---
title: "CVE-2026-100669: Grav - Information Disclosure"
description: "Grav before 2.0.25 contains an information disclosure vulnerability caused by case-sensitive access-control deny rules in IIS web.config and lighttpd.conf, letting unauthenticated remote attackers bypass restrictions to access sensitive files, exploit requires IIS with case-insensitive NTFS and specific file requests."
url: https://panop.io/threat-heartbeat/CVE-2026-100669/
---

# CVE-2026-100669 Grav - Information Disclosure

Grav before 2.0.25 contains an information disclosure vulnerability caused by case-sensitive access-control deny rules in IIS web.config and lighttpd.conf, letting unauthenticated remote attackers bypass restrictions to access sensitive files, exploit requires IIS with case-insensitive NTFS and specific file requests.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.44% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-100669)

## Details

Type

Information Disclosure

Impact

Information Disclosure, File System Read

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Published

26 September 2026

Updated

15 October 2026

Weakness

[CWE-178](https://cwe.mitre.org/data/definitions/178.html)

## Vendor fix

Upgrade to version 2.0.25 and re-copy corrected web.config and lighttpd.conf sample files.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-100669](https://nvd.nist.gov/vuln/detail/CVE-2026-100669)
- [https://github.com/getgrav/grav/security/advisories/GHSA-pg8v-xw58-frq8](https://github.com/getgrav/grav/security/advisories/GHSA-pg8v-xw58-frq8)
- [https://www.vulncheck.com/advisories/grav-before-2.0.25-sensitive-file-disclosure-via-case-variation-bypass](https://www.vulncheck.com/advisories/grav-before-2.0.25-sensitive-file-disclosure-via-case-variation-bypass)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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