CVE-2026-22799
emlog Arbitrary File Upload Vulnerability
Description
Emlog is an open source website building system. emlog v2.6.1 and earlier exposes a REST API endpoint (/index.php?rest-api=upload) for media file uploads. The endpoint fails to implement proper validation of file types, extensions, and content, allowing authenticated attackers (with a valid API key or admin session cookie) to upload arbitrary files (including malicious PHP scripts) to the server. An attacker can obtain the API key either by gaining administrator access to enable the REST API setting, or via information disclosure vulnerabilities in the application. Once uploaded, the malicious PHP file can be executed to gain remote code execution (RCE) on the target server, leading to full server compromise.
INFO
Published Date :
Jan. 12, 2026, 10:16 p.m.
Last Modified :
Jan. 21, 2026, 7:13 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | CRITICAL | [email protected] |
Solution
- Update Emlog to a secure version.
- Remove any uploaded malicious files.
- Restrict API access to authorized users.
- Implement strict file type validation.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-22799.
| URL | Resource |
|---|---|
| https://github.com/emlog/emlog/commit/429b02fda842254b9b9b39303e9161999c180560 | Patch |
| https://github.com/emlog/emlog/security/advisories/GHSA-p837-mrw9-5x5j | Exploit Vendor Advisory |
| https://github.com/emlog/emlog/security/advisories/GHSA-p837-mrw9-5x5j | Exploit Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-22799 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-22799
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-22799 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-22799 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jan. 21, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Added CPE Configuration OR *cpe:2.3:a:emlog:emlog:*:*:*:*:pro:*:*:* versions up to (excluding) 2.6.1 Added Reference Type GitHub, Inc.: https://github.com/emlog/emlog/commit/429b02fda842254b9b9b39303e9161999c180560 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/emlog/emlog/security/advisories/GHSA-p837-mrw9-5x5j Types: Exploit, Vendor Advisory Added Reference Type CISA-ADP: https://github.com/emlog/emlog/security/advisories/GHSA-p837-mrw9-5x5j Types: Exploit, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jan. 13, 2026
Action Type Old Value New Value Added Reference https://github.com/emlog/emlog/security/advisories/GHSA-p837-mrw9-5x5j -
New CVE Received by [email protected]
Jan. 12, 2026
Action Type Old Value New Value Added Description Emlog is an open source website building system. emlog v2.6.1 and earlier exposes a REST API endpoint (/index.php?rest-api=upload) for media file uploads. The endpoint fails to implement proper validation of file types, extensions, and content, allowing authenticated attackers (with a valid API key or admin session cookie) to upload arbitrary files (including malicious PHP scripts) to the server. An attacker can obtain the API key either by gaining administrator access to enable the REST API setting, or via information disclosure vulnerabilities in the application. Once uploaded, the malicious PHP file can be executed to gain remote code execution (RCE) on the target server, leading to full server compromise. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-434 Added Reference https://github.com/emlog/emlog/commit/429b02fda842254b9b9b39303e9161999c180560 Added Reference https://github.com/emlog/emlog/security/advisories/GHSA-p837-mrw9-5x5j