SARA / Free Tools / CVE / CVE-2017-16906

CVE-2017-16906 — In Horde Groupware 5

In Horde Groupware 5.2.19-5.2.22, there is XSS via the URL field in a "Calendar -> New Event" action.

CVSS

5.4 MEDIUM

EPSS

0.25% (top 51.90%)

CWE

—

Published

2017-11-20T20:29:00.340

Last modified

2026-05-13T00:24:29.033

CVSS vector

CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

01What is this vulnerability?

In Horde Groupware 5.2.19-5.2.22, there is XSS via the URL field in a "Calendar -> New Event" action.

No structured affected-product list available — see references below for vendor advisories.

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

Patch to a fixed version listed in the vendor advisory (see references below).
Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
Hunt historical logs for exploitation indicators — see Detection signatures below.

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

code610.blogspot.com — http://code610.blogspot.com/2017/11/rce-via-xss-horde-5219.html
github.com — https://github.com/horde/kronolith/commit/09d90141292f9ec516a7a2007bf828ce2bbdf6…
github.com — https://github.com/starnightcyber/Miscellaneous/blob/master/Horde/README.md
lists.debian.org — https://lists.debian.org/debian-lts-announce/2020/08/msg00049.html
code610.blogspot.com — http://code610.blogspot.com/2017/11/rce-via-xss-horde-5219.html
github.com — https://github.com/horde/kronolith/commit/09d90141292f9ec516a7a2007bf828ce2bbdf6…
github.com — https://github.com/starnightcyber/Miscellaneous/blob/master/Horde/README.md
lists.debian.org — https://lists.debian.org/debian-lts-announce/2020/08/msg00049.html

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