CVE-2021-26929 is a medium-severity cross-site scripting (XSS) vulnerability affecting Horde Groupware Webmail Edition through version 5.2.22, specifically when using the Horde_Text_Filter library before 2.3.7. An attacker can exploit this by sending a specially crafted plain text email containing JavaScript, which is improperly handled by the Text2html.php component due to flawed XSS defenses. The vulnerability has a CVSS score of 6.1, indicating it can be exploited over the network with low attack complexity, requiring user interaction, and potentially leading to low confidentiality and integrity impacts. While there is no evidence of active exploitation or Metasploit/Nuclei modules, a public exploit (EDB-49769) exists, though community discussion and media coverage are minimal.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
<= 5.2.22CPE matchmatch criteria | cpe:2.3:a:horde:groupware:*:*:*:*:webmail:*:*:* | ||
9.0CPE matchmatch criteria | cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Remediation records are not available for this CVE.