{"id":"CVE-2026-11430","state":"PUBLISHED","title":"Grav CMS Scheduler Webhook Authentication Bypass via Null Short-Circuit","description":"Grav CMS's scheduler-webhook plugin contains an authentication bypass in the webhook token check. When the webhook feature is enabled but no webhookToken is configured, a compound conditional short-circuits and skips token validation, so an unauthenticated remote attacker who can reach POST /scheduler/webhook can trigger the operator's already-configured scheduled jobs by sending a single request. The primitive is triggering-existing-jobs, not attacker-chosen command execution: the attacker controls when the jobs run and which one runs (via ?job=), but does not control what the jobs do. Code execution follows only when the operator has configured a job that shells out, and even then the attacker controls timing rather than payload. Not a default-install issue: reaching the endpoint requires the separate scheduler-webhook GPM plugin to be installed, scheduler.modern.webhook.enabled to be true (default false), and no webhookToken to be configured; a stock Grav or Grav-Admin install exposes nothing here.","publishedAt":"2026-08-07T19:02:10.025Z","updatedAt":"2026-10-01T21:44:58.603Z","severity":{"score":6.9,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N","source":"VulnCheck"},"assigner":"VulnCheck","products":["Trilby Media grav-plugin-scheduler-webhook","Trilby Media getgrav/grav"],"affected":[{"vendor":"Trilby Media","product":"grav-plugin-scheduler-webhook","defaultStatus":"affected","versions":[{"version":"0","status":"affected","lessThan":"1.1.3","versionType":"semver"}]},{"vendor":"Trilby Media","product":"getgrav/grav","defaultStatus":"affected","versions":[{"version":"0","status":"affected","lessThan":"2.0.9","versionType":"semver"}]}],"references":["https://github.com/getgrav/grav/security/advisories/GHSA-xwv3-2mv2-w33x","https://github.com/getgrav/grav","https://github.com/getgrav/grav/commit/694f1dae06d9061bbf0669c4291e3b206f998d71","https://www.vulncheck.com/advisories/grav-cms-scheduler-webhook-authentication-bypass-via-null-short-circuit"],"weaknesses":["CWE-303"],"ingestedAt":"2026-10-29T20:10:52.580Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/11xxx/CVE-2026-11430.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-11430","state":"PUBLISHED","datePublished":"2026-08-07T19:02:10.025Z","dateUpdated":"2026-10-01T21:44:58.603Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-06-05T21:01:53.800Z"},"containers":{"cna":{"title":"Grav CMS Scheduler Webhook Authentication Bypass via Null Short-Circuit","descriptions":[{"lang":"en","value":"Grav CMS's scheduler-webhook plugin contains an authentication bypass in the webhook token check. When the webhook feature is enabled but no webhookToken is configured, a compound conditional short-circuits and skips token validation, so an unauthenticated remote attacker who can reach POST /scheduler/webhook can trigger the operator's already-configured scheduled jobs by sending a single request. The primitive is triggering-existing-jobs, not attacker-chosen command execution: the attacker controls when the jobs run and which one runs (via ?job=), but does not control what the jobs do. Code execution follows only when the operator has configured a job that shells out, and even then the attacker controls timing rather than payload. Not a default-install issue: reaching the endpoint requires the separate scheduler-webhook GPM plugin to be installed, scheduler.modern.webhook.enabled to be true (default false), and no webhookToken to be configured; a stock Grav or Grav-Admin install exposes nothing here."}],"affected":[{"vendor":"Trilby Media","product":"grav-plugin-scheduler-webhook","defaultStatus":"affected","versions":[{"version":"0","status":"affected","lessThan":"1.1.3","versionType":"semver"}]},{"vendor":"Trilby Media","product":"getgrav/grav","defaultStatus":"affected","versions":[{"version":"0","status":"affected","lessThan":"2.0.9","versionType":"semver"}]}],"references":[{"url":"https://github.com/getgrav/grav/security/advisories/GHSA-xwv3-2mv2-w33x","name":"GitHub Security Advisory","tags":["technical-description"]},{"url":"https://github.com/getgrav/grav","name":"Product Repository","tags":["product"]},{"url":"https://github.com/getgrav/grav/commit/694f1dae06d9061bbf0669c4291e3b206f998d71","name":"Patch Commit","tags":["patch"]},{"url":"https://www.vulncheck.com/advisories/grav-cms-scheduler-webhook-authentication-bypass-via-null-short-circuit","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"LOW","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"LOW","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"MEDIUM","baseScore":6.9,"vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N"}},{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"LOW","version":"3.1","baseSeverity":"HIGH","baseScore":7.3,"vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-303","lang":"en","description":"Incorrect Implementation of Authentication Algorithm","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-10-01T21:44:58.603Z"},"datePublic":"2026-08-07T00:00:00.000Z","cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:getgrav:grav:*:*:*:*:*:*:*:*","versionEndExcluding":"2.0.9"}]}]}],"credits":[{"lang":"en","value":"Saidakbarxon Maxsudxonov and Usmon Khudoyorov","type":"finder"}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"vulncheck"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-07T20:56:04.638693Z","id":"CVE-2026-11430","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-07T21:02:02.538Z"}}]}}}