Stored script execution via crafted content data
Published Oct 23, 2025 · Updated Oct 23, 2025
Stored XSS in Six Apart Movable Type affected editions allows remote authenticated users to execute script in an editor's browser. Public advisories identify Edit ContentData but do not disclose which field fails to neutralize stored input before rendering. The attacker needs ContentType Management privilege, and a victim must open the affected edit page; execution is confined to that user's browser context.
Summary
What happened
Stored XSS in Six Apart Movable Type affected editions allows remote authenticated users to execute script in an editor's browser. Public advisories identify Edit ContentData but do not disclose which field fails to neutralize stored input before rendering. The attacker needs ContentType Management privilege, and a victim must open the affected edit page; execution is confined to that user's browser context.
The record
- CVE
- CVE-2025-54856
- Published
- Oct 23, 2025
- Updated
- Oct 23, 2025
- Vendor
- Six Apart Ltd.
- Product
- Movable Type Advanced
- Classifications
- CWE-79, T1059.007
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Oct 23, 2025CVE publishedPublication date reported by the CVE source.
- Oct 23, 2025Record 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=7 r.5509 and earlier (7 series)
- Affected versionversion=8.0.0 to 8.0.7 (8.0 series)
- Affected versionversion=8.4.0 to 8.4.3 (8.4 series)
What conditions does exploitation require?
What is affected?
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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