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CVE-2021-26929 Details

Description

An XSS issue was discovered in Horde Groupware Webmail Edition through 5.2.22 (where the Horde_Text_Filter library before 2.3.7 is used). The attacker can send a plain text e-mail message, with JavaScript encoded as a link or email that is mishandled by preProcess in Text2html.php, because bespoke use of \x00\x00\x00 and \x01\x01\x01 interferes with XSS defenses.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:6.1 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.

URL	Source(s)	Tag(s)
http://packetstormsecurity.com/files/162187/Webmail-Edition-5.2.22-XSS-Remote-Code-Execution.html	CVE	ExploitThird Party AdvisoryVDB Entry
http://packetstormsecurity.com/files/162194/Horde-Groupware-Webmail-5.2.22-Cross-Site-Scripting.html	CVE	Third Party Advisory
https://github.com/horde/webmail/releases	CVE	Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/02/msg00028.html	CVE	Mailing ListThird Party Advisory
https://lists.horde.org/archives/announce/2021/001298.html	CVE	Mailing ListVendor Advisory
https://www.alexbirnberg.com/horde-xss.html	CVE	ExploitThird Party Advisory
https://www.horde.org/apps/webmail	CVE	Vendor Advisory
http://packetstormsecurity.com/files/162187/Webmail-Edition-5.2.22-XSS-Remote-Code-Execution.html	[email protected]	ExploitThird Party AdvisoryVDB Entry
http://packetstormsecurity.com/files/162194/Horde-Groupware-Webmail-5.2.22-Cross-Site-Scripting.html	[email protected]	Third Party Advisory
https://github.com/horde/webmail/releases	[email protected]	Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/02/msg00028.html	[email protected]	Mailing ListThird Party Advisory
https://lists.horde.org/archives/announce/2021/001298.html	[email protected]	Mailing ListVendor Advisory
https://www.alexbirnberg.com/horde-xss.html	[email protected]	ExploitThird Party Advisory
https://www.horde.org/apps/webmail	[email protected]	Vendor Advisory

see all 14 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-79	Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')	[email protected]

Affected Products

Product	Versions
horde groupware	<= 5.2.22
CPE cpe:2.3:a:horde:groupware:::::webmail:::* Remediation No remediation found in references.
debian debian linux	9.0
CPE cpe:2.3:o:debian:debian_linux:9.0:::::::* Remediation No remediation found in references.

Change History

9 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Nov 21, 2024	CVE Modified	CVE
May 14, 2024	CVE Modified	[email protected]
Apr 19, 2021	Modified Analysis	[email protected]
Apr 15, 2021	CVE Modified	[email protected]
Apr 14, 2021	CVE Modified	[email protected]
Feb 23, 2021	Modified Analysis	[email protected]
Feb 19, 2021	CVE Modified	[email protected]
Feb 18, 2021	Initial Analysis	[email protected]