CVE-2026-2234VulnerabilityPublished 9 Feb 2026

CVE-2026-2234: HGiga C&Cm@il package olln-base · Missing Authentication

Affects HGiga C&Cm@il package olln-baseSource CVE Database V5

Not known to be exploited · CVSS 9.3 Critical : upgrade to 7.0-978 as a priority.

Data as of 26 Oct 2026, 08:30 UTC

CVSS 4.0 base score

9.3Critical

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.5% chance of exploitation in 30 days – higher than 43% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 7.0-978

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Attack Vector: Network
Attack Complexity: Low
Attack Requirements: None
Privileges Required: None
User Interaction: None
Vulnerable system confidentiality: High
Vulnerable system integrity: High
Vulnerable system availability: None
Subsequent system confidentiality: None
Subsequent system integrity: None
Subsequent system availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Attack Requirements: None: The successful attack does not depend on the deployment and execution conditions of the vulnerable system. The attacker can expect to be able to reach the vulnerability and execute the exploit under all or most instances of the vulnerability.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without interaction from any human user, other than the attacker.
Vulnerable system confidentiality: High: There is a total loss of confidentiality, resulting in all information within the Vulnerable System being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact. For example, an attacker steals the administrator's password, or private encryption keys of a web server.
Vulnerable system integrity: High: There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the vulnerable system. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the vulnerable system.
Vulnerable system availability: None: There is no impact to availability within the Vulnerable System.
Subsequent system confidentiality: None: There is no loss of confidentiality within the Subsequent System or all confidentiality impact is constrained to the Vulnerable System.
Subsequent system integrity: None: There is no loss of integrity within the Subsequent System or all integrity impact is constrained to the Vulnerable System.
Subsequent system availability: None: There is no impact to availability within the Subsequent System or all availability impact is constrained to the Vulnerable System.

Definitions: FIRST CVSS v4.0 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 9 Feb 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade HGiga C&Cm@il package olln-base to 7.0-978.

Affected software

Product	Affected	Fixed in
HGigaC&Cm@il package olln-base	Affected <7.0-978	Fixed in 7.0-978

AI-suggested

Given the absence of an official patch at the time of disclosure, European organizations should implement immediate compensating controls. These include restricting network access to the HGiga C&Cm@il service using firewalls or VPNs to limit exposure to trusted users only. Employ network segmentation to isolate mail servers from less secure network zones. Monitor network traffic and logs for unusual access patterns or unauthorized modifications to mail content. Implement strong anomaly detection and intrusion detection systems focused on mail server activity. Where possible, disable or restrict access to the vulnerable functions until a patch is available. Conduct thorough audits of mail server configurations and user permissions to minimize attack surface. Educate users about potential phishing attempts that may arise from compromised mail content. Finally, consider deploying email encryption and digital signatures to protect mail integrity and confidentiality, reducing the impact of potential exploitation.

Description

CVE-2026-2234 is a critical vulnerability in the HGiga C&Cm@il package olln-base, characterized by missing authentication for critical functions. This flaw allows unauthenticated remote attackers to read and modify any user's mail content without requiring any privileges or user interaction. The vulnerability scores 9.3 on the CVSS 4.0 scale, reflecting its high impact on confidentiality and integrity. There are no known exploits in the wild yet, but the lack of authentication makes exploitation straightforward. European organizations using this mail package are at significant risk of data breaches and mail tampering. Mitigation requires immediate deployment of patches once available or implementing network-level access controls and monitoring. Countries with higher adoption of HGiga products and critical communication infrastructures are more likely to be targeted. Due to the critical nature and ease of exploitation, urgent attention is necessary to prevent potential compromise.

Impact

For European organizations, the impact of CVE-2026-2234 is substantial. Email systems are critical for business operations, legal communications, and sensitive data exchange. Exploitation could lead to unauthorized access to confidential information, intellectual property theft, and manipulation of email content, potentially causing reputational damage and financial loss. The ability to modify emails could facilitate sophisticated phishing campaigns or fraud by altering instructions or attachments. Regulatory compliance risks are also significant, especially under GDPR, as unauthorized access to personal data could result in heavy fines and legal consequences. The disruption of trust in email communications could impair business relationships and operational continuity. Organizations relying on HGiga’s C&Cm@il package for internal or external communications are particularly vulnerable. The absence of authentication requirements for critical functions means attackers can operate stealthily, increasing the risk of prolonged undetected breaches. This vulnerability also raises concerns for sectors with high confidentiality needs such as finance, healthcare, and government entities within Europe.

Summary

CVE-2026-2234 is a critical security vulnerability identified in the HGiga C&Cm@il package olln-base, specifically categorized under CWE-306, which denotes missing authentication for critical functions. This vulnerability allows unauthenticated remote attackers to bypass all authentication mechanisms and gain unauthorized access to read and modify any user's email content within the affected system. The vulnerability is severe, with a CVSS 4.0 base score of 9.3, indicating network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N), and high impact on both confidentiality (VC:H) and integrity (VI:H). The absence of authentication means that attackers can remotely exploit this flaw without any credentials or user involvement, making it highly exploitable. The vulnerability affects version '0' of the product, which likely refers to initial or specific releases of the HGiga C&Cm@il package olln-base. Although no public exploits have been reported yet, the critical nature and ease of exploitation make it a significant threat. The vulnerability could lead to unauthorized disclosure of sensitive email communications and unauthorized modification of email content, potentially enabling further attacks such as phishing, fraud, or espionage. The lack of patches at the time of reporting increases the urgency for organizations to implement compensating controls. The vulnerability was published on February 9, 2026, and assigned by the TWCert authority, indicating recognition by a national cybersecurity entity. Given the product's role in email communication, the vulnerability poses a direct risk to the confidentiality and integrity of organizational communications.

CWE-306Missing Authentication for Critical Function (opens in a new tab)
Base weaknessLikelihood of exploit: HighCWE Top 25 (2025): #21OWASP Top 10 A07:2025: Authentication Failures (opens in a new tab)
The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.
Architecture and Design
Divide the software into anonymous, normal, privileged, and administrative areas. Identify which of these areas require a proven user identity, and use a centralized authentication capability.
Architecture and Design
For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks…
Architecture and Design
Where possible, avoid implementing custom, "grow-your-own" authentication routines and consider using authentication capabilities as provided by the surrounding framework, operating system, or environment.
OWASP Cheat Sheets
OWASP Authentication (opens in a new tab)
OWASP ASVS 4.0.3
V1.2.3 (opens in a new tab)
V1.2.2 (opens in a new tab)
V1.2.4 (opens in a new tab)
Attack patterns
Choosing Message Identifier (opens in a new tab)
Force the System to Reset Values (opens in a new tab)
Using Unpublished Interfaces or Functionality (opens in a new tab)
Cross Site Request Forgery (opens in a new tab)
Communication Channel Manipulation (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 16 Feb 2026, 13:31 UTC

WeaknessesCWE-306

Technical details

References

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