CVE-2026-76839Public exploitNetwork attack vector

Credential disclosure via unfiltered sandboxed offsetGet

Published Aug 25, 2026 · Updated Aug 25, 2026

Information disclosure in GetGrav Grav before 2.0.16 allows remote authenticated users to extract password hashes and 2FA secrets. The Twig sandbox allow-lists offsetGet() and offsetExists() on UserInterface, while User::offsetGet() returns sensitive fields without the redaction applied by jsonSerialize(). Page-edit permission and a sandbox context containing a User object are required; exposed hashes enable offline cracking, and 2FA seeds permit valid TOTP generation.

CVSS severity8.7
High
EPSS probability0.27%
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 2.0.16 allows remote authenticated users to extract password hashes and 2FA secrets. The Twig sandbox allow-lists offsetGet() and offsetExists() on UserInterface, while User::offsetGet() returns sensitive fields without the redaction applied by jsonSerialize(). Page-edit permission and a sandbox context containing a User object are required; exposed hashes enable offline cracking, and 2FA seeds permit valid TOTP generation.

The record

CVE
CVE-2026-76839
Published
Aug 25, 2026
Updated
Aug 25, 2026
Vendor
GetGrav
Product
Grav
Classifications
CWE-522, T1555
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 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=0 <2.0.16

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

GetGrav · Gravversion=0 <2.0.16

Published CVSS scores

6.5VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA: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 exploitPublished

Weakness, pattern, technique

CWE-522Insufficiently Protected Credentials
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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