How severe is CVE-2026-42843?

CVE-2026-42843 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-42843 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-42843?

CVE-2026-42843 primarily affects Getgrav Grav-plugin-api. In total, 14 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-42843?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-42843 have an EU (EUVD) identifier?

Yes. CVE-2026-42843 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29128.

When was CVE-2026-42843 published?

CVE-2026-42843 was published on 2026-05-11 and last updated on 2026-06-17.

CVE-2026-42843

CVE-2026-42843 is a high-severity vulnerability in Getgrav Grav-plugin-api with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-863.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 0% (27th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-29128
Weakness: CWE-863
Affected product: Getgrav Grav-plugin-api
Published: 2026-05-11
Last modified: 2026-06-17

Description

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 to Super Administrator (admin.super and api.super), leading to full system compromise and potential RCE. This vulnerability is fixed in 1.0.0-beta.15.

Frequently asked questions

What is CVE-2026-42843?: 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 to Super Administrator (admin.super and api.super), leading to full system compromise and potential RCE. This vulnerability is fixed in 1.0.0-beta.15.
How severe is CVE-2026-42843?: CVE-2026-42843 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-42843 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-42843?: CVE-2026-42843 primarily affects Getgrav Grav-plugin-api. In total, 14 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-42843?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-42843 have an EU (EUVD) identifier?: Yes. CVE-2026-42843 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29128.
When was CVE-2026-42843 published?: CVE-2026-42843 was published on 2026-05-11 and last updated on 2026-06-17.

References

https://github.com/getgrav/grav/security/advisories/GHSA-r945-h4vm-h736

Affected products (14)

cpe:2.3:a:getgrav:grav-plugin-api:1.0.0:beta1:*:*:*:*:*:*
cpe:2.3:a:getgrav:grav-plugin-api:1.0.0:beta10:*:*:*:*:*:*
cpe:2.3:a:getgrav:grav-plugin-api:1.0.0:beta11:*:*:*:*:*:*
cpe:2.3:a:getgrav:grav-plugin-api:1.0.0:beta12:*:*:*:*:*:*
cpe:2.3:a:getgrav:grav-plugin-api:1.0.0:beta13:*:*:*:*:*:*
cpe:2.3:a:getgrav:grav-plugin-api:1.0.0:beta14:*:*:*:*:*:*
cpe:2.3:a:getgrav:grav-plugin-api:1.0.0:beta2:*:*:*:*:*:*
cpe:2.3:a:getgrav:grav-plugin-api:1.0.0:beta3:*:*:*:*:*:*
cpe:2.3:a:getgrav:grav-plugin-api:1.0.0:beta4:*:*:*:*:*:*
cpe:2.3:a:getgrav:grav-plugin-api:1.0.0:beta5:*:*:*:*:*:*
cpe:2.3:a:getgrav:grav-plugin-api:1.0.0:beta6:*:*:*:*:*:*
cpe:2.3:a:getgrav:grav-plugin-api:1.0.0:beta7:*:*:*:*:*:*
cpe:2.3:a:getgrav:grav-plugin-api:1.0.0:beta8:*:*:*:*:*:*
cpe:2.3:a:getgrav:grav-plugin-api:1.0.0:beta9:*:*:*:*:*:*

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