01 Record
CVE-2026-21393
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
MediumPUBLISHEDCNA: jpcert
CNA base score4.8 CVSS v4.0CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
02 Description
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
03 Exploitation and scoring
- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
- Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
- EPSS probability
- 0.24% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 15.0% of scored records. A rank, not a probability.
- NVD base score
- 4.8 (CVSS v4.0), scored by the NVD independently of the CNA.
- NVD CVSS 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- NVD analysis status
- Deferred. NVD last modified this record on 2026-06-17.
- Red Hat severity
- No Red Hat rating. Red Hat rates the CVEs that affect its products.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2026-02-04 07:02Z8 MO AGO
- Last updated
- 2026-02-04 16:08Z8 MO AGO
- Reserved
- 2026-01-29
- Assigning CNA
- jpcert
- Record state
- PUBLISHED
- Severity
- Medium (CVSS 4.8)
- CNA CVSS 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
- Weaknesses
- CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')Base
- Data version
- 5.2
- Document digest
- 6b4d04a0369b0492bc98b1c31ed4a08f98cacf5cdc13f6eec3fa1252191014f1
05 Affected products
VendorProductVersionsPlatforms
Six Apart Ltd.Movable Type (Software Edition)9.0.4 to 9.0.5 (9.0 series), 8.8.0 to 8.8.1 (8.8 series), 8.0.2 to 8.0.8 (8.0 series)—
Six Apart Ltd.Movable Type Advanced (Software Edition)9.0.4 to 9.0.5 (9.0 series), 8.8.0 to 8.8.1 (8.8 series), 8.0.2 to 8.0.8 (8.0 series)—
Six Apart Ltd.Movable Type Premium (Software Edition)9.0.4 (MTP 9.0 series), 2.13 and earlier (MTP 2 series)—
Six Apart Ltd.Movable Type Premium (Advanced Edition) (Software Edition)9.0.4 (MTP 9.0 series), 2.13 and earlier (MTP 2 series)—