CVE-2025-64367Network attack vector

Contributor-level browser script execution via stored payloads

Published Oct 31, 2025 · Updated Oct 31, 2025

Stored cross-site scripting in Groundhogg 4.2.6 and earlier allows remote authenticated users to execute scripts in visitors' browsers. Published sources attribute the flaw to insufficient input sanitization and output escaping but do not identify the affected field or code path. Contributor-level access is required, and the payload runs when another user visits an affected page, exposing that browser session to script actions.

CVSS severity6.5
Medium
EPSS probability0.15%
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 Groundhogg 4.2.6 and earlier allows remote authenticated users to execute scripts in visitors' browsers. Published sources attribute the flaw to insufficient input sanitization and output escaping but do not identify the affected field or code path. Contributor-level access is required, and the payload runs when another user visits an affected page, exposing that browser session to script actions.

The record

CVE
CVE-2025-64367
Published
Oct 31, 2025
Updated
Oct 31, 2025
Vendor
Groundhogg Inc.
Product
Groundhogg
Classifications
CWE-79, CAPEC-592, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 31, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 31, 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=n/a <=<= 4.2.6 changes=[{"at":"4.2.6.1","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Groundhogg Inc. · Groundhoggversion=n/a <=<= 4.2.6 changes=[{"at":"4.2.6.1","status":"unaffected"}]

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
6.4WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/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.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-592Stored XSS
T1059.007JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

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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