CVE-2026-21393CWE-79

Movable Type contains a stored cross-site scripting vulnerability in Edit Comment

Medium · published February 4, 2026

CVSS v4.0
4.8
EPSS
0%
Percentile
14.3
In the wild
Unconfirmed
What it is

Movable Type contains a stored cross-site scripting vulnerability in Edit Comment. If crafted input is stored by an attacker, arbitrary script may be executed on a logged-in user's web browser. Note that Movable Type 7 series and 8.4 series, which are End-of-Life (EOL), are affected by the vulnerability as well.

The record
Technical detail
CVSS v4.0
4.8 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
EPSS
0.00241 · 14.3th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-02-04T07:02Z
EPSS history
Timeline
  • 04 FEB 07:02Z
    Movable Type contains a stored cross-site scripting vulnerability in Edit Comment
    cvelistv5