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Medium severity6.1NVD Advisory· Published Aug 26, 2021· Updated Jun 17, 2026

CVE-2021-20809

CVE-2021-20809

Description

Cross-site scripting vulnerability in Create screens of Entry, Page, and Content Type 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

8
  • Movabletype/Movabletype5 versions
    cpe: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)
  • Movabletype/Movable Type Premiumllm-fuzzy
  • Movabletype/Movable Type Advancedllm-fuzzy
  • Six Apart Ltd./Movable Typev5
    Range: 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

News mentions

0

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