CVE-2026-27975: Ajenti potential remote code execution (RCE) — what to know and how to respond

CVE-2026-27975 is a newly disclosed vulnerability in Ajenti (a Linux/BSD server administration panel) that could allow an unauthenticated attacker to gain access and execute arbitrary code on the server. The issue affects Ajenti versions earlier than 2.2.13 and is fixed in 2.2.13. (github.com)

Why this matters

Remote code execution vulnerabilities are high-impact because they can quickly turn into full server compromise—especially when:

• The service is internet-facing,
• No authentication is required to trigger the issue, and
• The compromised host has privileged access to other systems.

GitHub’s advisory describes the impact as unauthenticated server access leading to arbitrary code execution. (github.com)

Affected versions and severity

Affected versions

• Vulnerable: Ajenti < 2.2.13 (github.com)
• Patched: Ajenti 2.2.13 (github.com)

Severity signals (what we know today — 2026-02-26)

• CVE aggregators currently show a CVSS 4.0 base score of 8.1 (High) (source listed as GitHub). (cvedetails.com)
• GitHub’s advisory labels the issue Critical. (github.com)

What’s fixed in 2.2.13?

Ajenti’s v2.2.13 release notes indicate security-related changes, including:

• “Security fix: More checks on headers.”
• “Security fix: Cache isolation and time limited.” (github.com)

(Release notes don’t fully explain exploit mechanics, so treat exposed Ajenti instances as potentially at risk until upgraded.)

Recommended mitigation steps (practical checklist)

1. Identify Ajenti exposure
• Confirm whether Ajenti is installed and which version you’re running.
• Determine whether the Ajenti web interface is internet-accessible (public IP, port forwards, reverse proxy).

• Upgrade immediately
• Upgrade Ajenti to 2.2.13 (or later, if available in your environment). (github.com)
• Reduce attack surface
• Restrict access to Ajenti admin UI (allowlist VPN/corporate IP ranges).
• Place Ajenti behind an authenticated reverse proxy (where appropriate).
• Disable external exposure entirely if it’s not required.
• Hunt for post-exploitation indicators
• Review for suspicious process execution, new users, modified cron jobs, webshell-like artifacts, and outbound connections from the server.
• If you suspect compromise: isolate the host, acquire triage artifacts, rotate credentials, and validate integrity.

Detection and response with Microsoft Sentinel (and how SecQube helps)

Even when a CVE write-up is short, the operational challenge is consistent: confirm exposure, prioritize risk, hunt quickly, and standardize response across servers and tenants.

SecQube’s AI-powered SOC platform for Microsoft Sentinel helps teams move faster by:

• guiding incident triage via a conversational workflow (no KQL expertise required),
• generating and running relevant threat-hunting queries,
• operationalizing response steps through automated playbooks and ticketing,
• supporting multi-tenant operations for MSSPs and distributed enterprises.

If you’re managing multiple customer environments or business units, this type of “fast-turn” vulnerability response is exactly where a multi-tenant, AI-assisted Sentinel operations layer reduces mean time to understand (MTTU) and mean time to respond (MTTR).
Learn more about SecQube here: SecQube

References

• GitHub Security Advisory: “Ajenti has a potential Remote Code Execution” (GHSA-vcw3-r3fx-j444) (github.com)
• Ajenti release v2.2.13 (security fixes) (github.com)
• CVE summary (affected versions, fix version, CVSS snapshot) (cvedetails.com)

If you tell me your target audience (MSSP vs in-house IT/SOC) and preferred length, I can turn this into a fully formatted StoryChief post with meta title, meta description, FAQ schema questions, and a “How to detect in Sentinel” section aligned to your content template.