CVE-2026-76839 Grav before 2.0.16 Information Disclosure via offsetGet
Attackers with page-edit permissions can extract hashed passwords and 2FA secrets from User objects via Twig templates, enabling offline cracking and authentication bypass.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-76839?
CVE-2026-76839 is a high-severity vulnerability in getgrav grav, published on 25 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Grav before 2.0.16 allows sandboxed Twig templates to access sensitive User fields through allow-listed offsetGet() and offsetexists() methods that lack field filtering. Attackers with page-edit permissions can call offsetGet() on User objects to extract hashed passwords and 2FA secrets, enabling offline password cracking and authentication bypass.
Weakness: CWE-522
Which versions are affected by CVE-2026-76839?
2 open source packages ship an affected version, including getgrav/grav.
| Package | Affected | Fixed in |
|---|---|---|
getgrav/grav Packagist | All versions | 2.0.16 |
getgrav/grav Packagist | All versions | 2.0.16 |
How do I fix CVE-2026-76839?
Upgrade getgrav/grav to 2.0.16 or later.
Is CVE-2026-76839 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-76839 exists.
Sources
Also known as GHSA-3jhr-mxmx-38cx.