CVE-2025-66304Public exploitNetwork attack vector

Password-hash disclosure via unfiltered user serialization

Published Dec 1, 2025 · Updated Dec 2, 2025

Information disclosure in GetGrav Grav before 1.8.0-beta.27 allows remote authenticated users to read all users' password hashes. The UserObject and DataUser jsonSerialize methods retain hashed_password and two-factor secrets when serializing user records to the Admin frontend. Read access to the Admin user-account section is required; cracking an administrator hash grants administrative access.

CVSS severity6.2
Medium
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in GetGrav Grav before 1.8.0-beta.27 allows remote authenticated users to read all users' password hashes. The UserObject and DataUser jsonSerialize methods retain hashed_password and two-factor secrets when serializing user records to the Admin frontend. Read access to the Admin user-account section is required; cracking an administrator hash grants administrative access.

The record

CVE
CVE-2025-66304
Published
Dec 1, 2025
Updated
Dec 2, 2025
Vendor
GetGrav
Product
Grav
Classifications
CWE-201, CWE-200, T1555
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Dec 1, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 2, 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=< 1.8.0-beta.27

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

GetGrav · Gravversion=< 1.8.0-beta.27

Published CVSS scores

6.2GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:L
7.2NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-201Insertion of Sensitive Information Into Sent Data
CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1555Credentials from Password Stores

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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