6.9

CVE-2025-66305: getgrav grav Uncaught Exception

CVSS: 6.9v4.0MediumAnalyzed
Published 01-12-2025Last modified 02-12-2025
Open JSON

Vulnerability summary

CVE-2025-66305 is a medium (CVSS 6.9) Uncaught Exception vulnerability in getgrav grav. EPSS estimates a 0.39% chance of exploitation in the next 30 days, higher than 31.2% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
38/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.9/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.39%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github

Timeline

  1. 01-12-2025
    PublishedVulnerability first disclosed.
  2. 02-12-2025
    Last modifiedVulnerability information updated.

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.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

0.39%

Chance of exploitation in the next 30 days

Percentile

31%

Versus all other CVEs

30-day change

0.00 pp

From 0.39% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.39%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • githubUnverified

    Grav

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Getgrav1 product
  • grav< 1.8.0-beta.27 | ≥ 1.7.48, < 1.8.0 | 1.8.0:beta1 | 1.8.0:beta10 | 1.8.0:beta11 | 1.8.0:beta12 | 1.8.0:beta13 | 1.8.0:beta14 | 1.8.0:beta15 | 1.8.0:beta16 | 1.8.0:beta17 | 1.8.0:beta18 | 1.8.0:beta19 | 1.8.0:beta2 | 1.8.0:beta20 | 1.8.0:beta21 | 1.8.0:beta22 | 1.8.0:beta23 | 1.8.0:beta24 | 1.8.0:beta25 | 1.8.0:beta26 | 1.8.0:beta3 | 1.8.0:beta4 | 1.8.0:beta5 | 1.8.0:beta6 | 1.8.0:beta7 | 1.8.0:beta8 | 1.8.0:beta9

1 vendor · 1 product

References

2 links