CVE-2026-42843: Grav API Plugin is a RESTful API for Grav CMS that provides full headless access to your site's content, media

This month

HIGH 8.8DOWNGRADE

CVE-2026-42843 is a high-severity flaw (CVSS 8.8) affecting grav-plugin-api. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Grav API Plugin is a RESTful API for Grav CMS that provides full headless access to your site's content, media, configuration, users, and system management. Prior to 1.0.0-beta.15, an insecure direct object reference and logic flaw in the Grav API plugin (UsersController::update) allows any authenticated user with basic API access (api.access) to modify their own permission configuration. An attacker can exploit this to escalate their privileges

Why this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 72%)
CISA exploited list	No
Weakness	CWE-863
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 17:16 UTCPublished CVE record published
2026-10-26 18:10 UTCUpdated Record last modified

getgrav grav-plugin-api DOWNGRADE

Affected: 1.0.0 beta1 · 1.0.0 beta10 · 1.0.0 beta11 · 1.0.0 beta12 · 1.0.0 beta13 · 1.0.0 beta14 · 1.0.0 beta2 · 1.0.0 beta3

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.0.0 (Debian / Ubuntu)

apt-cache madison grav-plugin-api sudo apt install grav-plugin-api=<VERSION_BEFORE_1.0.0> sudo apt-mark hold grav-plugin-api

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list grav-plugin-api sudo dnf downgrade grav-plugin-api-<VERSION_BEFORE_1.0.0> sudo dnf versionlock add grav-plugin-api

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2026-42843?

grav-plugin-api: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-42843 being exploited?

CVE-2026-42843 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-2026-42843 affect?

CVE-2026-42843 affects grav-plugin-api. Severity is high (CVSS 8.8). Grav API Plugin is a RESTful API for Grav CMS that provides full headless access to your site's content, media, configuration, users, and system management. Prior to 1.0.0-beta.15, an insecure direct object reference and logic flaw in the G

How urgent is CVE-2026-42843?

Priority 43/100. High severity; Public exploit reference

References

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