CVE-2026-85115Hinoki check available

Password disclosure via incomplete HTTP-error redaction

Published Oct 13, 2026 · Updated Oct 13, 2026

Password disclosure in Siemens SIMATIC S7 Webserver API .NET Client Library before 3.3.62 allows attackers to read passwords via error output. ApiResponseChecker.CheckHttpResponseForErrors embeds the serialized restore request in an exception because its redaction checks match login and password-change names but miss backup restore. Disclosure requires an HTTP error during restore and access to the resulting logs or diagnostic output; the exposed secret is the plaintext PLC restore password.

CVSS severityUnavailable
Unscored
EPSS probability0.15%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Password disclosure in Siemens SIMATIC S7 Webserver API .NET Client Library before 3.3.62 allows attackers to read passwords via error output. ApiResponseChecker.CheckHttpResponseForErrors embeds the serialized restore request in an exception because its redaction checks match login and password-change names but miss backup restore. Disclosure requires an HTTP error during restore and access to the resulting logs or diagnostic output; the exposed secret is the plaintext PLC restore password.

The record

CVE
CVE-2026-85115
Published
Oct 13, 2026
Updated
Oct 13, 2026
Vendor
Siemens
Product
SIMATIC S7 Webserver API .NET Client Library
Classifications
T1552.001
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <V3.3.62

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

Siemens · SIMATIC S7 Webserver API .NET Client Libraryversion=0 <V3.3.62

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

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No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1552.001Credentials In Files

Public exploit references

No public exploit references are available in this record.

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Technologies

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