CVE-2026-61456
MediumCVSS 4.6Summary
The Grav API plugin before version 1.0.3 fails to sanitize SVG files uploaded via the POST /api/v1/media endpoint. The processUploadedFile() method only validates the file extension and does not call Security::sanitizeSVG(), allowing an authenticated attacker with api.media.write permission to upload an SVG containing arbitrary JavaScript. The file is stored unmodified and served with Content-Type: image/svg+xml; when an administrator opens it in a browser, the embedded script executes in their session context, enabling cookie theft and session hijacking.
Risk Assessment
The risk for the organization includes session hijacking of an administrator through malicious SVG script execution, potentially leading to data theft, unauthorized access to the admin panel, and further attack escalation.
Recommendation
Immediately update the Grav API plugin to version 1.0.3 or later. If an update is not possible, temporarily disable the POST /api/v1/media endpoint or restrict access to trusted users only.
Other vulnerabilities in Grav API plugin
See all- CVE-2026-80204Medium
The Grav API plugin before 1.0.18 does not enforce API-key scope caps in the injectSecurityTab() function of BlueprintController. A caller with a scoped API key may see and potentially edit page permission fields beyond the granted scope.
- CVE-2026-75836High
The Grav API plugin (getgrav/grav-plugin-api, bundled with Grav's admin-next/API stack) before 1.0.14 fails to enforce the authorize requirement in MenubarController::executeAction(). While the GET /menubar/items listing endpoint correctly filters menubar items via userPassesAuthorize(), the POST /api/v1/menubar/actions/{plugin}/{action} endpoint only checks the baseline api.access permission and never evaluates the authorize field a plugin registered for that action. Any authenticated caller with api.access can therefore invoke a privileged menubar action directly, bypassing the intended authorization. No plugin bundled with core Grav currently registers a privileged authorize handler, so on a stock install the impact is latent; the flaw affects any first- or third-party plugin relying on the documented authorize semantics.
- CVE-2026-75835Medium
Grav API plugin (getgrav/grav-plugin-api) before 1.0.14 contains a missing authorization vulnerability in userPassesAuthorize() (AbstractApiController.php). The function fails to consult the calling request's API key scopes, relying instead on the account's raw super-admin flag and ACL grants. As a result, an authenticated attacker holding a scoped API key minted on a privileged account can bypass their declared scope restrictions to access authorize-gated UI metadata and item definitions (sidebar/menubar/widget items and users-list columns/row-actions/filter-tabs) that their key scope should deny, resulting in information disclosure.
- CVE-2026-75833Medium
The Grav API plugin (getgrav/grav-plugin-api, bundled with Grav 2.0's admin-next/API stack) before version 1.0.14 contains an open redirect weakness in SsoController::sanitizeReturnTo(). The function rejects a literal '//' prefix but does not account for browsers normalizing backslashes to slashes in special (http/https) schemes, so a returnTo value such as '/\evil.com' passes the guard and is later resolved by the browser as the protocol-relative URL '//evil.com'. Following a legitimate OAuth login flow, an attacker-supplied returnTo parameter could redirect an authenticated victim to an attacker-controlled site for post-login phishing. Full browser-side exploitability depends on the admin-next SPA's client-side oauth-callback handler and was not independently verified by the reporter.
- CVE-2026-58656High
The Grav API plugin before v1.0.0-rc.16 accepts JWT tokens via the ?token= URL query parameter and responds with Access-Control-Allow-Origin: *, allowing unauthenticated attackers to make fully authenticated cross-origin API requests from any malicious website. Attackers who obtain a leaked JWT token from access logs, proxy logs, browser history, or Referrer headers can create persistent backdoor super-admin accounts and exfiltrate sensitive configuration and user data.
- CVE-2026-42843High
The Grav API Plugin is a RESTful API for Grav CMS that provides full access to content, media, configuration, and user management. Prior to version 1.0.0-beta.15, there is a vulnerability related to insecure direct object reference and logic flaw, allowing authenticated users to modify their own permissions.
- CVE-2026-62668Critical
Vulnerability in Grav API Plugin (plugin for Grav CMS) before version 1.0.6. WebhookController.php accepts webhook URLs after only FILTER_VALIDATE_URL syntax validation, and WebhookDispatcher.php initializes cURL without CURLOPT_PROTOCOLS or CURLOPT_REDIR_PROTOCOLS restrictions. An account with api.webhooks.write can submit file, dict, gopher, private-network, or link-local targets, retrieve local files and delivery response bodies, and pivot requests to internal services or cloud metadata endpoints. Fixed in version 1.0.6.
- CVE-2026-65007Critical
The Grav api plugin (grav-plugin-api) before version 1.0.8 fails to properly authorize API key generation and revocation. It intercepts the apiKeyGenerate/apiKeyRevoke admin tasks before the account-management ACL runs and authorizes the caller on only the admin.login permission (the baseline permission held by every panel user). This allows any user with admin.login to mint a persistent API key bound to any account, and the forged key inherits the target account's API permissions. On installs where an API-enabled account holds broader permissions, this enables account impersonation and privilege escalation up to account takeover.
- CVE-2026-61451Critical
The Grav API plugin (grav-plugin-api) before version 1.0.4 does not validate the origin of the admin_base_url field in the POST /api/v1/auth/forgot-password endpoint. The sanitizeHttpUrl() function only checks the URL scheme (http/https) and never verifies the host against the server's own origin, allowing an attacker to supply an arbitrary host. An unauthenticated attacker can cause the password reset email sent to a victim to contain a reset link pointing at an attacker-controlled server; when the victim follows the link, the valid reset token is disclosed to the attacker, enabling full account takeover.
- CVE-2026-56708Medium
Grav API plugin before 1.0.16 contains a server-side request forgery vulnerability in webhook delivery that allows attackers to bypass hostname validation by DNS rebinding. Attackers controlling authoritative DNS for a configured webhook hostname can answer validation lookups with public addresses and delivery lookups with private addresses to reach internal network resources.
Original NVD description (English source)
The Grav API plugin (getgrav/grav-plugin-api) before 1.0.3 fails to sanitize SVG files uploaded through the POST /api/v1/media endpoint. The HandlesMediaUploads::processUploadedFile() method validates only the file extension and never invokes Security::sanitizeSVG(), so an authenticated attacker with the api.media.write permission can upload an SVG containing arbitrary JavaScript. The file is stored unmodified and served with Content-Type: image/svg+xml; when an administrator opens it in a browser (directly or via <object>/<iframe>), the embedded script executes in their session context, enabling cookie theft and session hijacking.