VulnRadar

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Page generated: 11 Nov 2026, 09:42 UTC

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CVE-2021-26829

OpenPLC ScadaBR through 0.9.1 on Linux and through 1.12.4 on Windows allows stored XSS via system_settings.shtm.

CVSS 5.4 (MEDIUM) KEV: KNOWN CATALOG

Attention and evidence

HYPE SCORE

0.0/10

REALITY · THREAT PRIORITY

8.1/10

General review priority; not probability

Evidence confidence: Exploitation recorded

Why this priority?

Recorded exploitation baseline: +7.00
Technical severity: CVSS 5.4: +0.81
Fresh EPSS: 48.05%: +0.24

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

Sources: 9 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 · 09 Dec 2025, 08:00 · November 2025 CVE Landscape: 10 Critical Vulnerabilities Show 69% Drop from October - Recorded Future

Cyber Daily

Press · 05 Dec 2025, 08:00 · Second ScadaBR vulnerability added to Known Exploited Vulnerability Catalog - Cyber Daily

Industrial Cyber

Press · 02 Dec 2025, 08:00 · OpenPLC ScadaBR added to CISA’s known exploited list after confirmed attacks - Industrial Cyber

Security Affairs

Press · 01 Dec 2025, 08:00 · U.S. CISA adds an OpenPLC ScadaBR flaw to its Known Exploited Vulnerabilities catalog - Security Affairs

SecurityWeek

Press · 01 Dec 2025, 08:00 · CISA Warns of ScadaBR Vulnerability After Hacktivist ICS Attack - SecurityWeek

See all 9 source documents

Cyber Daily

Press · 01 Dec 2025, 08:00 · CISA adds 4-year-old ScadaBR vulnerability to KEV catalogue - Cyber Daily

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

The Register

Press · 10 Oct 2025, 07:00 · Pro-Russia hacktivist group dies of cringe after falling into researchers' trap - The Register

BleepingComputer

Press · 09 Oct 2025, 07:00 · Hacktivists target critical infrastructure, hit decoy plant - BleepingComputer

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 8.1 (2026-11-02 15:12). The curve appears once the score changes.

Public exploit evidence

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 5.4; EPSS 48.0%
Attention, last 30 days: 0 distinct story titles; 0 press documents; 0 publisher domains.
Technical potential: network access, low privileges, 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, 11:05

First press mention

09 Oct 2025, 07:00

Added to the CISA KEV catalog

28 Nov 2025, 00:00

Latest press mention

09 Dec 2025, 08:00

Score calculated

05 Nov 2026, 13:58