Is CVE-2026-25786 actively exploited?

No active exploitation of CVE-2026-25786 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-25786 be exploited remotely?

Yes. CVE-2026-25786 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-25786?

CVE-2026-25786 has a CVSS score of 9.1 (CRITICAL).

HOME VULNERABILITIESCVE-2026-25786

CRITICAL

CVE-2026-25786

CWE-79Published: May 12, 2026· Updated: May 12, 2026

9.1

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:13.4th

Official Description

Affected devices do not properly validate and sanitize PLC/station name rendered on the "communication" parameters page of the web interface.

This could allow an authenticated attacker who is authorized to download a TIA project into the product, to inject malicious scripts into the page.

If a benign user with appropriate rights accesses the "communication" parameters page, the malicious code would be executed in the scope of their web session.

NVD Source

Technical Analysis

CVE-2026-25786 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires high privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.1.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.

From a weakness classification perspective (CWE-79): Cross-site scripting (XSS) vulnerabilities allow attackers to inject malicious scripts into web pages viewed by other users.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.High

User InteractionNone

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

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News & Research Mentioning CVE-2026-25786

Siemens SIMATIC S7 PLC Web Server

CISA Alerts· May 14, 2026

View CSAF Summary SIMATIC S7 PLCs contain multiple vulnerabilities in the web server that could allow an attacker to perform cross-site scripting attacks. Siemens has released new versions for several affected products and recommends to update to the latest versions. Siemens is preparing further fix versions and recommends specific countermeasures for products where fixes are not, or not yet available. The following versions of Siemens SIMATIC S7 PLC Web Server are affected: SIMATIC Drive Controller CPU 1504D TF (6ES7615-4DF10-0AB0) vers:intdot/<3.1.6 (CVE-2026-25786, CVE-2026-25787, CVE-2026-25789) SIMATIC Drive Controller CPU 1507D TF (6ES7615-7DF10-0AB0) vers:intdot/<3.1.6 (CVE-2026-25786, CVE-2026-25787, CVE-2026-25789) SIMATIC ET 200SP CPU 1510S [xlite_meta score:73 src:CISA Alerts xlite_fp:ef3a512b496625a23af31ebb67fe8fd2aad71c418ba35d35bcb0eefd14a5a88b]