CVE-2026-27661VulnerabilityPublished 10 Mar 2026

CVE-2026-27661: Siemens SINEC Security Monitor · Exposure of Sensitive Information Through Metadata

Affects Siemens SINEC Security MonitorSource CVE Database V5

Not known to be exploited · CVSS 4.3 Medium : upgrade to 4.9.0 when convenient.

Data as of 25 Oct 2026, 19:02 UTC

CVSS 3.1 base score

4.3Medium

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

EPSS: 0.2% chance of exploitation in 30 days – higher than 18% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 4.9.0

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

Attack Vector: Network
Attack Complexity: Low
Privileges Required: Low
User Interaction: None
Scope: Unchanged
Confidentiality: Low
Integrity: None
Availability: None

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

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, 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: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: Low: The attacker is authorized with (i.e., requires) privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges may have the ability to cause an impact only to non-sensitive resources.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 10 Mar 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 2026-10-25.

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 Siemens SINEC Security Monitor to 4.9.0.

Affected software

Product	Affected	Fixed in
SiemensSINEC Security Monitor	Affected <4.9.0	Fixed in 4.9.0

AI-suggested

1. Upgrade Siemens SINEC Security Monitor to version 4.9.0 or later once the patch is released to eliminate the metadata exposure. 2. If you cannot patch yet, restrict network access to the SSM Server using firewalls and network segmentation to limit exposure to trusted users only. 3. Implement strict access controls and authentication mechanisms to ensure only authorized personnel can access the SSM Server and its metadata. 4. Monitor logs and network traffic for unusual access patterns or metadata extraction attempts. 5. Educate staff about phishing and social engineering risks that could arise from leaked personnel information. 6. Conduct regular security assessments and audits of industrial monitoring systems to identify and remediate similar metadata leakage issues. 7. Coordinate with Siemens support for any interim mitigation advice or workarounds.

Description

A vulnerability has been identified in SINEC Security Monitor (All versions < V4.9.0). The affected application leaks confidential information in metadata, and files such as information on contributors and email address, on `SSM Server`.

Impact

The primary impact of CVE-2026-27661 is the unauthorized disclosure of sensitive metadata, which compromises confidentiality. Although it does not directly affect system integrity or availability, the leaked information can be leveraged by attackers to conduct more effective reconnaissance, social engineering, or phishing attacks against personnel associated with the SSM Server. Organizations relying on Siemens SINEC Security Monitor in critical infrastructure, manufacturing, or industrial environments could face increased risk of targeted attacks. The exposure of contributor names and email addresses may also lead to reputational damage and privacy concerns. Since exploitation requires network access and low privileges, internal threat actors or attackers who have gained initial footholds could exploit this vulnerability to escalate their reconnaissance capabilities. The absence of known exploits reduces immediate risk but does not eliminate the threat, especially as the vulnerability becomes publicly known.

CWE-1230Exposure of Sensitive Information Through Metadata (opens in a new tab)
Base weakness
The product prevents direct access to a resource containing sensitive information, but it does not sufficiently limit access to metadata that is derived from the original, sensitive information.
OWASP ASVS 4.0.3
V8.3.8 (opens in a new tab)
V13.4.2 (opens in a new tab)
V7.2.2 (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

cert-portal.siemens.com/productcert/html/ssa-430425.html (opens in a new tab)

Community reviews

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 10 Mar 2026, 17:05 UTC

WeaknessesCWE-1230

Technical details

References

Community reviews

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