CVE-2020-8866

Name: CVE-2020-8866
Creator: NVD / NIST
Published: 2020-03-23T21:15:12.643+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 9.58%

Last modified Jun 17, 2026

CVE-2020-8866 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 9.58% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

EPSS Probability

9.58%

94.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Horde	Groupware	5.2.22
Horde	Horde Form	< 2.0.20
Debian	Debian Linux	8.0

References

https://lists.debian.org/debian-lts-announce/2020/03/msg00036.htmlMailing List, Third Party Advisory
https://lists.horde.org/archives/announce/2020/001288.htmlMailing List, Vendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-20-275/Third Party Advisory, VDB Entry
https://lists.debian.org/debian-lts-announce/2020/03/msg00036.htmlMailing List, Third Party Advisory
https://lists.horde.org/archives/announce/2020/001288.htmlMailing List, Vendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-20-275/Third Party Advisory, VDB Entry

Timeline

Published: Mar 23, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-8866?

How severe is CVE-2020-8866?

CVE-2020-8866 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 9.58% probability of exploitation in the next 30 days.

How do I fix CVE-2020-8866?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-8866?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST