CVE-2026-39344Public exploitNetwork attack vector

Reflected XSS via unencoded username prefill

Published Apr 7, 2026 · Updated Apr 7, 2026

Reflected XSS in the ChurchCRM login page before 7.1.0 allows remote attackers to execute script in a user's browser via a crafted URL. src/session/index.php assigns the URL username parameter to prefilledUserName, and begin-session.php emits it unencoded into an input value attribute. Exploitation requires a user to open the crafted link; the script can read browser-accessible session data or replace the page with a credential-capture form.

CVSS severity8.1
High
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in the ChurchCRM login page before 7.1.0 allows remote attackers to execute script in a user's browser via a crafted URL. src/session/index.php assigns the URL username parameter to prefilledUserName, and begin-session.php emits it unencoded into an input value attribute. Exploitation requires a user to open the crafted link; the script can read browser-accessible session data or replace the page with a credential-capture form.

The record

CVE
CVE-2026-39344
Published
Apr 7, 2026
Updated
Apr 7, 2026
Vendor
ChurchCRM
Product
ChurchCRM
Classifications
CWE-80, CWE-79, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 7, 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=< 7.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ChurchCRM · ChurchCRMversion=< 7.1.0

Published CVSS scores

8.1GitHub, Inc.CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/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.

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

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001Malicious Link

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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