CVE-2026-76839: Insufficiently Protected Credentials in getgrav grav
Grav CMS versions before 2.0.16 have a vulnerability where sandboxed Twig templates can access sensitive User object fields without proper filtering. This allows attackers with page-edit permissions to retrieve hashed passwords and two-factor authentication secrets. The vulnerability enables offline password cracking and potential authentication bypass.
AI Analysis
Technical Summary
CVE-2026-76839 affects Grav CMS prior to version 2.0.16. The issue arises because sandboxed Twig templates can invoke the allow-listed offsetGet() and offsetexists() methods on User objects, which do not filter sensitive fields. Consequently, attackers with page-edit permissions can extract hashed passwords and 2FA secrets, increasing the risk of offline password cracking and authentication bypass. No official patch or remediation level is currently documented, and no known exploits are reported in the wild.
Potential Impact
An attacker with page-edit permissions can access sensitive credential information, including hashed passwords and two-factor authentication secrets, from User objects. This exposure can lead to offline password cracking attempts and potentially bypass authentication mechanisms, compromising user accounts and site security.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict page-edit permissions to trusted users only and monitor for suspicious activity related to template editing.
CVE-2026-76839: Insufficiently Protected Credentials in getgrav grav
Description
Grav CMS versions before 2.0.16 have a vulnerability where sandboxed Twig templates can access sensitive User object fields without proper filtering. This allows attackers with page-edit permissions to retrieve hashed passwords and two-factor authentication secrets. The vulnerability enables offline password cracking and potential authentication bypass.
CVSS v4.0
Score 8.7high
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-76839 affects Grav CMS prior to version 2.0.16. The issue arises because sandboxed Twig templates can invoke the allow-listed offsetGet() and offsetexists() methods on User objects, which do not filter sensitive fields. Consequently, attackers with page-edit permissions can extract hashed passwords and 2FA secrets, increasing the risk of offline password cracking and authentication bypass. No official patch or remediation level is currently documented, and no known exploits are reported in the wild.
Potential Impact
An attacker with page-edit permissions can access sensitive credential information, including hashed passwords and two-factor authentication secrets, from User objects. This exposure can lead to offline password cracking attempts and potentially bypass authentication mechanisms, compromising user accounts and site security.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict page-edit permissions to trusted users only and monitor for suspicious activity related to template editing.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-08-19T20:34:19.723Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a8cf57bacd9273b498428ae
Added to database: 08/25/2026, 01:52:59 UTC
Last enriched: 08/25/2026, 02:07:44 UTC
Last updated: 08/25/2026, 02:12:08 UTC
Views: 3
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