Medium severity6.1NVD Advisory· Published Aug 26, 2021· Updated Jun 17, 2026
CVE-2021-20810
CVE-2021-20810
Description
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
8cpe:2.3:a:sixapart:movable_type:*:*:*:*:-:*:*:*+ 4 more
- cpe:2.3:a:sixapart:movable_type:*:*:*:*:-:*:*:*range: >=6.0,<=6.8.0
- cpe:2.3:a:sixapart:movable_type:*:*:*:*:advanced:*:*:*range: >=7.0,<7.8.0
- cpe:2.3:a:sixapart:movable_type:*:*:*:*:premium:*:*:*range: <=1.44
- cpe:2.3:a:sixapart:movable_type:*:*:*:*:premium_advanced:*:*:*range: <=1.44
- (no CPE)range: <=7 r.4903, <=6.8.0, <=7 r.4903, <=1.44, <=1.44
- Range: <=1.44
- Range: <=7 r.4903, <=1.44
- Six Apart Ltd./Movable Typev5Range: 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
Patches
Vulnerability mechanics
References
2- jvn.jp/en/jp/JVN97545738/index.htmlnvdThird Party Advisory
- movabletype.org/news/2021/08/mt-780-681-released.htmlnvdRelease NotesVendor Advisory
News mentions
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