VulnerabilityModified

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.

CRITICAL 9.3EPSS 2.24%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (2.24%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

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 4.0: 9.3 CRITICALCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
EPSS: 2.24% probability · 82th percentile
CISA KEV: Not listed
Weakness: CWE-862
Affected: getgrav/grav
Source: disclosure@vulncheck.com

References

https://getgrav.orgProduct
https://www.exploit-db.com/exploits/49973Exploit
https://www.vulncheck.com/advisories/gravcms-arbitrary-yaml-writeupdate-unauthenticatedThird Party Advisory
https://www.exploit-db.com/exploits/49973Exploit

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.