CVE-2021-26929
CVE-2021-26929
Vexday Risk Score
23Low
SSVC decision (CISA)
Attend
PoC available → attend closely
Exploit maturity
Proof of concept
Public proof of concept exists, but not yet automated.
CVSS —EPSS 4.9%KEV nãoPoC públicaNuclei —Metasploit —Patch —
Lifecycle
14 Feb 2021Published on NVD
15 Apr 2021Public PoC
Weaponization speed
60 daysto first PoC
Recommendation: Plan a near-term fix — a public PoC already exists.
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.
Affected products
n/a · n/apublic PoCs found — 3
cve_referencepacketstormsecurity.com/files/162187/Webmail-Edition-5.2.22-XSS-Remote-Code-Execution.htmlunverifiedcve_referencepacketstormsecurity.com/files/162194/Horde-Groupware-Webmail-5.2.22-Cross-Site-Scripting.htmlunverifiedexploitdbwww.exploit-db.com/exploits/49769unverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
References
http://packetstormsecurity.com/files/162187/Webmail-Edition-5.2.22-XSS-Remote-Code-Execution.htmlhttp://packetstormsecurity.com/files/162194/Horde-Groupware-Webmail-5.2.22-Cross-Site-Scripting.htmlhttps://github.com/horde/webmail/releaseshttps://lists.debian.org/debian-lts-announce/2021/02/msg00028.htmlhttps://lists.horde.org/archives/announce/2021/001298.htmlhttps://www.alexbirnberg.com/horde-xss.htmlhttps://www.horde.org/apps/webmail