CVE-2023-27241Public exploitNetwork attack vector

Browser script execution via unneutralized client surname

Published Mar 27, 2023 · Updated Feb 19, 2025

Stored cross-site scripting in SourceCodester Water Billing System 1.0 allows remote attackers to expose a user's cookie via a client surname. The addclient1.php endpoint accepts an encoded script in the lname field, and the Add Client flow executes it in the browser without neutralization. Execution requires user interaction with the crafted client data and permits access to browser-readable cookies and modification of displayed page content.

CVSS severity6.1
Medium
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in SourceCodester Water Billing System 1.0 allows remote attackers to expose a user's cookie via a client surname. The addclient1.php endpoint accepts an encoded script in the lname field, and the Add Client flow executes it in the browser without neutralization. Execution requires user interaction with the crafted client data and permits access to browser-readable cookies and modification of displayed page content.

The record

CVE
CVE-2023-27241
Published
Mar 27, 2023
Updated
Feb 19, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 27, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 19, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.1NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/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
Privilegesunauthenticated
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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