This vulnerability allows remote attackers to create arbitrary files on affected installations of Horde Groupware Webmail Edition 5.2.22.

published 2020-03-23 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-29708

cvss: 4.3; version 3.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 9.6%; EPSS 9.6% chance of exploitation in 30 days, percentile 95%
public exploits: 2; Exploit-DB

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.

Patch / fix

fixed in 1 distros 1

horde horde_form 2.0.20

php-horde-form Debian 12 2.0.20-1

debian advisories DEBIAN-CVE-2020-8866

Timeline

2020-03-11 First public exploit (EDB-48210)
2020-03-23 Published

Exploit prediction

9.58% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

EDB-48210 Horde Groupware Webmail Edition 5.2.22 - PHAR Loading webapps, 2020-03-11
EDB-48209 Horde Groupware Webmail Edition 5.2.22 - PHP File Inclusion webapps, 2020-03-11

CVSS scores

assigned by	version	score	vector
CNA	3.0	4.3	CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
NVD	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
NVD	2.0	4.0	AV:N/AC:L/Au:S/C:N/I:P/A:N

Affected products

Horde Groupware Webmail Edition

Classification

Weakness

CWE-434 Unrestricted Upload of File with Dangerous Type

References

lists.horde.org /archives/announce/2020/001288.html
mailing-list, vendor-advisory
zerodayinitiative.com /advisories/ZDI-20-275/
third-party-advisory, vdb-entry
lists.debian.org /debian-lts-announce/2020/03/msg00036.html
mailing-list, third-party-advisory

Sources

CVE List CVE-2020-8866
NVD CVE-2020-8866

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary