v2.6.9 allows authenticated administrators to execute arbitrary PHP code via malicious template uploads. The vulnerability stems from insufficient validation of ZIP archive contents, permitting directory traversal sequences in filenames to overwrite default template files or inject malicious code directly into the active template. This requires high privileges (administrator authentication) but enables complete system compromise through remote code execution. The CVSS 3.1 score of 7.2 (HIGH) reflects the significant impact despite the required authentication. No known exploitation in the wild or ransomware campaign use has been documented. Organizations should restrict template upload permissions and implement file path validation for archive extractions.
- Vendor
- Emlog
- Product
- Emlog Pro
- CVSS
- HIGH 7.2
- CISA KEV
- Not listed in stored evidence
- Original CVE published
- 2026-05-29
- Original CVE updated
- 2026-05-29
- Advisory published
- 2026-05-29
- Advisory updated
- 2026-05-29
Who should care
Organizations running Emlog Pro v2.6.9 with multi-administrator environments; security teams responsible for content management system hardening; hosting providers offering Emlog Pro to customers
Technical summary
The template upload feature in Emlog Pro v2.6.9 fails to properly validate filenames within uploaded ZIP archives. Authenticated administrators can craft malicious archives containing directory traversal sequences (e.g., '../../../') in filenames, causing files to be written outside the intended template directory during extraction. This enables overwriting of default template files or direct inclusion of attacker-controlled PHP code in the current template, resulting in arbitrary code execution with web server privileges. The vulnerability is classified as CWE-22 (Improper Limitation of a Pathname to a Restricted Directory).
Defensive priority
HIGH
Recommended defensive actions
- Restrict template upload functionality to trusted administrators only and implement principle of least privilege
- Validate and sanitize all filenames within uploaded ZIP archives, rejecting paths containing directory traversal sequences (e.g., '../', '..%2f')
- Configure file system permissions to prevent web server write access to sensitive directories outside intended template paths
- Implement content inspection of uploaded archives before extraction, with whitelisting of allowed file types and paths
- Monitor for unexpected file modifications in template directories and establish integrity checking for critical template files
- Review and update to patched versions when available from the vendor; subscribe to vendor security advisories for Emlog Pro
Evidence notes
Vulnerability confirmed through third-party security research report. Vendor identification pending verification—'Emlog' referenced as product name with low confidence due to source domain inference. No official vendor advisory identified in source corpus.
Official resources
2026-05-29