Microsoft SharePoint Server Remote Code Execution Vulnerability
Deserialization of untrusted data in on-premises Microsoft SharePoint Server allows an unauthorized attacker to execute code over a network. Microsoft is aware that an exploit for CVE-2025-53770 exists in the wild. Microsoft is preparing and fully testing a comprehensive update to address this vulnerability. In the meantime, please make sure that the mitigation provided in this CVE documentation is in place so that you are protected from exploitation.
- Published
- Jul 19, 2025
- Updated
- Aug 4, 2026
- EPSS
- 100.0% · 100th percentile
- CWE
- CWE-502
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Report tools
Action score
99
Now
Patch today or shut off access.
- CVSS
- 39 / 40 · 9.8 / 10
- CISA KEV
- 30 / 30 · Listed
- EPSS
- 30 / 30 · 100.0%
CISA SSVC decision
- Exploitation
- active
- Automatable
- yes
- Technical impact
- total
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · microsoft
- 9.8
- NVD has not scored this yet; the score shown is the CNA’s.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:W/RC:C
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Actively exploited in the wild
CISA added this to its Known Exploited Vulnerabilities catalog on Jul 20, 2025. That signals real attacks, not theory.
Remediation deadline for government agencies: Jul 21, 2025.
Known to be used in ransomware campaigns.
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| microsoft | sharepoint server | cpe:2.3:a:microsoft:sharepoint_server |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- microsoft sharepoint serverbefore 16.0.18526.20508
- microsoft sharepoint server2016
- microsoft sharepoint server2019
Versions reported by the vendor
Affected version ranges reported by the assigning authority (microsoft). Independent of NVD's CPE analysis and usually ahead of it.
Microsoft Microsoft SharePoint Enterprise Server 2016
- 16.0.0 and later · before 16.0.5513.1001affected
Microsoft Microsoft SharePoint Server 2019
- 16.0.0 and later · before 16.0.10417.20037affected
Microsoft Microsoft SharePoint Server Subscription Edition
- 16.0.0 and later · before 16.0.18526.20508affected
Same product
microsoft: all recordsOther highest-scoring records for the same primary product.
- CVE-2023-29357Microsoft SharePoint Server Elevation of Privilege VulnerabilityKEV99Now
- CVE-2025-49704Microsoft SharePoint Remote Code Execution VulnerabilityKEV95Now
- CVE-2026-20963Microsoft SharePoint Remote Code Execution VulnerabilityKEV78This week
- CVE-2026-58644Microsoft SharePoint Remote Code Execution VulnerabilityKEV74This week
- CVE-2024-38094Microsoft SharePoint Remote Code Execution VulnerabilityKEV73This week
- CVE-2026-55040Microsoft SharePoint Server Security Feature Bypass VulnerabilityKEV71This week
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Microsoft SharePoint Enterprise Server 2016 | 16.0.5513.1001 · KB5002760 | Microsoft (MSRC) |
| Microsoft SharePoint Server 2019 | 16.0.10417.20037 · KB5002754 | Microsoft (MSRC) |
| Microsoft SharePoint Server Subscription Edition | 16.0.18526.20508 · KB5002768 | Microsoft (MSRC) |
Exploit status
Weaponized
A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.
Evidence
- Metasploit module ×1
- Exploit-DB entry ×1
- Nuclei detection template ×3
- Proof-of-concept repository on GitHub ×44
Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.
| Source | Kind | Date |
|---|---|---|
| Exploit-DB entry | remote | 2025-08-11 |
| Metasploit module | exploit/windows/http/sharepoint_toolpane_rceMicrosoft SharePoint Server ToolPane Unauthenticated Remote Code Execution (aka ToolShell)exploit | 2025-07-08 |
| Nuclei detection template | Nuclei template CVE-2025-53770 | — |
| Nuclei detection template | Nuclei template CVE-2025-53771 | — |
| Nuclei detection template | Nuclei template sharepoint-toolshell-backdoor | — |
| Proof-of-concept repository on GitHub | stars:0 | 2025-07-21 |
| Proof-of-concept repository on GitHub | stars:3 | 2025-07-21 |
| Proof-of-concept repository on GitHub | stars:43 | 2025-07-21 |
| Proof-of-concept repository on GitHub | stars:0 | 2025-07-21 |
| Proof-of-concept repository on GitHub | stars:1 | 2025-07-21 |
| Proof-of-concept repository on GitHub | stars:0 | 2025-07-21 |
| Proof-of-concept repository on GitHub | stars:314 | 2025-07-21 |
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
- Metasploit-12 d
- Published
- CISA KEVsame day
- First PoC+1 d
- TodaySep 29, 2026+437 d
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
- CVE-2026-20963178 days apartMicrosoft SharePoint Remote Code Execution VulnerabilityKEV78This week
- CVE-2026-58644360 days apartMicrosoft SharePoint Remote Code Execution VulnerabilityKEV74This week
- CVE-2024-38094375 days apartMicrosoft SharePoint Remote Code Execution VulnerabilityKEV73This week
- CVE-2026-50522360 days apartMicrosoft SharePoint Remote Code Execution VulnerabilityKEV70This week
- CVE-2026-45659307 days apartMicrosoft SharePoint Remote Code Execution VulnerabilityKEV66This week
- CVE-2024-30044431 days apartMicrosoft SharePoint Server Remote Code Execution Vulnerability53Plan
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-502 · Deserialization of Untrusted DataCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
nvd-secondary
Root cause
Data received over the network is deserialized into the language’s native object format without verifying its source. Code paths inside the object can be triggered during deserialization.
The bug in code
The whole CWE-502 classA representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.
Vulnerable
payload = sock.recv(65536)job = pickle.loads(payload)Fixed
payload = sock.recv(65536)if not hmac.compare_digest(sign(payload), header_sig): raise PermissionError("invalid signature")job = JobSchema.validate(json.loads(payload))Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
ATT&CK techniques
—
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53770
- msrc.microsoft.com/blog/2025/07/customer-guidance-for-sharepoint-vulnerability-cve-2025-53770/
- news.ycombinator.com/item?id=44629710
- therecord.media/microsoft-sharepoint-zero-day-vulnerability-exploited-globally
- www.bleepingcomputer.com/news/microsoft/microsoft-sharepoint-zero-day-exploited-in-rce-attacks-no-patch-available/
- www.cisa.gov/news-events/alerts/2025/07/20/microsoft-releases-guidance-exploitation-sharepoint-vulnerability-cve-2025-53770
- www.darkreading.com/remote-workforce/microsoft-rushes-emergency-fix-exploited-sharepoint-toolshell-flaw
- www.forbes.com/sites/daveywinder/2025/07/20/microsoft-confirms-ongoing-mass-sharepoint-attack---no-patch-available/
- x.com/Shadowserver/status/1946900837306868163
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-53770
Vendor advisories and official records. Exploit/PoC links are deliberately left out.