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CVE-2026-40187

HIGH Exploitation: PoC
8.6
CVSS 4.0
Description
In egroupware version 26.0 and earlier, an authenticated administrator can achieve OS-level Remote Code Execution (RCE) by uploading a malicious eTemplate XML file (`.xet`) to the VFS `/etemplates` mount. The `Widget::expand_name()` method passes template widget attribute values directly into a PHP `eval()` call with only double-quote escaping applied - **backtick characters are not escaped**. In PHP, backticks inside a double-quoted `eval()` string execute shell commands. This allows an admin-level user to escalate from web application access to arbitrary OS command execution on the server.

Metadata

CVE ID
CVE-2026-40187
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-04-09 20:59 UTC
Published
2026-07-20 17:00 UTC
Last updated
2026-07-20 17:34 UTC
Primary CWE
CWE-78
CWE-78: Improper Neutralization of Special Elements used in …
Vendor / Product
EGroupware / egroupware
Sources
cve.org  ·  NVD

Severity & Metrics

8.6 HIGH CVSS 4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SSVC — CISA Coordinator
Exploitation
PoC
Automatable
no
Tech. Impact
total
Affected products (1)
VendorProductPlatformVersions
EGroupware egroupware — <= 26.0
Weakness (CWE)
CWESourceDescription
CWE-78 cna CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-95 cna CWE-95: Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')
CVSS scores (1)
ScoreSeverityVersionSourceVector
8.6 HIGH 4.0 cna CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
References (1)
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