CVE-2021-20810 json
Cross-site scripting vulnerability in Website Management screen of Movable Type (Movable Type 7 r.4903 and earlier (Movable Type 7 Series),…
published 2021-08-26 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-8222
- cvss
- 6.1
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.9%
- EPSS 0.9% chance of exploitation in 30 days, percentile 60%
- public exploits
- 0
- none known
Summary
Cross-site scripting vulnerability in Website Management screen of Movable Type (Movable Type 7 r.4903 and earlier (Movable Type 7 Series), Movable Type 6.8.0 and earlier (Movable Type 6 Series), Movable Type Advanced 7 r.4903 and earlier (Movable Type Advanced 7 Series), Movable Type Premium 1.44 and earlier, and Movable Type Premium Advanced 1.44 and earlier) allows remote attackers to inject arbitrary script or HTML via unspecified vectors.
Patch / fix
- sixapart movable_type 7.8.0
Exploit prediction
0.90% chance of exploitation in the next 30 days, higher than 60% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:N/I:P/A:N |
Affected products
- Six Apart Ltd. Movable Type
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
movabletype.org
/news/2021/08/mt-780-681-released.html
release-notes, vendor-advisory
-
jvn.jp
/en/jp/JVN97545738/index.html
third-party-advisory
Sources
- CVE List CVE-2021-20810
- NVD CVE-2021-20810
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