9.8

CVE-2021-47812: getgrav grav Missing Authorization

CVSS: 9.8v3.1CriticalModified
Published 15-01-2026Last modified 07-04-2026
Open JSON

Vulnerability summary

CVE-2021-47812 is a critical (CVSS 9.8) Missing Authorization vulnerability in getgrav grav. EPSS estimates a 2.20% chance of exploitation in the next 30 days, higher than 82.2% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
2.20%
0%100%
Low · -0.03 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1exploit-database

Timeline

  1. 15-01-2026
    PublishedVulnerability first disclosed.
  2. 07-04-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 2 sources · 2 versions

EPSS trend

Probability

2.20%

Chance of exploitation in the next 30 days

Percentile

82%

Versus all other CVEs

30-day change

-0.03 pp

From 2.24% on 20-09-2026

20-09-202620-10-2026
EPSS score
2.20%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • exploit-databasephpVerified

    GravCMS 1.10.7 - Arbitrary YAML Write/Update (Unauthenticated) (2)

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Getgrav2 products

1 vendor · 2 products

References

3 links