THREATPORT/VULNERABILITY/CVE-2021-26929
MEDIUM SEVERITY

CVE-2021-26929

Groupware vulnerability

CVSS
6.1
EPSS
4.9%
EPSS pct
91th
Exploited
No known
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 vendor
Horde
Affected product
Groupware
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness type (CWE)
  • CWE-79 — Cross-Site Scripting (XSS)
Published
2021-02-14

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, user interaction. Successful exploitation leads to low impact to confidentiality, low impact to integrity.

Its EPSS score of 4.9% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 91% of all scored CVEs.

Check your external exposure to CVE-2021-26929

  • Confirm whether Horde Groupware is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2021-26929.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2021-26929

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2021-26929 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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