Stored script execution via unescaped strikethrough content
Published Dec 29, 2022 · Updated Apr 9, 2025
Stored XSS in Memos before 0.9.1 allows remote authenticated users to execute script in another user's browser via a crafted memo. The custom Markdown renderer recursively parsed strikethrough content as markup instead of escaping it, allowing stored input to become executable HTML. An attacker must be able to store memo content, and another user must render it; script execution can read or alter data available to that browser session.
Summary
What happened
Stored XSS in Memos before 0.9.1 allows remote authenticated users to execute script in another user's browser via a crafted memo. The custom Markdown renderer recursively parsed strikethrough content as markup instead of escaping it, allowing stored input to become executable HTML. An attacker must be able to store memo content, and another user must render it; script execution can read or alter data available to that browser session.
The record
- CVE
- CVE-2022-4841
- Published
- Dec 29, 2022
- Updated
- Apr 9, 2025
- Vendor
- Memos
- Product
- Memos
- Classifications
- CWE-79, T1203
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Dec 29, 2022CVE publishedPublication date reported by the CVE source.
- Apr 9, 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=unspecified <0.9.1
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
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Technologies
Your stack
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Your stack
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