---
title: "CVE-2026-42613: Grav Vulnerable to Privilege Escalation via Missing Server-Side Validation of groups/access"
url: https://erroneo.us/security/cve/CVE-2026-42613/
description: "CVE-2026-42613 (getgrav/grav (Composer (PHP))): Grav is a file-based Web platform. Prior to 2.0.0-beta.2, the Login::register() method in the Login plugin…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-05-11
date_modified: 2026-05-13
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-42613"
kev: false
cvss: 9.4
epss: 0.00558
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-42613: Grav Vulnerable to Privilege Escalation via Missing Server-Side Validation of groups/access

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Not in CISA KEV , but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 0.6% , percentile 46: FIRST’s model estimates a 0.6% chance of exploitation activity in the next 30 days, higher than 46% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes getgrav/grav (Composer (PHP)) < 2.0.0-beta.2, fixed in 2.0.0-beta.2 . Check your lockfile, including transitive dependencies.

## What it is

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.

## Affected packages

- Composer (PHP) `getgrav/grav` < 2.0.0-beta.2 → fixed: 2.0.0-beta.2

## Affected products (CVE record)

- getgrav grav: < 2.0.0-beta.2

## Severity

- GitHub_M CVSS 3.1: 9.4 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L`
- GitHub CVSS 3.1: 9.4 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.56% probability of exploitation activity in the next 30 days; percentile 46.

## Sources

- [GitHub Advisory GHSA-pxm6-mhxr-q4mj](https://github.com/advisories/GHSA-pxm6-mhxr-q4mj)
- [CVE.org record CVE-2026-42613](https://www.cve.org/CVERecord?id=CVE-2026-42613)
- [NVD entry CVE-2026-42613](https://nvd.nist.gov/vuln/detail/CVE-2026-42613)
- [github.com](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)

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Source page: https://erroneo.us/security/cve/CVE-2026-42613/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt