GNUBOARD5 before 5.3.2.0 has XSS that allows remote attackers to inject arbitrary web script or HTML via the "board group extra contents" parameter, aka the adm/boardgroup_form_update.php gr_1~10 parameter.
https://github.com/gnuboard/gnuboard5/releases/tag/5.3.2.0
https://github.com/gnuboard/gnuboard5/compare/15b2e73...2549172
https://github.com/gnuboard/gnuboard5/commit/a45241f4bc46aee1ab2cc0749f6444b043681edf#diff-d87f2c71fb4fe131465ba1ff0a5d573d
Source: Mitre, NVD
Published: 2019-10-30
Updated: 2026-06-17
Base Score: 4.3
Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:N
Severity: Medium
Base Score: 6.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS: 0.00664