Page generated: 09 Nov 2026, 04:06 UTC
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CVE-2026-45659

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

CVSS 8.8 (HIGH) KEV: KNOWN CATALOG

Attention and evidence

HYPE SCORE
1.6/10
REALITY · THREAT PRIORITY
8.7/10
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: 80.24%: +0.40

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

Sources: 27 documents and public datasets.

Hype components

Headline sample (25%)
50/100
Press, 30 days (60%)
5/100
Grounded branding (15%)
0/100
HYPE TOTAL16/100

Sources and documents

DeXpose
Press · 23 Oct 2026, 11:56 · CVE 2026 | The Complete Guide to New, Critical & Actively Exploited Vulnerabilities (Updated Weekly) - DeXpose
SOC Prime
Press · 18 Sep 2026, 07:00 · CVE-2026-45659: SharePoint Deserialization Flaw Enables RCE - SOC Prime
BleepingComputer
Press · 26 Aug 2026, 07:00 · Hackers target Microsoft SharePoint RCE chain with PoC exploit - BleepingComputer
BleepingComputer
Press · 12 Aug 2026, 07:00 · Hackers leverage new Microsoft SharePoint exploit in attacks - BleepingComputer
BleepingComputer
Press · 11 Aug 2026, 07:00 · CISA: Microsoft SharePoint flaw now exploited in ransomware attacks - BleepingComputer
See all 27 source documents
SecurityWeek
Press · 22 Jul 2026, 07:00 · Fourth SharePoint Vulnerability Exploited in Past Month’s Wave of Attacks - SecurityWeek
Security Affairs
Press · 21 Jul 2026, 07:00 · Public PoC triggers active exploitation of critical SharePoint RCE vulnerability CVE-2026-50522 - Security Affairs
Cybersecurity Dive
Press · 21 Jul 2026, 07:00 · Microsoft SharePoint under attack via new exploit - Cybersecurity Dive
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
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
Cybersecurity Dive
Press · 15 Jul 2026, 07:00 · CISA warns that multiple vulnerabilities in SharePoint are under exploitation - Cybersecurity Dive
The Register
Press · 15 Jul 2026, 07:00 · CISA sounds alarm over trio of exploited SharePoint flaws - The Register
SecurityWeek
Press · 15 Jul 2026, 07:00 · CISA Urges Immediate Patching of Exploited SharePoint Vulnerabilities - SecurityWeek
https://tech-insider.org/
Press · 06 Jul 2026, 07:00 · SharePoint Vulnerability CVE-2026-45659 Exploited [2026] - https://tech-insider.org/
Rescana
Press · 05 Jul 2026, 07:00 · Active Exploitation Alert: Critical Microsoft SharePoint Server RCE Vulnerability CVE-2026-45659 Added to CISA KEV Catalog - Rescana
SecurityWeek
Press · 02 Jul 2026, 07:00 · CISA Warns of Actively Exploited Microsoft SharePoint Vulnerability - SecurityWeek
BleepingComputer
Press · 02 Jul 2026, 07:00 · CISA: Microsoft SharePoint RCE flaw now actively exploited - BleepingComputer
SC Media
Press · 02 Jul 2026, 07:00 · CISA adds SharePoint flaw to known exploited vulnerabilities list - SC Media
The Hacker News
Press · 02 Jul 2026, 07:00 · SharePoint RCE CVE-2026-45659 Added to CISA KEV After Active Exploitation - The Hacker News
The Register
Press · 02 Jul 2026, 07:00 · Microsoft said exploitation was 'less likely' ... but CISA just added SharePoint RCE to KEV list - The Register
SOCRadar
Press · 02 Jul 2026, 07:00 · CISA Flags SharePoint RCE (CVE-2026-45659) for Active Exploitation - SOCRadar
Computer Weekly
Press · 02 Jul 2026, 07:00 · US cyber agency warns over forgotten SharePoint flaw - Computer Weekly
Security Affairs
Press · 27 May 2026, 07:00 · Microsoft SharePoint Has a New RCE Flaw. If You Haven’t Patched Yet, Go Do That. - Security Affairs
Help Net Security
Press · 26 May 2026, 07:00 · High-severity SharePoint RCE bug patched by Microsoft (CVE-2026-45659) - Help Net Security
The Hacker News
Press · 26 May 2026, 07:00 · Microsoft Patches SharePoint RCE Flaw CVE-2026-45659 Across Server Versions - The Hacker News

Score evolution

● Hype   ● Reality

Earlier evidence-support scores are retained in history; this chart shows only the current priority definition.

First record: hype 1.6 · reality 8.7 (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 8.8; EPSS 80.2%
Attention, last 30 days
1 distinct story titles; 1 press documents; 1 publisher domains.
Technical potential
network access, low 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 14:00:11.172054+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline
Published
22 May 2026, 22:04
First press mention
26 May 2026, 07:00
Added to the CISA KEV catalog
01 Jul 2026, 00:00
Latest press mention
23 Oct 2026, 11:56
Score calculated
05 Nov 2026, 14:00
PoCs on GitHub
1 repositories