Page generated: 09 Nov 2026, 13:35 UTC
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CVE-2026-58644

Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.

CVSS 9.8 (CRITICAL) 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 9.8: +1.47
  • Fresh EPSS: 15.87%: +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: 28 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

Forkast News
Press · 20 Sep 2026, 07:00 · The Patch Is Not Enough: SharePoint’s ToolShell Chain Steals Keys That Outlive the Fix - Forkast News
The Hacker News
Press · 13 Aug 2026, 07:00 · Attackers Exploit SharePoint Authentication Bypass After Public PoC Release - The Hacker News
JPCERT コーディネーションセンター
Press · 31 Jul 2026, 07:00 · [Updated] Microsoft Releases July 2026 Security Updates - JPCERT コーディネーションセンター
SecurityWeek
Press · 22 Jul 2026, 07:00 · Fourth SharePoint Vulnerability Exploited in Past Month’s Wave of Attacks - SecurityWeek
Help Net Security
Press · 22 Jul 2026, 07:00 · Another SharePoint RCE exploited: Patch, then rotate your machine keys (CVE-2026-50522) - Help Net Security
See all 28 source documents
CERT-FR
Technical advisory · 22 Jul 2026, 00:00 · Multiples vulnérabilités dans Microsoft Sharepoint (22 juillet 2026)
CERT-FR
Press · 22 Jul 2026, 00:00 · Multiples vulnérabilités dans Microsoft Sharepoint (22 juillet 2026)
Arctic Wolf
Press · 21 Jul 2026, 07:00 · UPDATE: Microsoft SharePoint Server Vulnerabilities – Immediate Patching Required - Arctic Wolf
The Hacker News
Press · 21 Jul 2026, 07:00 · Critical SharePoint RCE CVE-2026-50522 Under Active Exploitation After Public PoC - The Hacker News
CyberSecurityNews
Press · 21 Jul 2026, 07:00 · Critical SharePoint Remote Code Execution Vulnerability Actively Exploited in the Wild - CyberSecurityNews
Security Affairs
Press · 21 Jul 2026, 07:00 · Public PoC triggers active exploitation of critical SharePoint RCE vulnerability CVE-2026-50522 - Security Affairs
Cyber Press
Press · 20 Jul 2026, 07:00 · Actively Exploited SharePoint Flaws Let Hackers Deploy Web Shells and Steal IIS Machine Keys - Cyber Press
CyberSecurityNews
Press · 19 Jul 2026, 07:00 · Weekly Cyber Security Newsletter Bulletin – EY Breach, Wpzshell Exploit, Notepad++ Flaws +20 Stories - CyberSecurityNews
Resecurity
Press · 18 Jul 2026, 07:00 · From Web Request to Domain Compromise: Understanding the July 2026 SharePoint Attacks - Resecurity
Rapid7
Press · 17 Jul 2026, 07:00 · Rapid7 - Rapid7
The Hacker News
Press · 17 Jul 2026, 07:00 · CISA Adds Exploited SharePoint RCE Zero-Day CVE-2026-58644 to KEV - The Hacker News
SecurityWeek
Press · 17 Jul 2026, 07:00 · Fresh SharePoint Vulnerability Exploited Soon After Disclosure - SecurityWeek
LinkedIn
Press · 16 Jul 2026, 07:00 · WARNING: Threat Actors Exploit Multiple Microsoft SharePoint Flaws - LinkedIn
Cyber Press
Press · 15 Jul 2026, 07:00 · Microsoft July Patch Tuesday Fixes Record 570 Vulnerabilities and Three Exploited Zero-Days - Cyber Press
Field Effect
Press · 15 Jul 2026, 07:00 · Microsoft July 2026 Patch Tuesday Addresses Exploited SharePoint Vulnerabilities - Field Effect
Kaspersky
Press · 15 Jul 2026, 07:00 · A tsunami of vulnerabilities: July’s Microsoft Patch Tuesday - Kaspersky
Help Net Security
Press · 15 Jul 2026, 07:00 · AI-driven bug hunting fuels record Microsoft Patch Tuesday - Help Net Security
BleepingComputer
Press · 15 Jul 2026, 07:00 · CISA warns admins to patch actively exploited SharePoint flaws - BleepingComputer
The Register
Press · 15 Jul 2026, 07:00 · CISA sounds alarm over trio of exploited SharePoint flaws - The Register
Zero Day Initiative - Blog
Press · 14 Jul 2026, 17:56 · The July 2026 Security Update Review
Cisco Talos Blog
Press · 14 Jul 2026, 07:00 · Microsoft Patch Tuesday for July 2026 — Snort rules and prominent vulnerabilities - Cisco Talos Blog
CyberSecurityNews
Press · 14 Jul 2026, 07:00 · Massive Microsoft Patch Tuesday Update: 570 Vulnerabilities Fixed, Including 3 Zero-Days - CyberSecurityNews
Security Affairs
Press · 14 Jul 2026, 07:00 · Patch Tuesday security updates for July 2026, the largest update ever. 621 CVEs in one month - Security Affairs

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 15:14). The curve appears once the score changes.

Public exploit evidence

1

Public exploit entries / repo candidates

See 1 repos with metrics
RepositoryStarsForksLanguageUpdated
WismanSec/sharepoint-2026-poc20HTML06 Aug 2026, 18:45
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 9.8; EPSS 15.9%
Attention, last 30 days
0 distinct story titles; 0 press documents; 0 publisher domains.
Technical potential
network access, no prior privileges, 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 14:00:17.665024+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline
First press mention
14 Jul 2026, 07:00
Published
14 Jul 2026, 17:05
Added to the CISA KEV catalog
16 Jul 2026, 00:00
Latest press mention
20 Sep 2026, 07:00
Score calculated
05 Nov 2026, 14:00
PoCs on GitHub
1 repositories