EUVD-2026-42903
GHSA-xg8j-6m35-m6wr
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable authoring endpoint (AV:N/AC:L) requires a low-privilege page-author account (PR:L), no interaction, and leaks secrets giving high confidentiality impact with no integrity or availability effect.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
2DescriptionCVE.org
Grav before 2.0.2 contains a Twig sandbox bypass that allows a page author (any admin.pages user, or anyone able to write to user/pages) to exfiltrate configuration secrets. Although the sandbox replaces the 'config' variable with a redacted facade and strips Config::get/toArray from the method allowlist, the raw container remains accessible via the allow-listed grav.offsetGet('config'), which returns the real Config object. Allow-listed object-dumping filters (json_encode, print_r, yaml_encode) then serialize that object at the PHP level without invoking the sandbox method gate, exposing the full config tree including plugin secrets such as SMTP credentials, API keys, and plugin DB credentials. This is an incomplete fix for GHSA-j274-39qw-32c9.
AnalysisAI
Sensitive configuration exfiltration in Grav CMS before 2.0.2 lets an authenticated page author bypass the Twig sandbox and read the full config tree, including plugin SMTP credentials, API keys, and database passwords. The flaw is an incomplete fix for the earlier GHSA-j274-39qw-32c9 sandbox escape: the redacted 'config' facade is still trivially bypassed through the allow-listed grav.offsetGet('config') call. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated Grav account with the admin.pages permission, or any means of writing files into user/pages, so the attacker must already be able to author page content that Grav will render through Twig. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N) scores 7.1 and cleanly matches the described behavior: network-reachable, low complexity, requiring low privileges (a page-authoring account), no user interaction, and high confidentiality impact with no integrity or availability impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A user with an admin.pages account (for example, a delegated content editor or a compromised low-privilege author account) creates or edits a page containing a crafted Twig expression such as one that calls grav.offsetGet('config') and pipes the result through json_encode or print_r. When the page renders, the real Config object is serialized in the output, revealing SMTP credentials and plugin API keys, which the attacker then reuses against those external services. … |
| Remediation | Vendor-released patch: upgrade to Grav 2.0.2 or later, which restores the sandbox method gate against the offsetGet-plus-serialization-filter bypass; see GHSA-mc5q-6hpj-rp7j (https://github.com/getgrav/grav/security/advisories/GHSA-mc5q-6hpj-rp7j). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all Grav CMS installations and document versions; audit access logs for template modifications by page author accounts. …
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External POC / Exploit Code
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