Page generated: 10 Nov 2026, 19:10 UTC
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CVE-2026-21513

Protection mechanism failure in MSHTML Framework allows an unauthorized attacker to bypass a security feature over a network.

CVSS 8.8 (HIGH) KEV: KNOWN CATALOG

Attention and evidence

HYPE SCORE
0.0/10
REALITY · THREAT PRIORITY
8.4/10
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: 15.85%: +0.08

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

Sources: 25 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

BleepingComputer
Press · 29 Apr 2026, 07:00 · CISA orders feds to patch Windows flaw exploited as zero-day - BleepingComputer
The Register
Press · 29 Apr 2026, 07:00 · Microsoft's patch for a 0-day exploited by Russian spies fell short. Another Windows flaw is under attack - The Register
Help Net Security
Press · 29 Apr 2026, 07:00 · CISA, Microsoft warn of active exploitation of Windows Shell vulnerability (CVE-2026-32202) - Help Net Security
CyberSecurityNews
Press · 28 Apr 2026, 07:00 · New Windows 0-Click Vulnerability Exploited to Bypass Defender SmartScreen - CyberSecurityNews
The Hacker News
Press · 28 Apr 2026, 07:00 · Microsoft Confirms Active Exploitation of Windows Shell CVE-2026-32202 - The Hacker News
See all 25 source documents
SecurityWeek
Press · 27 Apr 2026, 07:00 · Incomplete Windows Patch Opens Door to Zero-Click Attacks - SecurityWeek
Recorded Future
Press · 12 Mar 2026, 07:00 · February 2026 CVE Landscape: 13 Critical Vulnerabilities Mark 43% Drop from January - Recorded Future
The Hacker News
Press · 02 Mar 2026, 08:00 · APT28 Tied to CVE-2026-21513 MSHTML 0-Day Exploited Before Feb 2026 Patch Tuesday - The Hacker News
Security Affairs
Press · 02 Mar 2026, 08:00 · Russia-linked APT28 exploited MSHTML zero-day CVE-2026-21513 before patch - Security Affairs
Akamai
Press · 20 Feb 2026, 08:00 · Inside the Fix: Analysis of In-the-Wild Exploit of CVE-2026-21513 - Akamai
Qualys
Press · 11 Feb 2026, 08:00 · Microsoft and Adobe Patch Tuesday, February 2026 Security Update Review - Qualys
Infosecurity Magazine
Press · 11 Feb 2026, 08:00 · Microsoft Fixes Six Zero Day Vulnerability in February Patch Tuesday - Infosecurity Magazine
Help Net Security
Press · 11 Feb 2026, 08:00 · Microsoft Patch Tuesday: 6 exploited zero-days fixed in February 2026 - Help Net Security
Malwarebytes
Press · 11 Feb 2026, 08:00 · February 2026 Patch Tuesday includes six actively exploited zero-days - Malwarebytes
Rapid7
Press · 11 Feb 2026, 08:00 · Patch Tuesday - February 2026 - Rapid7
Forbes
Press · 11 Feb 2026, 08:00 · Microsoft Triple Warning — 3 Windows Security Bypass Threats Confirmed - Forbes
The Hacker News
Press · 11 Feb 2026, 08:00 · Microsoft Patches 59 Vulnerabilities Including Six Actively Exploited Zero-Days - The Hacker News
SecurityWeek
Press · 10 Feb 2026, 08:00 · 6 Actively Exploited Zero-Days Patched by Microsoft With February 2026 Updates - SecurityWeek
CyberSecurityNews
Press · 10 Feb 2026, 08:00 · Microsoft Patch Tuesday February 2026 – 54 Vulnerabilities Fixed, Including 6 Zero-days - CyberSecurityNews
BleepingComputer
Press · 10 Feb 2026, 08:00 · Microsoft February 2026 Patch Tuesday fixes 6 zero-days, 58 flaws - BleepingComputer
Krebs on Security
Press · 10 Feb 2026, 08:00 · Patch Tuesday, February 2026 Edition - Krebs on Security
thezdi.com
Press · 10 Feb 2026, 08:00 · The February 2026 Security Update Review - thezdi.com
Cisco Talos Blog
Press · 10 Feb 2026, 08:00 · Microsoft Patch Tuesday for February 2026 — Snort rules and prominent vulnerabilities - Cisco Talos Blog
Dark Reading
Press · 10 Feb 2026, 08:00 · Microsoft Patches 6 Actively Exploited Zero-Days - Dark Reading
Arctic Wolf
Press · 10 Feb 2026, 08:00 · Microsoft Patch Tuesday: February 2026 - Arctic Wolf

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 8.4 (2026-11-02 15:14). 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 15.9%
Attention, last 30 days
0 distinct story titles; 0 press documents; 0 publisher domains.
Technical potential
network access, no prior 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 14:00:01.230559+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline
Added to the CISA KEV catalog
10 Feb 2026, 00:00
First press mention
10 Feb 2026, 08:00
Published
10 Feb 2026, 17:51
Latest press mention
29 Apr 2026, 07:00
Score calculated
05 Nov 2026, 14:00