Critical severity9.8NVD Advisory· Published Oct 26, 2021· Updated Jun 17, 2026
CVE-2021-20837
CVE-2021-20837
Description
Movable Type 7 r.5002 and earlier (Movable Type 7 Series), Movable Type 6.8.2 and earlier (Movable Type 6 Series), Movable Type Advanced 7 r.5002 and earlier (Movable Type Advanced 7 Series), Movable Type Advanced 6.8.2 and earlier (Movable Type Advanced 6 Series), Movable Type Premium 1.46 and earlier, and Movable Type Premium Advanced 1.46 and earlier allow remote attackers to execute arbitrary OS commands via unspecified vectors. Note that all versions of Movable Type 4.0 or later including unsupported (End-of-Life, EOL) versions are also affected by this vulnerability.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
4- Range: <=1.46
- Range: <=7 r.5002, <=6.8.2, <=1.46
- Range: <=7 r.5002, <=6.8.2, <=1.46
- Six Apart Ltd./Movable Typev5Range: Movable Type 7 r.5002 and earlier (Movable Type 7 Series), Movable Type 6.8.2 and earlier (Movable Type 6 Series), Movable Type Advanced 7 r.5002 and earlier (Movable Type Advanced 7 Series), Movable Type Advanced 6.8.2 and earlier (Movable Type Advanced 6 Series), Movable Type Premium 1.46 and earlier, and Movable Type Premium Advanced 1.46 and earlier
Patches
Vulnerability mechanics
References
4- packetstormsecurity.com/files/164705/Movable-Type-7-r.5002-XMLRPC-API-Remote-Command-Injection.htmlnvdExploitThird Party AdvisoryVDB Entry
- packetstormsecurity.com/files/164818/Movable-Type-7-r.5002-XMLRPC-API-Remote-Command-Injection.htmlnvdThird Party AdvisoryVDB Entry
- jvn.jp/en/jp/JVN41119755/index.htmlnvdThird Party Advisory
- movabletype.org/news/2021/10/mt-782-683-released.htmlnvdRelease NotesVendor Advisory
News mentions
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