Vulnerability Report

CVE-2020-8866

RCE

Title: Arbitrary file creation in Horde Groupware Webmail Edition

RCE

Proof Of Concept

PoC Available for CVE-2020-8866

CWE Category CWE-434
Published Date Mar 23, 2020
Modified Date Jun 17, 2026
Exploit Status Available
Score 6.5 CVSS v3.1
Exploit Probability (EPSS)
9.58%

Vulnerability Summary

CVE-2020-8866: This vulnerability allows remote attackers to create arbitrary files on affected installations of Horde Groupware Webmail Edition 5.2.22. Authentication is required to exploit this vulnerability. The specific flaw exists within add.php. The issue results from the lack of proper validation of user-supplied data, which can allow the upload of arbitrary files. An attacker can leverage this in conjunction with other vulnerabilities to execute code in the context of the www-data user. Was ZDI-CAN-10125.

Impacted Vendors

H
horde 2
N
nulllogic 1
H
handysoft 1

Reference Links

https://lists.debian.org/debian-lts-announce/2020/03/msg00036.html https://lists.horde.org/archives/announce/2020/001288.html https://www.zerodayinitiative.com/advisories/ZDI-20-275/ https://lists.debian.org/debian-lts-announce/2020/03/msg00036.html https://lists.horde.org/archives/announce/2020/001288.html https://www.zerodayinitiative.com/advisories/ZDI-20-275/
CVSS v3.1
Source Entity [email protected]
Severity MEDIUM
6.5
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
CVSS v3.0
Source Entity [email protected]
Severity MEDIUM
4.3
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
CVSS v2.0
Source Entity [email protected]
Severity MEDIUM
4.0
Access Vector
N/A
Authentication
N/A
RAW VECTOR AV:N/AC:L/Au:S/C:N/I:P/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2020-8866 Exploits & PoCs (Proof Of Concept)

Exploit-DB https://www.exploit-db.com/exploits/48210
View Code
Exploit-DB https://www.exploit-db.com/exploits/48209
View Code
MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data or affected products updated.

PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector NETWORK
Complexity LOW
Privileges N/A
Interaction NONE
CVSS Vector String CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Affected Stack

No specific products linked.