CVE-2026-42843 | grav-plugin-api: Grav API Privilege Escalation to Super Admin

Exp

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.

Published: 2026-05-11 Last update: 2026-05-27 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-42843 is rated Exploit Available (54.3/100): CVSS High severity, with low exploitation likelihood (EPSS 0.04%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2026-42843

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2026-42843

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-12 — 0.04% —

Full EPSS history (1 record total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-42843

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.8 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 [email protected]

Weakness enumeration for CVE-2026-42843

GitHub Security Advisory for CVE-2026-42843

GHSA-r945-h4vm-h736 · Severity: high · Ecosystem: composer — Grav API Privilege Escalation to Super Admin

Affected software / configurations for CVE-2026-42843

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

References for CVE-2026-42843

cvelogic Threat Intelligence