SharePoint July 2026 deserialization RCE: lab PoC and captured artifacts for detection
SharePoint July 2026 deserialization RCE: lab PoC and captured artifacts for detection Source: https://sp-poc.wismansec.com/
SharePoint July 2026 deserialization RCE: lab PoC and captured artifacts for detection
Description
SharePoint July 2026 deserialization RCE: lab PoC and captured artifacts for detection Source: https://sp-poc.wismansec.com/
Reddit Discussion
I recently ran into a SharePoint intrusion that seemed to fit with the CVEs recently added to CISA's KEV for SharePoint a couple of weeks ago. The available IOCs were basically nonexistent. So I reproduced the /_trust deserialization chain in my own lab (SharePoint SE on the June 2026 patch level, build 16.0.19725.20384 / KB5002873) and captured the artifacts: process trees, the machine-key theft, and hunt queries, to save the next person the same scramble.
Writeup and sanitized scripts: https://sp-poc.wismansec.com/
Feedback, questions, and better detections welcome.
Links cited in this discussion
Technical Details
- Source Type
- Subreddit
- blueteamsec+AskNetsec+Information_Security
- Reddit Score
- 0
- Discussion Level
- minimal
- Content Source
- reddit_link_post
- Post Type
- link
- Domain
- null
- Newsworthiness Assessment
- {"score":33,"reasons":["external_link","newsworthy_keywords:rce,apt","established_author","very_recent"],"isNewsworthy":true,"foundNewsworthy":["rce","apt"],"foundNonNewsworthy":[]}
- Has External Source
- true
- Trusted Domain
- false
Threat ID: 6a666fef9c2644c7f861bee4
Added to database: 07/26/2026, 20:37:03 UTC
Last updated: 07/26/2026, 20:37:05 UTC
Views: 1
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