CVE-2026-59082: Siemens SIMATIC WinCC (high)

Summary

A local attacker without logging in can make a user run arbitrary code on a device running SIMATIC WinCC, because affected devices implicitly execute active content when opening files. The attack requires the user to open a crafted file.

Read the original description

A vulnerability has been identified in SIMATIC WinCC V7.5 (All versions), SIMATIC WinCC V8.0 (All versions), SIMATIC WinCC V8.1 (All versions). Affected devices implicitly execute active content when opening files. This could allow an attacker to make the user execute arbitrary code on the device.

cve.now Index

18Pcve.now Index 18 of 100 · methodology v3 · provisional

Exploitation?/40Unknown. No CISA SSVC exploitation rating yet
Exposure5/25Specific setups only
Reach?/20Unknown. No tracked technology or package matched
Severity7.8/10CVSS 7.8
No patch5/5No patch listed yet

What would change the score

Would score about 68 if added to CISA KEV
Would score about 63 if CISA's SSVC rates exploitation active
Would score about 28 if CISA's SSVC rates it automatable

How the score works · Rankings

What to do

Check whether your setup matches what the bug needs.
Affected SIMATIC WinCC V7.5, V8.0 and V8.1 (all versions); the Graphics Designer component is affected before V8.2 The user opens a file
Workaround: Only open files from trusted sources.

Check your systems with an agent

Paste this into a coding or ops agent. It checks your systems read-only and reports a table per asset.

Check whether my systems are affected by CVE-2026-59082 (A vulnerability has been identified in SIMATIC WinCC V7.5 (All versions), SIMATIC WinCC V8.0 (All versions), SIMATIC WinCC V8.1 (All…), using the cve.now data below.

Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only.

What cve.now has for CVE-2026-59082 (entry last updated 2026-11-10):
Affected:
- Siemens SIMATIC WinCC V7.5: all versions
- Siemens SIMATIC WinCC V8.0: all versions
- Siemens SIMATIC WinCC V8.1: all versions
Fixed versions: none listed yet.
Conditions (all must be true for the bug to be hit):
- Affected SIMATIC WinCC V7.5, V8.0 and V8.1 (all versions); the Graphics Designer component is affected before V8.2 (source: https://cert-portal.siemens.com/productcert/html/ssa-979641.html)
- The user opens a file (source: https://cert-portal.siemens.com/productcert/html/ssa-979641.html)
Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory.
Attacker needs: local access, no login, a user action.
Workaround: Only open files from trusted sources. (source: https://cert-portal.siemens.com/productcert/html/ssa-979641.html)
CISA KEV: CVE-2026-59082 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-59082 only. If you also check another CVE, look up its own KEV status; never assume it from this one.

How to check:
- Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory.

Verify against the linked advisories before concluding, and cite the date you read each one:
- https://cert-portal.siemens.com/productcert/html/ssa-979641.html
Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing.

Entry: https://cve.now/CVE-2026-59082
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example get_vulnerability with id CVE-2026-59082.

Timeline

Nov 10, 2026, 11:30 AM UTCCVE published
Nov 10, 2026, 11:43 AM UTCFirst seen by cve.now

Affected versions

Siemens SIMATIC WinCC V7.5
All versions
Siemens SIMATIC WinCC V8.0
All versions
Siemens SIMATIC WinCC V8.1
All versions

Evidence 3

Vendor advisory · 1

Establishes: Affected and fixed versions.

Link
cert-portal.siemens.com · productcert/html/ssa-979641.html

CVE record · 2

Establishes: The identifier and description.

Record
CVE List · CVE-2026-59082
Record
NVD · CVE-2026-59082

Corrections

None so far.

Something wrong on this page? Report an error. Every fix is listed here.

Questions about CVE-2026-59082

Is CVE-2026-59082 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data

What does this mean?

Graphics Designer runs active content implicitly when a file is opened, without a separate warning. An attacker could use this to run arbitrary code on the device.Source: cert-portal.siemens.com

Which versions are affected by CVE-2026-59082?

SIMATIC WinCC V7.5: all versions. SIMATIC WinCC V8.0: all versions. SIMATIC WinCC V8.1: all versions.Source: cve.now feed data

Am I affected, and how do I check?

All versions of SIMATIC WinCC V7.5, V8.0 and V8.1 are listed, and the Graphics Designer component is affected before V8.2. Check the installed WinCC version and whether Graphics Designer is part of the installation.Source: cert-portal.siemens.com

How do I fix CVE-2026-59082?

No fixed version is listed yet, so there is no upgrade target. Until a fix is released, follow the workaround of opening only files from trusted sources.Source: cert-portal.siemens.com

What if there's no patch?

Only open files from trusted sources. Siemens states that currently no fix is available.Source: cert-portal.siemens.com

A vulnerability has been identified in SIMATIC WinCC V7.5 (All versions), SIMATIC WinCC V8.0 (All versions), SIMATIC WinCC V8.1 (All…