CVE-2026-55871Proof of concept (PoC) published · CISA

GYM One: Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') in admin/users/index.php

CVSS score

6.5

EPSS probability

%0.3

Risk score

0.0

Published

4 d ago

Overview Public Exploits (0)Newsroom Vulnerability Timeline

Patch status has not yet been verified

Resmî kaynaklarda yeterli kanıt bulunamadı. Bu sonuç “yama yok” anlamına gelmez.

Impact on My Inventory

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Vulnerability description

CVE AI research

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DayBreach AI Explanation

Verified against sources

CVE-2026-55871: SQL Injection Vulnerability in GYM-One

Sources read

Source agreement

Tam uyum

Evidence confidence

%63

Short explanation

CVE-2026-55871 is an SQL injection vulnerability in admin/users/index.php of GYM-One caused by improper parameter handling.

Why does it matter?

An authenticated attacker can exploit this vulnerability to read sensitive data from database tables and potentially write to the filesystem depending on database permissions.

What should be done?

Update the software to the latest version
Follow vendor security advisories

Chain of evidence and sources2 verified claims

GYM-One 1.4.1 öncesi sürümlerde admin/users/index.php dosyası search_name ve search_email parametrelerini hazırlıklı ifadeler kullanmadan birleştirmektedir.

S0 · daybreach-canonical S1 · cvelist S2 · nvd

Kimliği doğrulanmış bir yönetici, arama alanları üzerinden SQL enjeksiyonu gerçekleştirerek hassas verilere erişebilir.

S0 · daybreach-canonical S1 · cvelist S2 · nvd

Show the technical text from the sources

GYM One is open-source gym management software for fitness centers, personal trainers, and sports clubs. Prior to 1.4.1, GYM One's admin/users/index.php concatenates the search_name and search_email GET parameters into both the user-list query and the COUNT query used for pagination without prepared statements. An authenticated administrator can inject SQL through either search field to read data from arbitrary tables, including user information and password hashes. Depending on database permissions, the same injection may also permit filesystem writes. This issue is fixed in version 1.4.1.

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

CWE: CWE-89

Explanation produced with the local gemini-flash-lite-latest model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-55871 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

ID	VENDOR	PRODUCT	ACTION
1	mayerbalintdev	GYM-One	View

Total affected vendors: 1|Products: 1

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCORE	VERSION	SEVERITY	VECTOR	SOURCE
6.5	CVSS V3_1	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N	CVE CNA
6.5	CVSS V31	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N	NVD

Patch and Remediation Guide

Solution & Remediation Advisory

Patch status unknown

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Confirm the affected product and version against the source evidence above.

Restrict access to internet-facing services and apply network segmentation.

Until a patch is confirmed, follow the vendor advisory; do not read an unknown status as “no patch”.

Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-55871 is associated with the following CWEs:

CWE-89: Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-55871 weaknesses.

CAPEC-66: SQL Injection CAPEC-126: Path Traversal CAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureAğ üzerinden

PermissionsHigh

UserGerekmiyor

Official Sources and Advisories

https://github.com/mayerbalintdev/GYM-One/security/advisories/GHSA-9j4g-cq35-8997vendor-advisory https://github.com/mayerbalintdev/GYM-One/commit/d3a0cf134f0ab3ac12aee7dca283b93c4290dcc4vendor-advisory https://github.com/mayerbalintdev/GYM-One/releases/tag/V1.4.1vendor-advisory

CVSS Vector Radar Chart

6.5 / 10

Vulnerability Scoring Details

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

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredHigh privileges

User InteractionNone required

Confidentiality (Gizlilik)Low

Integrity (Bütünlük)None

Availability (Erişilebilirlik)None

Yama durumu bilinmiyor

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Follow the vendor

mayerbalintdev

Weakness Type (CWE & CAPEC)

CWE-89

Similar Vulnerabilities

8.7

CVE-2026-55872GYM One admin user list is vulnerable to stored cross-site scripting

Vendormayerbalintdev ProductGYM-One

Patch status unknownEPSS %04 d ago

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