How severe is CVE-2021-47812?

CVE-2021-47812 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-47812 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-47812?

CVE-2021-47812 affects Getgrav Grav. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-47812?

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

Does CVE-2021-47812 have an EU (EUVD) identifier?

Yes. CVE-2021-47812 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-3032.

When was CVE-2021-47812 published?

CVE-2021-47812 was published on 2026-01-16 and last updated on 2026-06-17.

CVE-2021-47812

CVE-2021-47812 is a critical-severity vulnerability in Getgrav Grav with a CVSS 3.x base score of 9.8. 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-862.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 9.3
EPSS exploit prediction: 2% (78th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-3032
Weakness: CWE-862
Affected product: Getgrav Grav
Published: 2026-01-16
Last modified: 2026-06-17

Description

GravCMS 1.10.7 contains an unauthenticated vulnerability that allows remote attackers to write arbitrary YAML configuration and execute PHP code through the scheduler endpoint. Attackers can exploit the admin-nonce parameter to inject base64-encoded payloads and create malicious custom jobs with system command execution.

Frequently asked questions

What is CVE-2021-47812?: GravCMS 1.10.7 contains an unauthenticated vulnerability that allows remote attackers to write arbitrary YAML configuration and execute PHP code through the scheduler endpoint. Attackers can exploit the admin-nonce parameter to inject base64-encoded payloads and create malicious custom jobs with system command execution.
How severe is CVE-2021-47812?: CVE-2021-47812 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-47812 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-47812?: CVE-2021-47812 affects Getgrav Grav. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-47812?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2021-47812 have an EU (EUVD) identifier?: Yes. CVE-2021-47812 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-3032.
When was CVE-2021-47812 published?: CVE-2021-47812 was published on 2026-01-16 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:getgrav:grav:1.10.7:*:*:*:*:*:*:*

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