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CVE-2026-42613

Grav: Privilege Escalation via Missing Server-Side Validation of groups/access

Published: May 11, 2026Updated: May 12, 2026 Sources: CVE List NVDCWE-20
NVD MITRE
9.4CVSSCRITICAL
EPSS Score
0.9%
Top 43.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

Description

Grav is a file-based Web platform. Prior to 2.0.0-beta.2, the Login::register() method in the Login plugin accepts attacker-controlled groups and access fields from the registration POST data without server-side validation. When registration is enabled and groups or access are included in the configured allowed fields list, an unauthenticated user can self-register with admin.super privileges by injecting these fields into the registration request. This vulnerability is fixed in 2.0.0-beta.2.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:LAvailability
Low
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Weaknesses

CWE-20CWE-862

Affected Products

gravgetgrav
On-prem
Web & CMS Plugins / cms-core
getgravoss-projectWeb & CMS Pluginsaka grav, grav-plugin-admin, getgrav/grav

Attack Graph

Products CVE Techniques Tactics

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Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

2 techniques
Initial Access
View detailed technique mapping

References

https://github.com/getgrav/grav/security/advisories/GHSA-pxm6-mhxr-q4mj
github.com
https://github.com/getgrav/grav-plugin-login/commit/3d419a0dabd70aed1fd49afcd5919004a4141da1
github.com
https://github.com/getgrav/grav/security/advisories/GHSA-w48r-jppp-rcfw
github.com

Timeline

Published
May 11, 2026
Last Updated
May 12, 2026

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