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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 that Movable Type 7 series and 8.4 series, which are End-of-Life (EOL), are affected by the vulnerability as well.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:df570e76e638e4d51cabf925c586163267b76c06abe87a06c9049e41614c96da
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
2

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 6 assertions

{"product":"Movable Type (Cloud Edition)","vendor":"Six Apart Ltd.","versions":[{"status":"affected","version":"9.0.5 (9 series)"},{"status":"affected","version":"8.8.1 (8 series)"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:ad42d668d7edbda25830a3dcaffc98fc2ecc8472ea543fbdf544e2e03fcab46b · sha256:6b4d04a0369b0492… · /containers/cna/affected/4

{"product":"Movable Type (Software Edition)","vendor":"Six Apart Ltd.","versions":[{"status":"affected","version":"9.0.4 to 9.0.5 (9.0 series)"},{"status":"affected","version":"8.8.0 to 8.8.1 (8.8 series)"},{"status":"affected","version":"8.0.2 to 8.0.8 (8.0 series)"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:ad42d668d7edbda25830a3dcaffc98fc2ecc8472ea543fbdf544e2e03fcab46b · sha256:6b4d04a0369b0492… · /containers/cna/affected/0

{"product":"Movable Type Advanced (Software Edition)","vendor":"Six Apart Ltd.","versions":[{"status":"affected","version":"9.0.4 to 9.0.5 (9.0 series)"},{"status":"affected","version":"8.8.0 to 8.8.1 (8.8 series)"},{"status":"affected","version":"8.0.2 to 8.0.8 (8.0 series)"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:ad42d668d7edbda25830a3dcaffc98fc2ecc8472ea543fbdf544e2e03fcab46b · sha256:6b4d04a0369b0492… · /containers/cna/affected/1

{"product":"Movable Type Premium (Advanced Edition) (Software Edition)","vendor":"Six Apart Ltd.","versions":[{"status":"affected","version":"9.0.4 (MTP 9.0 series)"},{"status":"affected","version":"2.13 and earlier (MTP 2 series)"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:ad42d668d7edbda25830a3dcaffc98fc2ecc8472ea543fbdf544e2e03fcab46b · sha256:6b4d04a0369b0492… · /containers/cna/affected/3

{"product":"Movable Type Premium (Cloud Edition)","vendor":"Six Apart Ltd.","versions":[{"status":"affected","version":"9.0.5 (9 series)"},{"status":"affected","version":"2.12 (MTP 2 series)"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:ad42d668d7edbda25830a3dcaffc98fc2ecc8472ea543fbdf544e2e03fcab46b · sha256:6b4d04a0369b0492… · /containers/cna/affected/5

{"product":"Movable Type Premium (Software Edition)","vendor":"Six Apart Ltd.","versions":[{"status":"affected","version":"9.0.4 (MTP 9.0 series)"},{"status":"affected","version":"2.13 and earlier (MTP 2 series)"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:ad42d668d7edbda25830a3dcaffc98fc2ecc8472ea543fbdf544e2e03fcab46b · sha256:6b4d04a0369b0492… · /containers/cna/affected/2
cvss · 2 assertions

{"metric":{"baseScore":4.8,"baseSeverity":"MEDIUM","vectorString":"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","version":"4.0"},"metric_type":"cvssV4_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:ad42d668d7edbda25830a3dcaffc98fc2ecc8472ea543fbdf544e2e03fcab46b · sha256:6b4d04a0369b0492… · /containers/cna/metrics/1/cvssV4_0

{"metric":{"baseScore":5.4,"baseSeverity":"MEDIUM","vectorString":"CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","version":"3.0"},"metric_type":"cvssV3_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:ad42d668d7edbda25830a3dcaffc98fc2ecc8472ea543fbdf544e2e03fcab46b · sha256:6b4d04a0369b0492… · /containers/cna/metrics/0/cvssV3_0

