CVE-2026-42609: Grav is a file-based Web platform

Q: How do I fix CVE-2026-42609?

grav: upgrade to newer than 1.8.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-42609 being exploited?

CVE-2026-42609 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-42609 affect?

CVE-2026-42609 affects grav. Severity is high (CVSS 8.1). 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 admini

Q: How urgent is CVE-2026-42609?

Priority 43/100. High severity; Public exploit reference

This month

HIGH 8.1UPGRADE

CVE-2026-42609 is a high-severity flaw (CVSS 8.1) affecting grav. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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)

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 60%)
CISA exploited list	No
Weakness	CWE-269, CWE-285, CWE-639, CWE-837
Published	2026-05-11
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: getgrav

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-11 16:17 UTCPublished CVE record published
2026-10-26 18:10 UTCUpdated Record last modified

getgrav grav UPGRADE

Affected: <= 1.8.0 · 2.0.0 beta1

Fixed in: newer than 1.8.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy grav || rpm -q grav || grav --version

2. UPGRADE to newer than 1.8.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade grav

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade grav

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-42609?

grav: upgrade to newer than 1.8.0. Exact commands for each OS are on this page.

Is CVE-2026-42609 being exploited?

CVE-2026-42609 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-42609 affect?

CVE-2026-42609 affects grav. Severity is high (CVSS 8.1). 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 admini

How urgent is CVE-2026-42609?

Priority 43/100. High severity; Public exploit reference

Related CVEs

CVE-2026-42608 CRITICAL 9.1 UPGRADE Grav is a file-based Web platform
CVE-2026-42611 HIGH 8.9 UPGRADE Grav is a file-based Web platform
CVE-2026-42612 HIGH 8.5 UPGRADE Grav is a file-based Web platform
CVE-2026-44738 HIGH 7.7 UPGRADE Grav is a file-based Web platform
CVE-2026-42610 MEDIUM 6.5 UPGRADE Grav is a file-based Web platform

References

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