Vulnerability Report

CVE-2021-26929

Title: Horde Groupware Cross-Site Scripting (XSS)

Cross-Site Scripting (XSS)

Proof Of Concept

PoC Available for CVE-2021-26929

CWE Category CWE-79
Published Date Feb 14, 2021
Modified Date Nov 21, 2024
Exploit Status Available
Score 6.1 CVSS v3.1
Exploit Probability (EPSS)
4.94%

Vulnerability Summary

CVE-2021-26929: 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.

Impacted Vendors

H
horde 1
N
nulllogic 1
H
handysoft 1

Reference Links

http://packetstormsecurity.com/files/162187/Webmail-Edition-5.2.22-XSS-Remote-Code-Execution.html http://packetstormsecurity.com/files/162194/Horde-Groupware-Webmail-5.2.22-Cross-Site-Scripting.html https://github.com/horde/webmail/releases https://lists.debian.org/debian-lts-announce/2021/02/msg00028.html https://lists.horde.org/archives/announce/2021/001298.html https://www.alexbirnberg.com/horde-xss.html https://www.horde.org/apps/webmail http://packetstormsecurity.com/files/162187/Webmail-Edition-5.2.22-XSS-Remote-Code-Execution.html http://packetstormsecurity.com/files/162194/Horde-Groupware-Webmail-5.2.22-Cross-Site-Scripting.html https://github.com/horde/webmail/releases https://lists.debian.org/debian-lts-announce/2021/02/msg00028.html https://lists.horde.org/archives/announce/2021/001298.html https://www.alexbirnberg.com/horde-xss.html https://www.horde.org/apps/webmail
CVSS v3.1
Source Entity [email protected]
Severity MEDIUM
6.1
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
REQUIRED
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
CHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS v2.0
Source Entity [email protected]
Severity MEDIUM
4.3
Access Vector
N/A
Authentication
N/A
RAW VECTOR AV:N/AC:M/Au:N/C:N/I:P/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2021-26929 Exploits & PoCs (Proof Of Concept)

Exploit-DB https://www.exploit-db.com/exploits/49769
View Code
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 REQUIRED
CVSS Vector String CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected Stack

No specific products linked.