CVE-2018-7831

mediumpriority · track · 35EPSS 0.006 · 50 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.64% (50th) EPSS

CVSS 4.3 · medium

Is it mine?

9 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · nvd

EPSS · scored 2026-10-27

An Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) vulnerability exists in the embedded web servers in all Modicon M340, Premium, Quantum PLCs and BMXNOR0200 allowing an attacker to send a specially crafted URL to a currently authenticated web server user to execute a password change on the web server.

cvss

Technical severity, 0–10. One row per scoring source.

8.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 4.3–8.8

v2.04.3mediumAV:N/AC:M/Au:N/C:N/I:P/A:Nprimary · NVD / NIST USexploitability 8.6 · impact 2.9

v3.08.8highCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 2.8 · impact 5.9

v3.08.1highCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

v3.15.4mediumAV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:Lsecondary · FSTEC (BDU) RU

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-352USprimaryCWE-79USprimaryCWE-80US

affected products (9)

Products and version ranges known to be affected.

Schneider Electric SE Embedded Web Servers in all Modicon M340, Premium, Quantum PLCs and BMXNOR0200≤ Embedded Web Servers in all Modicon M340, Premium, Quantum PLCs and BMXNOR0200enisa_euvdEU
Schneider Electric Modicon BMXNOR0200all versionsfstec_bduRU
Schneider Electric Modicon M340all versionsfstec_bduRU
Schneider Electric Modicon Premiumall versionsfstec_bduRU
Schneider Electric Modicon Quantumall versionsfstec_bduRU
schneider-electric modicom bmxnor0200h firmwareall versionsnvdUScpe:2.3:o:schneider-electric:modicom_bmxnor0200h_firmware:*:*:*:*:*:*:*:*
schneider-electric modicom m340 firmwareall versionsnvdUScpe:2.3:o:schneider-electric:modicom_m340_firmware:*:*:*:*:*:*:*:*
schneider-electric modicom premium firmwareall versionsnvdUScpe:2.3:o:schneider-electric:modicom_premium_firmware:*:*:*:*:*:*:*:*
schneider-electric modicom quantum firmwareall versionsnvdUScpe:2.3:o:schneider-electric:modicom_quantum_firmware:*:*:*:*:*:*:*:*

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu nvd NVD CVE.org MITRE

published 2018-11-30modified 2026-06-17

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+63162 more

references (7)

External citations — patches, advisories, analysis.

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