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Response snapshot Oct 29, 2026, 01:26 UTC

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VulnerabilityCVE-2026-63190

FearlessCMS is a flat-file `content` management system centered on simplicity and open source.

FearlessCMS is a flat-file content management system centered on simplicity and open source. Prior to version 0.1.4, five debug/test PHP scripts under admin/ perform privileged operations without isLoggedIn() authentication checks, CSRF protection or adequate path validation.

At a glance

Exploited
Not known
Severity
9.4 Critical (CVSS 3.1)
Chance of exploitation
Not estimated
Sources
1 source

What to do

Check the vendor advisory for affected versions and fixes.

Read NVD CVE-2026-63190 (opens a new tab)

What happened

FearlessCMS is a flat-file content management system centered on simplicity and open source. Prior to version 0.1.4, five debug/test PHP scripts under admin/ perform privileged operations without isLoggedIn() authentication checks, CSRF protection or adequate path validation. On PHP's built-in development server, including the default Docker deployment, router.

php checks an unnormalized admin URI prefix while the filesystem resolves dot segments, so /./admin/ bypasses the admin login gate and executes those scripts directly. In admin/debug_save_flow.php, attacker-controlled path and content reach file_put_contents for arbitrary .

md writes under content/ or outside it through path traversal, enabling site defacement and stored JavaScript in public pages; print_r($_POST) output without htmlspecialchars escaping also causes reflected cross-site scripting. The admin/debug_content.php path parameter reaches scandir(), file_get_contents() and posix_getpwuid(), permitting arbitrary directory enumeration and .

md file reads that expose absolute paths, ownership, permissions, hashes and content previews. The admin/preview-handler.php endpoint accepts JSON content and title and writes enumerable files under content/_preview/, enabling stored cross-site scripting and disk exhaustion. The admin/testdebug.php endpoint appends to admin/testdebug.log without authentication, also enabling disk exhaustion. The admin/test_redirect.

Continue reading

php script exposes a test artifact but escapes its inputs and is not itself an XSS sink. Stored script execution can steal sessions and compromise administrators when they view affected content. Reads and writes execute with PHP's privileges; the tested deployment runs PHP as root, amplifying filesystem impact. This issue is fixed in version 0.1.4.

Scores and how they were measured

CVSS base severity

9.4

Version 3.1As of

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

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

Not available

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Sources

  1. Primary source

    NVD CVE-2026-63190 (opens a new tab)

    NVD record: description, CVSS (the CNA score is preferred), affected products, and publication date. Not evidence of exploitation.

    Published Checked

  2. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  3. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  4. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, October 28). FearlessCMS is a flat-file `content` management system centered on simplicity and open source. (CVE-2026-63190). https://kevwire.com/record/CVE-2026-63190

MLA

"FearlessCMS is a flat-file `content` management system centered on simplicity and open source. (CVE-2026-63190)." KEVWire, 28 Oct. 2026, kevwire.com/record/CVE-2026-63190.

Chicago

KEVWire. "FearlessCMS is a flat-file `content` management system centered on simplicity and open source. (CVE-2026-63190)." Last modified October 28, 2026. https://kevwire.com/record/CVE-2026-63190.

Evidence summary (plain text)

FearlessCMS is a flat-file `content` management system centered on simplicity and open source. (Oct 28, 2026).
FearlessCMS is a flat-file content management system centered on simplicity and open source. Prior to version 0.1.4, five debug/test PHP scripts under admin/ perform privileged operations without isLoggedIn() authentication checks, CSRF protection or adequate path validation. On PHP's built-in development server, including the default Docker deployment, router.php checks an unnormalized admin URI prefix while the filesystem resolves dot segments, so /./admin/ bypasses the admin login gate and executes those scripts directly.
CVSS 9.4 (version 3.1; evidence as of Oct 28, 2026; https://nvd.nist.gov/vuln/detail/CVE-2026-63190).
Sources:
NVD CVE-2026-63190: https://nvd.nist.gov/vuln/detail/CVE-2026-63190
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-10-28T20:10:59.549Z&lastModEndDate=2026-10-28T21:40:57.581Z&resultsPerPage=500&startIndex=0
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-10-28T19:41:09.844Z&lastModEndDate=2026-10-28T21:10:56.744Z&resultsPerPage=500&startIndex=0
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-10-28T19:06:02.311Z&lastModEndDate=2026-10-28T20:40:57.063Z&resultsPerPage=500&startIndex=500
Record ID: CVE-2026-63190.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Not assessed.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
About this data

This record was ingested from a data source. Retrieved: Oct 28, 2026, 21:40 UTC. Ingestion is not an independent editorial investigation.

NVD status: Received. Publication in the NVD is not evidence of exploitation.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

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Record details

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