VulnerabilityPublished 12 May 2026Updated 14 Jul 2026

CVE-2026-25789: Siemens SIMATIC Drive Controller CPU 1504D TF · Cross-site Scripting

Affects Siemens SIMATIC Drive Controller CPU 1504D TFSource CVE Database V5

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Not known to be exploited · CVSS 7.1 High : upgrade to 3.1.6 soon.

Data as of 30 Oct 2026, 06:59 UTC

CVSS 3.1 base score

7.1High

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

EPSS: 0.2% chance of exploitation in 30 days – higher than 19% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 3.1.6, 2.9.9, 4.1.6

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

Attack Vector: Network
Attack Complexity: High
Privileges Required: Low
User Interaction: Required
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High

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: High: A successful attack depends on conditions beyond the attacker's control. That is, a successful attack cannot be accomplished at will, but requires the attacker to invest in some measurable amount of effort in preparation or execution against the vulnerable component before a successful attack can be expected. For example, a successful attack may require an attacker to: gather knowledge about the environment in which the vulnerable target/component exists; prepare the target environment to improve exploit reliability; or inject themselves into the logical network path between the target and the resource requested by the victim in order to read and/or modify network communications (e.g., a man in the middle attack).
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: Required: Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited.
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: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
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 impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component.
Availability: High: There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 12 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 29 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.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity 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 SIMATIC Drive Controller CPU 1504D TF and SIMATIC Drive Controller CPU 1507D TF and SIMATIC S7-1500 CPU 1516T-3 PN/DP and SIMATIC S7-1500 CPU 1516TF-3 PN/DP and SIMATIC S7-1500 CPU 1517-3 PN/DP and SIMATIC S7-1500 CPU 1517F-3 PN/DP and SIMATIC S7-1500 CPU 1517T-3 PN/DP and SIMATIC S7-1500 CPU 1517TF-3 PN/DP and SIMATIC S7-1500 CPU 1518-4 PN/DP and SIMATIC S7-1500 CPU 1518-4 PN/DP MFP and SIMATIC S7-1500 CPU 1518F-4 PN/DP and SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP and SIMATIC S7-1500 CPU 1518T-4 PN/DP and SIMATIC S7-1500 CPU 1518TF-4 PN/DP and SIPLUS S7-1500 CPU 1518-4 PN/DP and SIPLUS S7-1500 CPU 1518-4 PN/DP MFP and SIPLUS S7-1500 CPU 1518F-4 PN/DP to 3.1.6; SIMATIC ET 200SP CPU 1510SP F-1 PN