SecuriTricks - CVE-2025-66305

Description

Grav is a file-based Web platform. Prior to 1.8.0-beta.27, a Denial of Service (DoS) vulnerability was identified in the "Languages" submenu of the Grav admin configuration panel (/admin/config/system). Specifically, the Supported parameter fails to properly validate user input. If a malformed value is inserted—such as a single forward slash (/) or an XSS test string—it causes a fatal regular expression parsing error on the server. This leads to application-wide failure due to the use of the preg_match() function with an improperly constructed regular expression, resulting in an error. Once triggered, the site becomes completely unavailable to all users. This vulnerability is fixed in 1.8.0-beta.27.

Product(s) Impacted

Vendor	Product	Versions
Getgrav	Grav	*, 1.8.0

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-248

Uncaught Exception

An exception is thrown from a function, but it is not caught.

*CPE(s)

Affected systems and software identified for this CVE.

Type	Vendor	Product	Version	Update	Edition	Language	Software Edition	Target Software	Target Hardware	Other Information
a	getgrav	grav	/	/	/	/	/	/	/	/
a	getgrav	grav	1.8.0	beta1	/	/	/	/	/	/
a	getgrav	grav	1.8.0	beta10	/	/	/	/	/	/
a	getgrav	grav	1.8.0	beta11	/	/	/	/	/	/
a	getgrav	grav	1.8.0	beta12	/	/	/	/	/	/
a	getgrav	grav	1.8.0	beta13	/	/	/	/	/	/
a	getgrav	grav	1.8.0	beta14	/	/	/	/	/	/
a	getgrav	grav	1.8.0	beta15	/	/	/	/	/	/
a	getgrav	grav	1.8.0	beta16	/	/	/	/	/	/
a	getgrav	grav	1.8.0	beta17	/	/	/	/	/	/
a	getgrav	grav	1.8.0	beta18	/	/	/	/	/	/
a	getgrav	grav	1.8.0	beta19	/	/	/	/	/	/
a	getgrav	grav	1.8.0	beta2	/	/	/	/	/	/
a	getgrav	grav	1.8.0	beta20	/	/	/	/	/	/
a	getgrav	grav	1.8.0	beta21	/	/	/	/	/	/
a	getgrav	grav	1.8.0	beta22	/	/	/	/	/	/
a	getgrav	grav	1.8.0	beta23	/	/	/	/	/	/
a	getgrav	grav	1.8.0	beta24	/	/	/	/	/	/
a	getgrav	grav	1.8.0	beta25	/	/	/	/	/	/
a	getgrav	grav	1.8.0	beta26	/	/	/	/	/	/
a	getgrav	grav	1.8.0	beta3	/	/	/	/	/	/
a	getgrav	grav	1.8.0	beta4	/	/	/	/	/	/
a	getgrav	grav	1.8.0	beta5	/	/	/	/	/	/
a	getgrav	grav	1.8.0	beta6	/	/	/	/	/	/
a	getgrav	grav	1.8.0	beta7	/	/	/	/	/	/
a	getgrav	grav	1.8.0	beta8	/	/	/	/	/	/
a	getgrav	grav	1.8.0	beta9	/	/	/	/	/	/

References

https://github.com/getgrav/grav/commit/ed640a13143c4177af013cf001969ed2c5e197ee

https://github.com/getgrav/grav/security/advisories/GHSA-m8vh-v6r6-w7p6

CVSS Score

6.9 / 10

CVSS Data - 4.0

Attack Vector: NETWORK
Attack Complexity: LOW
Attack Requirements: NONE
Privileges Required: HIGH
User Interaction: NONE
Scope:
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: HIGH
Exploit Maturity: NOT_DEFINED

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

View Vector String

Timeline

Published: Dec. 1, 2025, 10:15 p.m.
Last Modified: Dec. 3, 2025, 6:50 p.m.

Status : Analyzed

CVE has had analysis completed and all data associations made.

More info

Source

security-advisories@github.com

CVE-2025-66305