CVE-2026-57852Public exploitNetwork attack vector

Unauthenticated scheduled-job execution via null token

Published Jul 20, 2026 · Updated Jul 20, 2026

Authentication bypass in Grav Scheduler Webhook Plugin before 1.1.3 allows remote attackers to trigger operator-defined scheduled jobs. Scheduler::processWebhookTrigger() tests the configured token before comparing it, so null short-circuits rejection and accepts a tokenless request. The webhook must be enabled with no token set; one unauthenticated POST runs configured jobs, including shell commands, under the web server account.

CVSS severity6.3
Medium
EPSS probability0.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Grav Scheduler Webhook Plugin before 1.1.3 allows remote attackers to trigger operator-defined scheduled jobs. Scheduler::processWebhookTrigger() tests the configured token before comparing it, so null short-circuits rejection and accepts a tokenless request. The webhook must be enabled with no token set; one unauthenticated POST runs configured jobs, including shell commands, under the web server account.

The record

CVE
CVE-2026-57852
Published
Jul 20, 2026
Updated
Jul 20, 2026
Vendor
Grav
Product
Grav Scheduler Webhook Plugin
Classifications
CWE-303, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=1.1.3
  2. Affected versionversion=0 <=2.0.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Grav · Grav Scheduler Webhook Pluginversion=0 <=1.1.3; version=0 <=2.0.8

Published CVSS scores

6.3VulnCheckCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
5.6VulnCheckCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-303Incorrect Implementation of Authentication Algorithm
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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