Browser script execution via Role authority screen
Published Mar 5, 2021 · Updated Aug 3, 2024
Cross-site scripting in Six Apart Movable Type 7 r.4705 and earlier allows remote attackers to execute script in a logged-in user's browser. JVN identifies the Role authority setting screen but does not disclose the affected parameter, code path, or faulty encoding operation. Exploitation requires a logged-in user to load the affected screen; the script can read or alter data available to that browser session, with no availability impact reported.
Summary
What happened
Cross-site scripting in Six Apart Movable Type 7 r.4705 and earlier allows remote attackers to execute script in a logged-in user's browser. JVN identifies the Role authority setting screen but does not disclose the affected parameter, code path, or faulty encoding operation. Exploitation requires a logged-in user to load the affected screen; the script can read or alter data available to that browser session, with no availability impact reported.
The record
- CVE
- CVE-2021-20663
- Published
- Mar 5, 2021
- Updated
- Aug 3, 2024
- Vendor
- Six Apart Ltd.
- Product
- Movable Type
- Classifications
- CWE-79, T1059.007
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 5, 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.4705 and earlier (Movable Type 7 Series), Movable Type Advanced 7 r.4705 and earlier (Movable Type Advanced 7 Series), Movable Type 6.7.5 and earlier (Movable Type 6.7 Series), Movable Type Premium 1.39 and earlier, and Movable Type Premium Advanced 1.39 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
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Technologies
Your stack
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Your stack
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