CVE-2026-33862Public exploitNetwork attack vector

Cross-user JavaScript execution via attachment filenames

Published May 12, 2026 · Updated May 12, 2026

Stored cross-site scripting in Siemens Teamcenter allows remote authenticated users to execute JavaScript in other users' browsers. The attachments table renders an uploaded file's attacker-controlled name in the References column without context-appropriate output encoding. A low-privileged user must attach the crafted file to an object, and another user must open the Files view in Table mode, exposing that user's Teamcenter session and actions.

CVSS severity8.5
High
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in Siemens Teamcenter allows remote authenticated users to execute JavaScript in other users' browsers. The attachments table renders an uploaded file's attacker-controlled name in the References column without context-appropriate output encoding. A low-privileged user must attach the crafted file to an object, and another user must open the Files view in Table mode, exposing that user's Teamcenter session and actions.

The record

CVE
CVE-2026-33862
Published
May 12, 2026
Updated
May 12, 2026
Vendor
Siemens
Product
Teamcenter
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 12, 2026CVE publishedPublication date reported by the CVE source.
  2. May 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=0 <V2312.0014
  2. Affected versionversion=0 <V2406.0012
  3. Affected versionversion=0 <V2412.0009
  4. Affected versionversion=0 <V2506.0005

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Siemens · Teamcenterversion=0 <V2312.0014; version=0 <V2406.0012; version=0 <V2412.0009; version=0 <V2506.0005

Published CVSS scores

7.3Siemens ProductCERTCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
8.5Siemens ProductCERTCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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