Page generated: 11 Nov 2026, 14:06 UTC
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CVE-2026-56164

Missing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.

CVSS 5.3 (MEDIUM) KEV: KNOWN CATALOG

Attention and evidence

HYPE SCORE
0.0/10
REALITY · THREAT PRIORITY
7.8/10
General review priority; not probability

Evidence confidence: Exploitation recorded

Why this priority?
  • Recorded exploitation baseline: +7.00
  • Technical severity: CVSS 5.3: +0.79
  • Fresh EPSS: 1.01%: +0.01

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

Sources: 26 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 · 26 Aug 2026, 07:00 · Hackers target Microsoft SharePoint RCE chain with PoC exploit - BleepingComputer
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
https://tech-insider.org/
Press · 23 Jul 2026, 07:00 · Microsoft Patches Record 570 CVEs, 2 Zero-Days [2026] - https://tech-insider.org/
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 26 source documents
SecurityWeek
Press · 22 Jul 2026, 07:00 · Fourth SharePoint Vulnerability Exploited in Past Month’s Wave of Attacks - SecurityWeek
The Hacker News
Press · 21 Jul 2026, 07:00 · Critical SharePoint RCE CVE-2026-50522 Under Active Exploitation After Public PoC - The Hacker News
Resecurity
Press · 18 Jul 2026, 07:00 · From Web Request to Domain Compromise: Understanding the July 2026 SharePoint Attacks - Resecurity
SecurityWeek
Press · 17 Jul 2026, 07:00 · Fresh SharePoint Vulnerability Exploited Soon After Disclosure - SecurityWeek
The Hacker News
Press · 17 Jul 2026, 07:00 · CISA Adds Exploited SharePoint RCE Zero-Day CVE-2026-58644 to KEV - The Hacker News
LinkedIn
Press · 16 Jul 2026, 07:00 · WARNING: Threat Actors Exploit Multiple Microsoft SharePoint Flaws - LinkedIn
SOC Prime
Press · 16 Jul 2026, 07:00 · CVE-2026-56164 & CVE-2026-56155 Zero-Days - SOC Prime
Infosecurity Magazine
Press · 15 Jul 2026, 07:00 · Microsoft Patches 570 CVEs in Record Patch Tuesday - Infosecurity Magazine
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
Cybersecurity Dive
Press · 15 Jul 2026, 07:00 · CISA warns that multiple vulnerabilities in SharePoint are under exploitation - Cybersecurity Dive
The Record from Recorded Future News
Press · 15 Jul 2026, 07:00 · Microsoft smashes Patch Tuesday record for second successive month - The Record from Recorded Future News
Forbes
Press · 15 Jul 2026, 07:00 · Microsoft Warns 2 Zero-Days Already Exploited In Attacks: Update Now - Forbes
SecurityWeek
Press · 15 Jul 2026, 07:00 · CISA Urges Immediate Patching of Exploited SharePoint Vulnerabilities - SecurityWeek
Field Effect
Press · 15 Jul 2026, 07:00 · Microsoft July 2026 Patch Tuesday Addresses Exploited SharePoint Vulnerabilities - Field Effect
Zero Day Initiative - Blog
Press · 14 Jul 2026, 17:56 · The July 2026 Security Update Review
SecurityWeek
Press · 14 Jul 2026, 07:00 · Microsoft Patches Record 622 Vulnerabilities, Including Two Exploited Zero-Days - SecurityWeek
Security Boulevard
Press · 14 Jul 2026, 07:00 · Microsoft’s July 2026 Patch Tuesday Addresses 569 CVEs (CVE-2026-56155, CVE-2026-56164) - Security Boulevard
The Hacker News
Press · 14 Jul 2026, 07:00 · Microsoft Patches Record 622 Flaws, Including Two Zero-Days Under Active Attack - The Hacker News
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 7.8 (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
sam00/POC-CVE-2026-56164-exploit20Python06 Aug 2026, 13:59
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 5.3; EPSS 1.0%
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 14:00:16.575960+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

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