Medium severity6.1NVD Advisory· Published Aug 26, 2021· Updated Jun 17, 2026
CVE-2021-20813
CVE-2021-20813
Description
Cross-site scripting vulnerability in Edit screen of Content Data of Movable Type (Movable Type 7 r.4903 and earlier (Movable Type 7 Series) and Movable Type Advanced 7 r.4903 and earlier (Movable Type Advanced 7 Series)) 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
5cpe:2.3:a:sixapart:movable_type:*:*:*:*:-:*:*:*+ 2 more
- cpe:2.3:a:sixapart:movable_type:*:*:*:*:-:*:*:*range: >=7.0,<7.8.0
- cpe:2.3:a:sixapart:movable_type:*:*:*:*:advanced:*:*:*range: >=7.0,<7.8.0
- (no CPE)range: <=7 r.4903
- Range: <=7 r.4903
- Six Apart Ltd./Movable Typev5Range: Movable Type 7 r.4903 and earlier (Movable Type 7 Series) and Movable Type Advanced 7 r.4903 and earlier (Movable Type Advanced 7 Series)
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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