Page generated: 09 Nov 2026, 12:51 UTC
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CVE-2021-26828

OpenPLC ScadaBR through 0.9.1 on Linux and through 1.12.4 on Windows allows remote authenticated users to upload and execute arbitrary JSP files via view_edit.shtm.

CVSS 8.8 (HIGH) KEV: KNOWN CATALOG

Attention and evidence

HYPE SCORE
0.0/10
REALITY · THREAT PRIORITY
8.5/10
General review priority; not probability

Evidence confidence: Exploitation recorded

Why this priority?
  • Recorded exploitation baseline: +7.00
  • Technical severity: CVSS 8.8: +1.32
  • Fresh EPSS: 39.10%: +0.20

General review priority, not probability, victim count or asset-specific risk. A range covers missing CVSS/EPSS inputs within the current evidence state.

Sources: 7 documents and public datasets.

Hype components

Headline sample (25%)
0/100
Press, 30 days (60%)
0/100
Grounded branding (15%)
0/100
HYPE TOTAL0/100

Sources and documents

Recorded Future
Press · 13 Jan 2026, 08:00 · December 2025 CVE Landscape: 22 Critical Vulnerabilities Mark 120% Surge, React2Shell Dominates Threat Activity - Recorded Future
Cyber Daily
Press · 05 Dec 2025, 08:00 · Second ScadaBR vulnerability added to Known Exploited Vulnerability Catalog - Cyber Daily
CyberSecurityNews
Press · 04 Dec 2025, 08:00 · CISA Warns of OpenPLC ScadaBR File Upload Vulnerability Exploited in Attacks - CyberSecurityNews
Industrial Cyber
Press · 02 Dec 2025, 08:00 · OpenPLC ScadaBR added to CISA’s known exploited list after confirmed attacks - Industrial Cyber
SecurityWeek
Press · 01 Dec 2025, 08:00 · CISA Warns of ScadaBR Vulnerability After Hacktivist ICS Attack - SecurityWeek
See all 7 source documents
The Hacker News
Press · 30 Nov 2025, 08:00 · CISA Adds Actively Exploited XSS Bug CVE-2021-26829 in OpenPLC ScadaBR to KEV - The Hacker News
Industrial Cyber
Press · 10 Oct 2025, 07:00 · Forescout exposes TwoNet hacktivists targeting water utility honeypot in latest OT cyberattack findings - Industrial Cyber

Score evolution

● Hype   ● Reality

Earlier evidence-support scores are retained in history; this chart shows only the current priority definition.

First record: hype 0.0 · reality 8.5 (2026-11-02 15:12). The curve appears once the score changes.

Public exploit evidence

0

Public exploit entries / repo candidates

Evidence context and dated references

Reality is general threat/review priority, combining observed exploitation, CVSS severity and fresh EPSS. Evidence confidence is separate. This is not calibrated risk, a victim count or an asset-specific assessment. A range reflects missing numeric inputs.

Evidence in context

Confidence in exploitation evidence
Exploitation recorded
Priority basis
Recorded exploitation; CVSS 8.8; EPSS 39.1%
Attention, last 30 days
0 distinct story titles; 0 press documents; 0 publisher domains.
Technical potential
network access, low privileges, no user interaction.
Observed activity
Exploitation recorded in CISA KEV.
Known scale
Not quantified.
Evidence confidence basis
Trusted exploitation confirmation

Score evaluated: 2026-11-05 13:58:24.835925+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline
Published
11 Jun 2021, 11:10
First press mention
10 Oct 2025, 07:00
Added to the CISA KEV catalog
03 Dec 2025, 00:00
Latest press mention
13 Jan 2026, 08:00
Score calculated
05 Nov 2026, 13:58