CVE•Published 2026-07-14•Modified 2026-08-19•8 articles on news•5 live references•NVD data

CVE-2026-55040Microsoft · Sharepoint_server

Vulnerability data via NVD (ingested)

CVSS v3.1

9.1

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS percentile

Exploit Prediction Scoring System · top 10% of all CVEs

Weaknesses (CWE)

CWE-1390Weak Authentication

Description

Weak authentication in Microsoft Office SharePoint allows an unauthorized attacker to bypass a security feature over a network.

Timeline

Published 2026-07-14

Modified 2026-08-19

External references

NVD MITRE Exploit-DB trickest/cve VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag15,290 hosts

vuln:CVE-2026-55040

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Microsoft Sharepoint Server"

All exposed Microsoft Sharepoint Server instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Sharepoint Server"

HTTP body or banner mentions "Sharepoint Server" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-55040

Country / ASN / product breakdown for the vuln query.

Censys

vulnerabilities.cve_id: CVE-2026-55040

Censys host search filtered to this CVE id.

grep.app

CVE-2026-55040

Public source-code mentions — fast PoC discovery.

GitHub code

CVE-2026-55040

GitHub code search for direct mentions.

Google dork

"CVE-2026-55040" exploit -site:nvd.nist.gov

Write-ups and news, NVD excluded.

Known PoCs on GitHub (7)

CVE-2026-550407 repos

0xMarcio/pocindexPython

Search 82,000+ public CVE proof-of-concept exploits from GitHub, Nuclei, ExploitDB, Metasploit and Vulhub.

★ 1,394·updated 2d ago

killvxk/gitweeklyPython

收集各种有趣的github项目

★ 118·updated 2d ago

webpro255/awesome-ai-agent-attacksunknown

A curated timeline of real AI agent security incidents, breaches, and vulnerabilities (2024-2026). Every entry sourced and dated.

★ 70·updated 5d ago

sfewer-r7/CVE-2026-55040Python

Microsoft SharePoint JWT Authentication Bypass (CVE-2026-55040)

★ 58·updated 1mo ago

l0ggg/CVE-2026-55040Python

Exploit code for CVE-2026-55040, it can create auth header for any validate account.

★ 3·updated 1mo ago

barmi/cve-patch-auditorGo

Audit CVE impact, patch status, remediation progress, and verification results across systems.

★ 3·updated 2d ago

hypnguyen1209/CVE-2026-63520Python

POC pre-auth RCE on Sharepoint chain

★ 1·updated 2w ago