Affected products and versions

6 source assertions
{"product":"Movable Type (Cloud Edition)","vendor":"Six Apart Ltd.","versions":[{"status":"affected","version":"9.0.5 (9 series)"},{"status":"affected","version":"8.8.1 (8 series)"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:ad42d668d7edbda25830a3dcaffc98fc2ecc8472ea543fbdf544e2e03fcab46b · sha256:6b4d04a0369b0492… · /containers/cna/affected/4
{"product":"Movable Type (Software Edition)","vendor":"Six Apart Ltd.","versions":[{"status":"affected","version":"9.0.4 to 9.0.5 (9.0 series)"},{"status":"affected","version":"8.8.0 to 8.8.1 (8.8 series)"},{"status":"affected","version":"8.0.2 to 8.0.8 (8.0 series)"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:ad42d668d7edbda25830a3dcaffc98fc2ecc8472ea543fbdf544e2e03fcab46b · sha256:6b4d04a0369b0492… · /containers/cna/affected/0
{"product":"Movable Type Advanced (Software Edition)","vendor":"Six Apart Ltd.","versions":[{"status":"affected","version":"9.0.4 to 9.0.5 (9.0 series)"},{"status":"affected","version":"8.8.0 to 8.8.1 (8.8 series)"},{"status":"affected","version":"8.0.2 to 8.0.8 (8.0 series)"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:ad42d668d7edbda25830a3dcaffc98fc2ecc8472ea543fbdf544e2e03fcab46b · sha256:6b4d04a0369b0492… · /containers/cna/affected/1
{"product":"Movable Type Premium (Advanced Edition) (Software Edition)","vendor":"Six Apart Ltd.","versions":[{"status":"affected","version":"9.0.4 (MTP 9.0 series)"},{"status":"affected","version":"2.13 and earlier (MTP 2 series)"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:ad42d668d7edbda25830a3dcaffc98fc2ecc8472ea543fbdf544e2e03fcab46b · sha256:6b4d04a0369b0492… · /containers/cna/affected/3
{"product":"Movable Type Premium (Cloud Edition)","vendor":"Six Apart Ltd.","versions":[{"status":"affected","version":"9.0.5 (9 series)"},{"status":"affected","version":"2.12 (MTP 2 series)"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:ad42d668d7edbda25830a3dcaffc98fc2ecc8472ea543fbdf544e2e03fcab46b · sha256:6b4d04a0369b0492… · /containers/cna/affected/5
{"product":"Movable Type Premium (Software Edition)","vendor":"Six Apart Ltd.","versions":[{"status":"affected","version":"9.0.4 (MTP 9.0 series)"},{"status":"affected","version":"2.13 and earlier (MTP 2 series)"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:ad42d668d7edbda25830a3dcaffc98fc2ecc8472ea543fbdf544e2e03fcab46b · sha256:6b4d04a0369b0492… · /containers/cna/affected/2

Provider-owned CVSS observations

2 source assertions
{"metric":{"baseScore":4.8,"baseSeverity":"MEDIUM","vectorString":"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","version":"4.0"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:ad42d668d7edbda25830a3dcaffc98fc2ecc8472ea543fbdf544e2e03fcab46b · sha256:6b4d04a0369b0492… · /containers/cna/metrics/1/cvssV4_0
{"metric":{"baseScore":5.4,"baseSeverity":"MEDIUM","vectorString":"CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","version":"3.0"},"metric_type":"cvssV3_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:ad42d668d7edbda25830a3dcaffc98fc2ecc8472ea543fbdf544e2e03fcab46b · sha256:6b4d04a0369b0492… · /containers/cna/metrics/0/cvssV3_0

CWE assertions

1 source assertion
{"cweId":"CWE-79","description":"Cross-site scripting (XSS)","lang":"en-US","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:ad42d668d7edbda25830a3dcaffc98fc2ecc8472ea543fbdf544e2e03fcab46b · sha256:6b4d04a0369b0492… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"url":"https://jvn.jp/en/jp/JVN45405689/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:ad42d668d7edbda25830a3dcaffc98fc2ecc8472ea543fbdf544e2e03fcab46b · sha256:6b4d04a0369b0492… · /containers/cna/references/2
{"url":"https://movabletype.org/news/2026/02/mt-906-released.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:ad42d668d7edbda25830a3dcaffc98fc2ecc8472ea543fbdf544e2e03fcab46b · sha256:6b4d04a0369b0492… · /containers/cna/references/0
{"url":"https://www.sixapart.jp/movabletype/news/2026/02/04-1100.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:ad42d668d7edbda25830a3dcaffc98fc2ecc8472ea543fbdf544e2e03fcab46b · sha256:6b4d04a0369b0492… · /containers/cna/references/1

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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