CVE-2023-1031Public exploitNetwork attack vector

Authenticated JavaScript execution via stored template injection

Published May 8, 2023 · Updated Jan 29, 2025

Stored client-side template injection in MonicaHQ 4.0.0 allows remote authenticated users to execute JavaScript through first_name. The settings endpoint stores first_name without adequate validation, and client-side rendering evaluates embedded template expressions instead of treating them as text. An account is required; the stored code runs in a viewer's browser and can use that session's CSRF token to change an email address or delete an account.

CVSS severity8.8
High
EPSS probability1.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored client-side template injection in MonicaHQ 4.0.0 allows remote authenticated users to execute JavaScript through first_name. The settings endpoint stores first_name without adequate validation, and client-side rendering evaluates embedded template expressions instead of treating them as text. An account is required; the stored code runs in a viewer's browser and can use that session's CSRF token to change an email address or delete an account.

The record

CVE
CVE-2023-1031
Published
May 8, 2023
Updated
Jan 29, 2025
Vendor
Butterfly Effect Pte. Ltd.
Product
Monica
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 8, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 29, 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.

  1. Affected versionversion=4.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Butterfly Effect Pte. Ltd. · Monicaversion=4.0.0

Published CVSS scores

8.0Fluid AttacksCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
8.8NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

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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