CVE-2023-4870Public exploitNetwork attack vector

Stored script execution via unencoded contact fields

Published Sep 10, 2023 · Updated Jun 25, 2025

Stored XSS in SourceCodester Contact Manager App 1.0 allows remote authenticated users to execute scripts in another user’s browser. index.php writes database-backed contact fields directly into HTML without output encoding, so saved markup becomes executable page content. An authenticated user must save a crafted contact value and a victim must view the contact list, allowing script execution in the application’s origin.

CVSS severity6.1
Medium
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in SourceCodester Contact Manager App 1.0 allows remote authenticated users to execute scripts in another user’s browser. index.php writes database-backed contact fields directly into HTML without output encoding, so saved markup becomes executable page content. An authenticated user must save a crafted contact value and a victim must view the contact list, allowing script execution in the application’s origin.

The record

CVE
CVE-2023-4870
Published
Sep 10, 2023
Updated
Jun 25, 2025
Vendor
SourceCodester
Product
Contact Manager App
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 10, 2023CVE publishedPublication date reported by the CVE source.
  2. Jun 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.

  1. Affected versionversion=1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

SourceCodester · Contact Manager Appversion=1.0

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.0VulDBAV:N/AC:L/Au:S/C:N/I:P/A:N
3.5VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N

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.

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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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