What is the CVSS score of CVE-2026-24891?

CVE-2026-24891 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Is there a public PoC exploit available for CVE-2026-24891?

Yes, a public proof-of-concept exploit is available for CVE-2026-24891. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-24891?

Within 24 hours: Inventory all openITCOCKPIT deployments and identify version numbers; isolate affected instances from production networks if possible; disable Gearman worker functionality if not critical to operations. Within 7 days: Implement network segmentation to restrict Gearman worker access to trusted internal IPs only; enable enhanced logging and monitoring for deserialization attempts; prepare incident response procedures. Within 30 days: Monitor vendor security advisories for patch availability; evaluate alternative monitoring solutions; conduct security assessment of any potentially compromised systems.

Openitcockpit CVE-2026-24891

HIGH

Deserialization of Untrusted Data (CWE-502)

2026-02-20 security-advisories@github.com

PHP Deserialization Prometheus Openitcockpit It Novum

7.5

CVSS 3.1 · GitHub Advisory

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Authenticate as low-privilege user
Exploit

Enqueue malicious serialized PHP object to Gearman
Execution

Worker deserializes payload via unserialize()
Impact

Execute arbitrary code as worker process

Vulnerability Assessment

Weakness	CWE CWE-502 OWASP Top 10:2025 A08:2025 - Software or Data Integrity Failures ASVS 5.0 V1 - Encoding and Sanitization Safe deserialization, type allowlists MITRE ATT&CK 2 techniques across 2 tactics: Execution, Initial Access The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Exploitation Conditions	openITCOCKPIT versions 5.3.1 and below with Gearman worker enabled. Requires valid low-privilege application credentials and network access to Gearman service. Trust boundary between Gearman and worker not enforced in code.
Impact	CVSS 7.5 (HIGH). Attack vector: Network. Complexity: High. Privileges required: Low. User interaction: None. Exploitable via remote/network. Public exploit/POC available.
Exploit ScenarioDerived	A remote attacker could exploit this vulnerability to compromise the affected system.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

No patch listed yet 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Remote code execution in openITCOCKPIT 5.3.1 and earlier via unsafe deserialization in the Gearman worker component, which calls unserialize() on untrusted job payloads without validation or class restrictions. Attackers can exploit this by submitting crafted serialized objects to trigger PHP Object Injection when Gearman is exposed to untrusted networks. Public exploit code exists for this vulnerability, and no patch is currently available.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 22:04 CVSS 7.5

RemediationAI

Fixed in version 5.4.0.. Restrict network access to the affected service where possible.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Classified as CWE-502 (Deserialization of Untrusted Data). Affects the environments where the Gearman component of Openitcockpit. openITCOCKPIT is an open source monitoring tool built for different monitoring engines like Nagios, Naemon and Prometheus. Versions 5.3.1 and below contain an unsafe deserialization sink in the Gearman worker implementation. The worker function registered as oitc_gearman calls PHP's unserialize() on job payloads without enforcing class restrictions or validating data origin. While the intended deployment assumes only trusted internal components enqueue Gearman jobs, this trust boundary is not en

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

GitHub Advisory PRIMARY 7.5 HIGH

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

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

PoC Detected

Feb 24, 2026 - 19:22 vuln.today

Public exploit code

CVE Published

Feb 20, 2026 - 18:25 nvd

HIGH 7.5

DescriptionGitHub Advisory

openITCOCKPIT is an open source monitoring tool built for different monitoring engines like Nagios, Naemon and Prometheus. Versions 5.3.1 and below contain an unsafe deserialization sink in the Gearman worker implementation. The worker function registered as oitc_gearman calls PHP's unserialize() on job payloads without enforcing class restrictions or validating data origin. While the intended deployment assumes only trusted internal components enqueue Gearman jobs, this trust boundary is not enforced in application code. In environments where the Gearman service or worker is exposed to untrusted systems, an attacker may submit crafted serialized payloads to trigger PHP Object Injection in the worker process. This vulnerability is exploitable when Gearman listens on non-local interfaces, network access to TCP/4730 is unrestricted, or untrusted systems can enqueue jobs. Default, correctly hardened deployments may not be immediately exploitable, but the unsafe sink remains present in code regardless of deployment configuration. Enforcing this trust boundary in code would significantly reduce risk and prevent exploitation in misconfigured environments. This issue has been fixed in version 5.4.0.

Executive ViewAI

Why It Matters

openITCOCKPIT monitoring deployments running version 5.3.1 or below are vulnerable to remote code execution through unsafe deserialization in the Gearman worker component. Active public exploits exist, creating immediate risk of infrastructure compromise and potential lateral movement into monitored systems. Organizations using this tool must act urgently to mitigate exposure while awaiting vendor patches.

Business Impact: High

Compensating Controls

Implement network-based access controls restricting Gearman worker ports (typically 4730) to trusted internal sources only; disable Gearman workers if functionality can be provided through alternative methods; deploy Web Application Firewall (WAF) rules to block suspicious deserialization payloads if Gearman is exposed via HTTP endpoint; implement runtime application self-protection (RASP) if available; increase monitoring and alerting on Gearman worker process behavior and unexpected code execution; consider disabling PHP object deserialization functions (unserialize) at the application level if feasible without breaking functionality.

Threat Intelligence Overview

EPSS Score

0.1%

Top 72% exploitable

Exploit

POC

Public exploit code exists

Data Quality

4 sources

Confidence: Medium

NVD

CVE.org

EPSS

GitHub

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC Yes

EPSS 0.1%

Patch available No

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

Poc

System Exposure· derived

Open

Automatable· derived

Human Impact

High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +38

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Insecure Deserialization CRITICAL

Insecure deserialization occurs when an application converts serialized data (a stream of bytes representing an object's state) back into a living object without proper validation.