Home/CVE/An XSS issue was discovered in Horde Groupware Webmail Edition through 5.2.22 (where the Horde_Text_Filter library befor
CVE

CVE-2021-26929

An XSS issue was discovered in Horde Groupware Webmail Edition through 5.2.22 (where the Horde_Text_Filter library befor

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.

MEDIUM · CVSS 6.1 EPSS 0.01518
Schedule remediation
  • Public exploit or PoC is available
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
▤

Affected Products & Versions

2
horde groupware<= 5.2.22
debian linuxall versions
⚠

Public Exploits & PoCs

4
webappsHorde Groupware Webmail 5.2.22 - Stored XSS2021-04-15
pocpacketstormsecurity.com · Webmail-Edition-5.2.22-XSS-Remote-Code-Execution.htmlpacketstormsecurity.com
pocpacketstormsecurity.com · Horde-Groupware-Webmail-5.2.22-Cross-Site-Scripting.htmlpacketstormsecurity.com
pocwww.alexbirnberg.com · horde-xss.htmlwww.alexbirnberg.com
▣

Scoring & Timeline

6.1
MEDIUM · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD14 Feb 2021 · 04:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
🔗

References & Sources

4
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/horde/webmail/releasesThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/02/msg00028.htmlMailing ListThird Party Advisory
https://lists.horde.org/archives/announce/2021/001298.htmlMailing ListVendor Advisory
https://www.horde.org/apps/webmailVendor Advisory
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