CVE-2026-27161

HighPublic PoC

Published: 21 February 2026

Published

21 February 2026

Modified

24 February 2026

KEV Added

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Patch

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CVSS Score 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS Score 0.0004 12.0th percentile

Risk Priority 15 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-27161 is a high-severity Exposure of Sensitive Information to an Unauthorized Actor (CWE-200) vulnerability in Getsimple-Ce Getsimple Cms. Its CVSS base score is 7.5 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 12.0th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190) and 3 other techniques.

Threat & Defense Details

Likely Mitigating ControlsAI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

AC-15 Automated Marking

addresses: CWE-200

Automated marking applies security attributes to system outputs, making it harder for attackers to exploit unmarked sensitive information leading to unauthorized exposure.

AC-16 Security and Privacy Attributes

addresses: CWE-200

Proper attribute retention and permitted-value enforcement limits unauthorized actors from accessing sensitive information lacking correct labels.

AC-20 Use of External Systems

addresses: CWE-200

Prevents unauthorized exposure of sensitive information by prohibiting untrusted external systems from processing or storing it.

AC-21 Information Sharing

addresses: CWE-200

By enforcing authorization matching prior to sharing, the control reduces the risk of exposing sensitive information to unauthorized actors.

AC-22 Publicly Accessible Content

addresses: CWE-200

Review and removal of nonpublic information from publicly accessible systems directly prevents exposure of sensitive data to unauthorized actors.

AC-23 Data Mining Protection

addresses: CWE-200

Data mining protection mechanisms detect and block unauthorized bulk extraction of sensitive data, directly mitigating exposure to unauthorized actors.

AT-2 Literacy Training and Awareness

addresses: CWE-200

Literacy training teaches users to recognize and avoid actions that result in unauthorized exposure of sensitive information.

AT-4 Training Records

addresses: CWE-200

Retaining and monitoring training records confirms personnel have completed privacy and security awareness training on handling sensitive data, reducing the chance of unauthorized exposure due to lack of knowledge.

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

T1083 File and Directory Discovery Discovery

Adversaries may enumerate files and directories or may search in specific locations of a host or network share for certain information within a file system.

attack.mitre.org →

T1005 Data from Local System Collection

Adversaries may search local system sources, such as file systems, configuration files, local databases, virtual machine files, or process memory, to find files of interest and sensitive data prior to Exfiltration.

attack.mitre.org →

T1552.001 Credentials In Files Credential Access

Adversaries may search local file systems and remote file shares for files containing insecurely stored credentials.

attack.mitre.org →

Why these techniques?

Vulnerability in public-facing CMS directly enables exploitation via T1190; allows unauthenticated directory listing (T1083) and file download (T1005) from sensitive paths, exposing credentials/keys in files (T1552.001).

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1

NVD Description

GetSimple CMS is a content management system. All versions of GetSimple CMS rely on .htaccess files to restrict access to sensitive directories such as /data/ and /backups/. If Apache AllowOverride is disabled (common in hardened or shared hosting environments), these…

protections are silently ignored, allowing unauthenticated attackers to list and download sensitive files including authorization.xml, which contains cryptographic salts and API keys. This issue does not have a fix at the time of publication.

Deeper analysisAI

CVE-2026-27161 is a vulnerability in all versions of GetSimple CMS, a content management system. The issue arises because the software relies on .htaccess files to restrict access to sensitive directories such as /data/ and /backups/. When Apache's AllowOverride directive is disabled—a configuration common in hardened or shared hosting environments—these .htaccess protections are silently ignored, enabling unauthorized access to those directories.

Unauthenticated attackers can exploit this vulnerability remotely with low attack complexity, requiring no privileges or user interaction. Successful exploitation allows them to list directory contents and download sensitive files, including authorization.xml, which contains cryptographic salts and API keys. The CVSS v3.1 base score is 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N), reflecting high confidentiality impact and mapping to CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor).

The GitHub Security Advisory at https://github.com/GetSimpleCMS-CE/GetSimpleCMS-CE/security/advisories/GHSA-f63g-xh6j-q56g, published on 2026-02-21, confirms that no fix is available at the time of disclosure.