CVE-2026-28507

HighPublic PoCRCE

Published: 06 March 2026

Published

06 March 2026

Modified

16 March 2026

KEV Added

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Patch

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CVSS Score v4 8.6 CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Score 0.0067 47.3th percentile

Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-28507 is a high-severity OS Command Injection (CWE-78) vulnerability in Withknown Known. Its CVSS base score is 8.6 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 47.3th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).

Deeper analysis

CVE-2026-28507 is a remote code execution vulnerability in Idno, an open-source social publishing platform. Versions prior to 1.6.4 are affected due to chained import file write and template path traversal issues, mapped to CWE-78 (OS Command Injection). The vulnerability received a CVSS v3.1 base score of 7.2 (AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H) and was published on 2026-03-06.

High-privilege users (PR:H), such as administrators, can exploit this remotely over the network (AV:N) with low attack complexity (AC:L) and no user interaction required (UI:N). Successful exploitation allows attackers to achieve high impacts on confidentiality, integrity, and availability (C:H/I:H/A:H) within the target's scope (S:U), enabling arbitrary remote code execution on the server.

The issue has been patched in Idno version 1.6.4. Administrators should upgrade to this version or later to mitigate the vulnerability. Additional details are available in the GitHub security advisory at https://github.com/idno/idno/security/advisories/GHSA-37j7-56xc-c468 and release notes at https://github.com/idno/idno/releases/tag/1.6.4.

OWASP Top 10 for Web (2025)

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2026-9983

Vulnerability details

Idno is a social publishing platform. Prior to version 1.6.4, there is a remote code execution vulnerability via chained import file write and template path traversal. This issue has been patched in version 1.6.4.

CWE(s): CWE-78

Related Threats

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 →

T1059.004 Unix Shell Execution

Adversaries may abuse Unix shell commands and scripts for execution.

attack.mitre.org →

T1068 Exploitation for Privilege Escalation Privilege Escalation

Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.

attack.mitre.org →

Why these techniques?

RCE via OS command injection (CWE-78) and path traversal/file write in a web publishing platform directly enables exploitation of public-facing apps for initial or post-auth access, Unix shell command execution, and privilege escalation from app admin to OS-level code execution.

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0