and SIMATIC ET 200SP CPU 1510SP-1 PN and SIMATIC ET 200SP CPU 1512SP F-1 PN and SIMATIC ET 200SP CPU 1512SP-1 PN and SIMATIC S7-1500 CPU 1511-1 PN and SIMATIC S7-1500 CPU 1511C-1 PN and SIMATIC S7-1500 CPU 1511F-1 PN and SIMATIC S7-1500 CPU 1511T-1 PN and SIMATIC S7-1500 CPU 1511TF-1 PN and SIMATIC S7-1500 CPU 1512C-1 PN and SIMATIC S7-1500 CPU 1513-1 PN and SIMATIC S7-1500 CPU 1513F-1 PN and SIMATIC S7-1500 CPU 1515-2 PN and SIMATIC S7-1500 CPU 1515F-2 PN and SIMATIC S7-1500 CPU 1515T-2 PN and SIMATIC S7-1500 CPU 1515TF-2 PN and SIMATIC S7-1500 CPU 1516-3 PN/DP and SIMATIC S7-1500 CPU 1516F-3 PN/DP and SIMATIC S7-1500 ET 200pro: CPU 1513PRO F-2 PN and SIMATIC S7-1500 ET 200pro: CPU 1513PRO-2 PN and SIMATIC S7-1500 ET 200pro: CPU 1516PRO F-2 PN and SIMATIC S7-1500 ET 200pro: CPU 1516PRO-2 PN and SIPLUS ET 200SP CPU 1510SP F-1 PN and SIPLUS ET 200SP CPU 1510SP F-1 PN RAIL and SIPLUS ET 200SP CPU 1510SP-1 PN and SIPLUS ET 200SP CPU 1510SP-1 PN RAIL and SIPLUS ET 200SP CPU 1512SP F-1 PN and SIPLUS ET 200SP CPU 1512SP F-1 PN RAIL and SIPLUS ET 200SP CPU 1512SP-1 PN and SIPLUS ET 200SP CPU 1512SP-1 PN RAIL and SIPLUS S7-1500 CPU 1511-1 PN and SIPLUS S7-1500 CPU 1511-1 PN T1 RAIL and SIPLUS S7-1500 CPU 1511-1 PN TX RAIL and SIPLUS S7-1500 CPU 1511F-1 PN and SIPLUS S7-1500 CPU 1513-1 PN and SIPLUS S7-1500 CPU 1513F-1 PN and SIPLUS S7-1500 CPU 1515F-2 PN and SIPLUS S7-1500 CPU 1515F-2 PN RAIL and SIPLUS S7-1500 CPU 1515F-2 PN T2 RAIL and SIPLUS S7-1500 CPU 1516-3 PN/DP and SIPLUS S7-1500 CPU 1516-3 PN/DP RAIL and SIPLUS S7-1500 CPU 1516-3 PN/DP TX RAIL and SIPLUS S7-1500 CPU 1516F-3 PN/DP and SIPLUS S7-1500 CPU 1516F-3 PN/DP RAIL to 2.9.9; SIMATIC ET 200SP CPU 1510SP F-1 PN and SIMATIC ET 200SP CPU 1510SP-1 PN and SIMATIC ET 200SP CPU 1512SP F-1 PN and SIMATIC ET 200SP CPU 1512SP-1 PN and SIMATIC ET 200SP CPU 1514SP F-2 PN and SIMATIC ET 200SP CPU 1514SP-2 PN and SIMATIC ET 200SP CPU 1514SPT F-2 PN and SIMATIC ET 200SP CPU 1514SPT-2 PN and SIMATIC S7-1500 CPU 1511-1 PN and SIMATIC S7-1500 CPU 1511C-1 PN and SIMATIC S7-1500 CPU 1511F-1 PN and SIMATIC S7-1500 CPU 1511T-1 PN and SIMATIC S7-1500 CPU 1511TF-1 PN and SIMATIC S7-1500 CPU 1512C-1 PN and SIMATIC S7-1500 CPU 1513-1 PN and SIMATIC S7-1500 CPU 1513F-1 PN and SIMATIC S7-1500 CPU 1513pro F-2 PN and SIMATIC S7-1500 CPU 1513pro-2 PN and SIMATIC S7-1500 CPU 1515-2 PN and SIMATIC S7-1500 CPU 1515F-2 PN and SIMATIC S7-1500 CPU 1515T-2 PN and SIMATIC S7-1500 CPU 1515TF-2 PN and SIMATIC S7-1500 CPU 1516-3 PN/DP and SIMATIC S7-1500 CPU 1516F-3 PN/DP and SIMATIC S7-1500 CPU 1516pro F-2 PN and SIMATIC S7-1500 CPU 1516pro-2 PN and SIMATIC S7-1500 CPU 1516T-3 PN and SIMATIC S7-1500 CPU 1516TF-3 PN and SIMATIC S7-1500 CPU 1517-3 PN and SIMATIC S7-1500 CPU 1517F-3 PN and SIMATIC S7-1500 CPU 1517T-3 PN and SIMATIC S7-1500 CPU 1517TF-3 PN and SIMATIC S7-1500 CPU 1518-3 PN and SIMATIC S7-1500 CPU 1518F-3 PN and SIMATIC S7-1500 CPU 1518T-3 PN and SIMATIC S7-1500 CPU 1518TF-3 PN to 4.1.6.

