Page generated: 10 Nov 2026, 15:56 UTC
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CVE-2026-50522

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: 3.04%: +0.02

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

Sources: 29 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

The Hacker News
Press · 13 Aug 2026, 07:00 · Attackers Exploit SharePoint Authentication Bypass After Public PoC Release - The Hacker News
Rescana
Press · 12 Aug 2026, 07:00 · Active Exploitation Alert: Critical Microsoft SharePoint CVE-2026-50522 Vulnerability Targeted in Global Attacks - Rescana
Notebookcheck
Press · 31 Jul 2026, 07:00 · SharePoint zero-day grants Farm Admin rights, CISA warns - Notebookcheck
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
Check Point Research
Press · 27 Jul 2026, 07:00 · 27th July – Threat Intelligence Report - Check Point Research
See all 29 source documents
thestack.technology
Press · 23 Jul 2026, 07:00 · You had six days to patch the latest SharePoint flaw before attackers moved in - thestack.technology
HotHardware
Press · 23 Jul 2026, 07:00 · Microsoft Warns Critical SharePoint Flaw Is Under Active Attack - HotHardware
Cyber Daily
Press · 22 Jul 2026, 07:00 · Patch now! Hackers actively targeting critical SharePoint RCE, researchers warn - Cyber Daily
SecurityWeek
Press · 22 Jul 2026, 07:00 · Fourth SharePoint Vulnerability Exploited in Past Month’s Wave of Attacks - SecurityWeek
SOCRadar
Press · 22 Jul 2026, 07:00 · CVE-2026-50522 PoC Fuels SharePoint Attacks - SOCRadar
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
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)
The Hacker News
Press · 21 Jul 2026, 07:00 · Critical SharePoint RCE CVE-2026-50522 Under Active Exploitation After Public PoC - The Hacker News
Security Affairs
Press · 21 Jul 2026, 07:00 · Public PoC triggers active exploitation of critical SharePoint RCE vulnerability CVE-2026-50522 - Security Affairs
CyberSecurityNews
Press · 21 Jul 2026, 07:00 · Critical SharePoint Remote Code Execution Vulnerability Actively Exploited in the Wild - CyberSecurityNews
Cybersecurity Dive
Press · 21 Jul 2026, 07:00 · Microsoft SharePoint under attack via new exploit - Cybersecurity Dive
BleepingComputer
Press · 21 Jul 2026, 07:00 · Critical SharePoint RCE flaw exploited to steal machine keys - BleepingComputer
Arctic Wolf
Press · 21 Jul 2026, 07:00 · UPDATE: Microsoft SharePoint Server Vulnerabilities – Immediate Patching Required - Arctic Wolf
Cyber Press
Press · 20 Jul 2026, 07:00 · Actively Exploited SharePoint Flaws Let Hackers Deploy Web Shells and Steal IIS Machine Keys - Cyber Press
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
PCWorld
Press · 15 Jul 2026, 07:00 · Microsoft’s July patches fix over 600 flaws, shattering last month’s record - PCWorld
Help Net Security
Press · 15 Jul 2026, 07:00 · AI-driven bug hunting fuels record Microsoft Patch Tuesday - Help Net Security
Zero Day Initiative - Blog
Press · 14 Jul 2026, 17:56 · The July 2026 Security Update Review
The Hacker News
Press · 14 Jul 2026, 07:00 · Microsoft Patches Record 622 Flaws, Including Two Zero-Days Under Active Attack - The Hacker News
thezdi.com
Press · 14 Jul 2026, 07:00 · The July 2026 Security Update Review - thezdi.com
Cisco Talos Blog
Press · 14 Jul 2026, 07:00 · Microsoft Patch Tuesday for July 2026 — Snort rules and prominent vulnerabilities - Cisco Talos Blog
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

2

Public exploit entries / repo candidates

See 2 repos with metrics
RepositoryStarsForksLanguageUpdated
4minx/CVE-2026-505224417C#15 Aug 2026, 10:03
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 3.0%
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 14:00:14.443524+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
22 Jul 2026, 00:00
Latest press mention
13 Aug 2026, 07:00
Score calculated
05 Nov 2026, 14:00
PoCs on GitHub
2 repositories