Vulnerability Details : 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.
Vulnerability category: Cross site scripting (XSS)
Products affected by CVE-2021-26929
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
- cpe:2.3:a:horde:groupware:*:*:*:*:webmail:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-26929
3.04%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 91 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-26929
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
4.3
|
MEDIUM | AV:N/AC:M/Au:N/C:N/I:P/A:N |
8.6
|
2.9
|
NIST | |
6.1
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
2.8
|
2.7
|
NIST |
CWE ids for CVE-2021-26929
-
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-26929
-
https://www.alexbirnberg.com/horde-xss.html
[CVE-2021-26929] Horde Groupware Webmail Edition 5.2.22 - Stored XSS in received emailsExploit;Third Party Advisory
-
http://packetstormsecurity.com/files/162194/Horde-Groupware-Webmail-5.2.22-Cross-Site-Scripting.html
Horde Groupware Webmail 5.2.22 Cross Site Scripting ≈ Packet StormThird Party Advisory
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https://www.horde.org/apps/webmail
Webmail - The Horde ProjectVendor Advisory
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http://packetstormsecurity.com/files/162187/Webmail-Edition-5.2.22-XSS-Remote-Code-Execution.html
Webmail Edition 5.2.22 XSS / Remote Code Execution ≈ Packet StormExploit;Third Party Advisory;VDB Entry
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https://lists.horde.org/archives/announce/2021/001298.html
[announce] [SECURITY] CVE 2021-26929: XSS vulnerability in Horde_Text_FilterMailing List;Vendor Advisory
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https://lists.debian.org/debian-lts-announce/2021/02/msg00028.html
[SECURITY] [DLA 2564-1] php-horde-text-filter security updateMailing List;Third Party Advisory
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https://github.com/horde/webmail/releases
Releases · horde/webmail · GitHubThird Party Advisory
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