Script execution via undisclosed create-screen input
Published Aug 26, 2021 · Updated Aug 3, 2024
Cross-site scripting in Movable Type create screens allows remote attackers to inject script or HTML through unspecified vectors. Six Apart has not published the affected input field or the code path that renders attacker-controlled data without safe neutralization. A logged-in user must open an affected Entry, Page, or Content Type create screen, after which the script executes in that user's browser context.
Summary
What happened
Cross-site scripting in Movable Type create screens allows remote attackers to inject script or HTML through unspecified vectors. Six Apart has not published the affected input field or the code path that renders attacker-controlled data without safe neutralization. A logged-in user must open an affected Entry, Page, or Content Type create screen, after which the script executes in that user's browser context.
The record
- CVE
- CVE-2021-20809
- Published
- Aug 26, 2021
- Updated
- Aug 3, 2024
- Vendor
- Six Apart Ltd.
- Product
- Movable Type
- Classifications
- CWE-79, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 26, 2021CVE publishedPublication date reported by the CVE source.
- Aug 3, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=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
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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