Stored script execution via unescaped memo rendering
Published Dec 23, 2022 · Updated Apr 10, 2025
Stored XSS in Memos before 0.9.0 allows remote authenticated users to execute script in other users' browsers through crafted memo text. The frontend highlighter assigns unescaped memo HTML to innerHTML, while bold, emphasis, and link renderers recursively parse unescaped text. A low-privileged author can persist markup that runs when another user views the rendered memo, exposing or modifying data available to that browser session.
Summary
What happened
Stored XSS in Memos before 0.9.0 allows remote authenticated users to execute script in other users' browsers through crafted memo text. The frontend highlighter assigns unescaped memo HTML to innerHTML, while bold, emphasis, and link renderers recursively parse unescaped text. A low-privileged author can persist markup that runs when another user views the rendered memo, exposing or modifying data available to that browser session.
The record
- CVE
- CVE-2022-4690
- Published
- Dec 23, 2022
- Updated
- Apr 10, 2025
- Vendor
- Memos
- Product
- Memos
- Classifications
- CWE-79, T1059.007
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Dec 23, 2022CVE publishedPublication date reported by the CVE source.
- Apr 10, 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 <0.9.0
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
- Huntr stored-XSS proof of conceptproof of concept · demonstrated
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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