Authenticated JavaScript execution via unvalidated introduction template input
Published May 8, 2023 · Updated Feb 3, 2025
Stored cross-site scripting in Monica 4.0.0 allows remote authenticated users to execute JavaScript through contact introduction data. The people/:id/introductions endpoint stores first_met_additional_info without neutralizing template expressions, which the client evaluates when another user views the contact. An account is required to plant the payload, and a second user's viewing session executes it with that user's privileges, enabling account data changes or deletion.
Summary
What happened
Stored cross-site scripting in Monica 4.0.0 allows remote authenticated users to execute JavaScript through contact introduction data. The people/:id/introductions endpoint stores first_met_additional_info without neutralizing template expressions, which the client evaluates when another user views the contact. An account is required to plant the payload, and a second user's viewing session executes it with that user's privileges, enabling account data changes or deletion.
The record
- CVE
- CVE-2023-30787
- Published
- May 8, 2023
- Updated
- Feb 3, 2025
- Vendor
- Butterfly Effect Pte. Ltd.
- Product
- Monica
- Classifications
- CWE-79, T1059.007
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- May 8, 2023CVE publishedPublication date reported by the CVE source.
- Feb 3, 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=4.0.0
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
- Fluid Attacks CSTI proof of conceptfunctional · demonstrated
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Technologies
Your stack
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Your stack
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