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Fencer Vulns
high 8.1

CVE-2026-42609 json

Grav: Administrative Account Disruption and Privilege De-escalation via User Overwrite Logic

published 2026-05-05 6 mo ago modified 2026-10-26 13 d ago also EUVD-2026-29067 , GHSA-rr73-568v-28f8

cvss
8.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 40%
public exploits
0
none known

Summary

Grav is a file-based Web platform. Prior to 2.0.0-beta.2, a business logic vulnerability in the Grav Admin Panel allows a low-privileged user (with only user creation permissions) to overwrite existing accounts, including the primary administrator. By creating a new user with a username that already exists, the system updates the existing account's metadata and permissions instead of rejecting the request. This leads to a Denial of Service (DoS) on administrative functions and Privilege De-escalation of the root account. This vulnerability is fixed in 2.0.0-beta.2.

Patch / fix

  • packagist getgrav/grav 2.0.0-beta.2
  • getgrav grav 2.0.0-beta.2
  • getgrav grav_cms 2.0.0-beta.2

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
5 mo ago

Exploit prediction

0.46% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/getgrav/grav/security/advisories/GHSA-rr73-568v-28f8 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 8.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
GitHub 3.1 8.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

Affected packages

ecosystem package affected fixed in
packagist getgrav/grav
<2.0.0-beta.2
2.0.0-beta.2

Affected products

  • getgrav grav

Classification

Weakness
  • CWE-269 Improper Privilege Management
  • CWE-285 Improper Authorization
  • CWE-639 Authorization Bypass Through User-Controlled Key
  • CWE-837 Improper Enforcement of a Single, Unique Action

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.