CVE-2026-3869Patch

LOWCVSS 9.2 · CRITICAL

Signal is active with 2 mentions in latest observed window

Immediate actions

Patch affected systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

CWE-303 : Incorrect Implementation of Authentication Algorithm vulnerability exists that could cause loss of confidentiality, integrity and availability of the PLC provided an application project with a lower application level is running on the PLC.

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0.5/ 10 priority

Sources & remediation

Other references

https://download.se.com/files?p_Doc_Ref=SEVD-2026-251-04&p_enDocType=Security+and+Safety+Notice&p_File_Name=SEVD-2026-251-04.pdf

Weakness type (CWE)

CWE-303

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

NONE

Threat summary

Patch or workaround signal is available
2 mentions across 1 observed day

What's happening

Patch or workaround mentioned in 2 signals
Technical details provided in 1 signal
2 total mentions across 1 day

Deep dive

Activity timeline2 mentions / 1d

Signal classification1 categories

Patch

2100.0%

Referenced assets2 URLs

By indicator

Full discourse2 posts

Cybersecurity News Everyday@TweetThreatNews45d
Patch
Schneider Electric, Siemens, and Aveva issued September Patch Tuesday advisories for ICS products, fixing critical flaws including CVE-2026-3869 in Modicon M580 and CVE-2026-31431 in the Linux kernel. #SchneiderElectric #Siemens #ICS https://www.hendryadrian.com/ics-patch-tuesday-schneider-electric-siemens-fix-critical-flaws/
Post summary
The post announces that Schneider Electric, Siemens, and Aveva released Patch Tuesday advisories fixing critical CVEs in Modicon M580 and the Linux kernel, without providing PoC or exploitation details.
00011314
4.7K followersView on X
Venkata Satish Guttula 🛰️@snakeyesV145d
Patch
News: Schneider Electric, Siemens, and Aveva ship ICS Patch Tuesday. Worst new hit: Modicon M580 auth CVE-2026-3869 (CVSS 9.2). Siemens flags critical Reyrolle 7SR5, OIS, Industrial Edge bugs. OT owners: patch controllers now. https://www.securityweek.com/ics-patch-tuesday-schneider-electric-siemens-fix-critical-flaws/
Post summary
The article announces the discovery of CVE‑2026‑3869, an authentication flaw with CVSS 9.2, and urges OT owners to patch affected Modicon M580 controllers; no PoC, exploit code, or active exploitation claims are mentioned.
00020127
3.1K followersView on X

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