Affected software

Product	Affected	Fixed in
SiemensSIMATIC Drive Controller CPU 1504D TF	Affected <3.1.6	Fixed in 3.1.6
SiemensSIMATIC Drive Controller CPU 1507D TF	Affected <3.1.6	Fixed in 3.1.6
SiemensSIMATIC ET 200SP CPU 1510SP F-1 PN	Affected All versions	Fixed in–
SiemensSIMATIC ET 200SP CPU 1510SP F-1 PN	Affected <2.9.9	Fixed in 2.9.9
SiemensSIMATIC ET 200SP CPU 1510SP F-1 PN	Affected <4.1.6	Fixed in 4.1.6
SiemensSIMATIC ET 200SP CPU 1510SP-1 PN	Affected All versions	Fixed in–

AI-suggested

If you cannot patch yet, users should exercise caution when interacting with firmware update filenames and avoid selecting files from untrusted sources.

Description

Affected devices do not properly validate and sanitize filenames on the Firmware Update page. This could allow a remote attacker to social engineer the user into selecting the modified firmware file to be uploaded. This would result in malitcious JavaScript execution in the context of the authenticated user's session without requiring the file to be uploaded, potentially leading to session hijacking or credential theft.

Impact

Successful exploitation can result in execution of arbitrary JavaScript in the context of an authenticated user's session, potentially leading to session hijacking and credential theft. The vulnerability requires user interaction (UI:R) and low privileges (PR:L) but can have high impact on confidentiality, integrity, and availability.

Summary

CVE-2026-25789 is a cross-site scripting vulnerability (CWE-79) in Siemens SIMATIC Drive Controller CPU 1504D TF. The issue arises from insufficient validation and sanitization of filenames on the Firmware Update page, allowing an attacker to craft filenames containing malicious JavaScript. When an authenticated user interacts with the modified filename, the script executes in their session context without needing the file to be uploaded. This can lead to session hijacking or credential theft. The vulnerability has a CVSS 3.1 base score of 7.1 (AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H).

CWE-79Improper Neutralization of Input During Web Page Generation (Cross-site Scripting) (opens in a new tab)
Base weaknessLikelihood of exploit: HighCWE Top 25 (2025): #1OWASP Top 10 A05:2025: Injection (opens in a new tab)
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
Architecture and Design · Libraries or Frameworks
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
Implementation · Architecture and Design
Understand the context in which your data will be used and the encoding that will be expected. This is especially important when transmitting data between different components, or when generating outputs that can contain multiple encodings at the same time, such as web pages or multi-part mail messages.
Architecture and Design · Implementation · Attack Surface Reduction
Understand all the potential areas where untrusted inputs can enter your software: parameters or arguments, cookies, anything read from the network, environment variables, reverse DNS lookups, query results, request headers, URL components, e-mail, files, filenames, databases, and any external systems that provide…
OWASP Cheat Sheets
Cross Site Scripting Prevention (opens in a new tab)
DOM based XSS Prevention (opens in a new tab)
Injection Prevention (opens in a new tab)
Abuse Case (opens in a new tab)
Deserialization (opens in a new tab)
OWASP ASVS 4.0.3
V5.3.3 (opens in a new tab)
V1.5.1 (opens in a new tab)
Attack patterns
XSS Using MIME Type Mismatch (opens in a new tab)
DOM-Based XSS (opens in a new tab)
Reflected XSS (opens in a new tab)
Stored XSS (opens in a new tab)
Cross-Site Scripting (XSS) (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

cert-portal.siemens.com/productcert/html/ssa-688146.html (opens in a new tab)

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 15 Jul 2026, 11:31 UTC

WeaknessesCWE-79

Technical details

References

Community reviews

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