CVE-2025-54856

Severity: medium (CVSS 4.6 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-10-23 · updated 2026-06-17
Weakness: CWE-79

Description

Movable Type contains a stored cross-site scripting vulnerability in Edit ContentData page. If crafted input is stored by an attacker with "ContentType Management" privilege, an arbitrary script may be executed on the web browser of the user who accesses Edit ContentData page.

Affected products

Six Apart Ltd. Movable Type Advanced (Software Edition): from 8.4.0 through 8.4.3 (8.4 series); from 8.0.0 through 8.0.7 (8.0 series); 7 r.5509 and earlier (7 series)
Six Apart Ltd. Movable Type (Cloud Edition): 8.7.0 (8 series), 7 r.5509 (7 series)
Six Apart Ltd. Movable Type Premium (Advanced Edition) (Software Edition): 2.10 and earlier (2 series), 1.67 and earlier (1 series)
Six Apart Ltd. Movable Type Premium (Cloud Edition): 2.10 (2 series), 1.67 (1 series)
Six Apart Ltd. Movable Type Premium (Software Edition): 2.10 and earlier (2 series), 1.67 and earlier (1 series)
Six Apart Ltd. Movable Type (Software Edition): from 8.4.0 through 8.4.3 (8.4 series); from 8.0.0 through 8.0.7 (8.0 series); 7 r.5509 and earlier (7 series)

References

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