CVE-2026-53757 Emlog: Zip Slip Path Traversal in Plugin/Template ZIP Upload Enables RCE
Attackers can exploit a path traversal flaw in Emlog's ZIP extraction to overwrite configuration files and achieve remote code execution.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-53757?
CVE-2026-53757 is a medium-severity path traversal vulnerability in emlog, published on 4 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
Emlog is an open source website building system. In versions 2.6.29 and prior, the emUnZip() function extracts all ZIP entries via ZipArchive::extractTo() without validating entry paths for ../ traversal sequences. Only the first entry's subdirectory structure is checked. An attacker can overwrite arbitrary files on the server filesystem, including config.php for immediate RCE. At time of publication, there are no publicly known patches.
Weakness: CWE-22
Which versions are affected by CVE-2026-53757?
How do I fix CVE-2026-53757?
No fix has been published for CVE-2026-53757 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-53757 being exploited?
There is no known exploitation of CVE-2026-53757 in the wild and no public exploit code.
Sources
Also known as GHSA-gjj4-37r4-mf5g.