CVE-2026-55126Patch(microsoft / sharepoint_server)

LOWCVSS 5.4 · MEDIUM

Signal is active with 1 mentions in latest observed window

Immediate actions

Patch microsoft sharepoint_server systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.

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0.5/ 10 priority

Sources & remediation

Patch / fix

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55126

Weakness type (CWE)

CWE-79

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

sharepoint_server

Threat summary

Patch or workaround signal is available
1 mentions across 1 observed day

What's happening

Patch or workaround mentioned in 1 signal
Technical details provided in 1 signal
1 total mentions across 1 day

Affected systems

Vendors

microsoft

Products

sharepoint_server

2 versions affected across 1 product

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

Patch

1100.0%

Referenced assets1 URL

By indicator

https://windowsforum.com/threads/cve-2026-55126-patch-sharepoint-xss-with-july-kb5002891-updates.438734/?utm_source=x&utm_medium=social&utm_campaign=news_node84

Full discourse1 post

Windows Forum@windowsforum97d
Patch
🪟 SharePoint’s “authenticated users only” XSS still means one compromised account can turn trust into a phishing playground. Patch KB5002891—because internal access isn’t a security boundary. https://windowsforum.com/threads/cve-2026-55126-patch-sharepoint-xss-with-july-kb5002891-updates.438734/?utm_source=x&utm_medium=social&utm_campaign=news_node84 #SharepointSecurity #MicrosoftPatches #CrossSiteScripting https://t.co/wpg0Y8fX5O
Post summary
Microsoft released Patch KB5002891 to remediate CVE‑2026‑55126, a SharePoint authenticated‑user XSS flaw that could enable an attacker to create a phishing playground. The post focuses on the availability of the fix rather than exploitation details.
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1.2K followersView on X

CPE platform detail3 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

3 of 3 entries

Part	Vendor	Product	Version	Target SW	Target HW
App	microsoft	sharepoint_server	-	-	-
App	microsoft	sharepoint_server	2016	-	-
App	microsoft	sharepoint_server	2019	-	-

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