Stored XSS via unencoded post content
Published Aug 25, 2025 · Updated Aug 25, 2025
Stored XSS in the Post Handler in Mtons Mblog 3.0 through 3.5.0 allows remote authenticated users to execute script via post content. The /post/submit endpoint stores the content field without security checks, and post, editing, and admin views render it without output encoding. An account able to publish a post can persist markup that executes when another user, including an administrator, opens an affected view.
Summary
What happened
Stored XSS in the Post Handler in Mtons Mblog 3.0 through 3.5.0 allows remote authenticated users to execute script via post content. The /post/submit endpoint stores the content field without security checks, and post, editing, and admin views render it without output encoding. An account able to publish a post can persist markup that executes when another user, including an administrator, opens an affected view.
The record
- CVE
- CVE-2025-9429
- Published
- Aug 25, 2025
- Updated
- Aug 25, 2025
- Vendor
- Mtons
- Product
- Mblog
- Classifications
- CWE-94, CWE-79, T1059.007
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 25, 2025CVE publishedPublication date reported by the CVE source.
- Aug 25, 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=3.0
- Affected versionversion=3.1
- Affected versionversion=3.2
- Affected versionversion=3.3
- Affected versionversion=3.4
- Affected versionversion=3.5.0
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
- Stored XSS article-content proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
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