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Vulnerability record · CVE-2020-8866 · published 23 March 2020

CVE-2020-8866: Horde groupware unrestricted file upload vulnerability

Horde · Groupware

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.

6.5 CVSS 3.1 Medium EPSS 9.6% · top 4.7% CWE-434 · Unrestricted file upload
6.5CVSS 3.1 base score, v2 4.0
9.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

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.

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

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://lists.debian.org/debian-lts-announce/2020/03/msg00036.html Mailing ListThird Party Advisory
https://lists.horde.org/archives/announce/2020/001288.html Mailing ListVendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-20-275/ Third Party AdvisoryVDB Entry
https://lists.debian.org/debian-lts-announce/2020/03/msg00036.html Mailing ListThird Party Advisory
https://lists.horde.org/archives/announce/2020/001288.html Mailing ListVendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-20-275/ Third Party AdvisoryVDB Entry

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Source: NIST National Vulnerability Database (record CVE-2020-8866), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.