CVE-2026-40593Public exploitNetwork attack vector

Stored XSS via unencoded username attribute

Published Apr 18, 2026 · Updated Apr 18, 2026

Stored XSS in ChurchCRM before 7.2.0 allows remote authenticated users to execute JavaScript in an administrator's browser. UserEditor.php inserts a database-loaded username into an input value attribute without HTML attribute encoding, allowing quotes to inject event handlers. An administrator must save the crafted login name, and another administrator must open that user's editor page; execution occurs in the victim's browser session.

CVSS severity4.8
Medium
EPSS probability0.20%
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 ChurchCRM before 7.2.0 allows remote authenticated users to execute JavaScript in an administrator's browser. UserEditor.php inserts a database-loaded username into an input value attribute without HTML attribute encoding, allowing quotes to inject event handlers. An administrator must save the crafted login name, and another administrator must open that user's editor page; execution occurs in the victim's browser session.

The record

CVE
CVE-2026-40593
Published
Apr 18, 2026
Updated
Apr 18, 2026
Vendor
ChurchCRM
Product
ChurchCRM
Classifications
CWE-79, CWE-116, T1203
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Apr 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 18, 2026Record 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=< 7.2.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

ChurchCRM · ChurchCRMversion=< 7.2.0

Published CVSS scores

4.8GitHubCVSS:3.1/AV:N/AC:L/PR:H/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-116Improper Encoding or Escaping of Output
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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