Vulnerability in getgrav/grav (CVE-2026-76839)
Summary
Vulnerability in getgrav/grav (CVE-2026-76839). Confidential information can be exposed externally. Exploitable via offsetget. Mitigation: upgrade to 2.0.16 or later.
Original description
The description as published by the source.
Summary
system/config/security.yaml's Twig sandbox policy allow-lists offsetget and
offsetexists for Grav\Common\User\Interfaces\UserInterface. The concrete
Grav\Common\User\DataUser\User class does not filter which fields offsetGet()
returns, so any sandboxed template with access to a User object can read
hashed_password, secret (2FA seed), and twofa_secret directly, bypassing the
redaction Grav's own code applies everywhere else.
The core evidence, from Grav's own code
system/src/Grav/Common/User/DataUser/User.php:
/**
* {@inheritdoc}
* Override to filter out sensitive fields like password hashes
*/
public function jsonSerialize(): array
{
$items = parent::jsonSerialize();
// Security: Remove sensitive fields that should never be exposed to frontend
unset($items['hashed_password']);
unset($items['secret']); // 2FA secret
unset($items['twofa_secret']); // Alternative 2FA field name
return $items;
}
public function offsetGet($offset)
{
$value = parent::offsetGet($offset);
// only special-cases 'authorized', nothing else -- no redaction
return $value;
}
system/config/security.yaml:
- class: 'Grav\Common\User\Interfaces\UserInterface'
methods: 'authorize, authorized, authenticated, username, fullname, email, language, offsetget, offsetexists'
This is the same vulnerability shape as two already-fixed issues in this file
(GHSA-j274-39qw-32c9 and GHSA-mc5q-6hpj-rp7j --…
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-76839 has been found in getgrav/grav.
Attackers can target a specific entry point like offsetget over the network to misuse the product.
Confidential information can be exposed externally. CVSS score: 6.5/10.
What to do: upgrade getgrav/grav to 2.0.16 or later.
If unsure, ask your IT team or search "getgrav/grav CVE-2026-76839" on the vendor's site.
CVE-2026-76839 (getgrav/grav) — CWE-522 / CVSS v3 6.5
Attack vector: remote (network-reachable) / no user interaction
Attack surface: offsetget / offsetexists / User / hashed_password
Patched: 2.0.16 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-522) exists in getgrav/grav. Attackers reach the vulnerable code path via offsetget.
Check the vendor advisory for the affected versions of getgrav/grav. Attack surface: offsetget / offsetexists / User / hashed_password.
Severity: Medium (CVSS 6.5/10). Confidential information can be exposed externally.
Update to 2.0.16.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'getgrav/grav' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'getgrav/grav' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
getgrav/gravを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade getgrav/grav to 2.0.16ステージング環境で 2.0.16 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- web github.com
- web disclosure@vulncheck.com
- web nvd.nist.gov
- web github.com
- web github.com