CWE-787 Out-of-bounds write vulnerability exists that could cause loss of data or potentially risk arbitrary code execution when a maliciou…

published 2026-07-29 3 mo ago modified 2026-10-23 16 d ago also EUVD-2026-50304

cvss: 8.4; version 4.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 8%
public exploits: 0; none known

CWE-787 Out-of-bounds write vulnerability exists that could cause loss of data or potentially risk arbitrary code execution when a malicious CGF file is imported to IGSS Definition.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-26-211-04 updated 2026-07-30 cvss 7.8

Schneider Electric IGSS

Schneider Electric IGSS IGSS Definition (Def.exe) module <= 18.0.0.26124
affected: vendor fix, mitigation igss.schneider-electric.com
Schneider Electric IGSS IGSS Definition (Def.exe) module 18.0.0.26125
fixed

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 3 mo ago (2026-07-29)

Exploit prediction

0.18% chance of exploitation in the next 30 days, higher than 8% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	4.0	8.4	CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CNA	4.0	8.4	CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

Schneider Electric IGSS Definition (Def.exe)

Classification

Weakness

CWE-787 Out-of-bounds Write

References

download.se.com /files?p_Doc_Ref=SEVD-2026-195-01&p_enDocType=Security+and+Safety+Notice&p_File_Name=SEVD-2026-195-01.pdf

Sources

CVE List CVE-2026-12927
NVD CVE-2026-12927

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary