CVE-2026-45453Patch(microsoft / sharepoint_server)

LOWCVSS 5.4 · MEDIUM

Exploit discussion active in current signal (1 latest mentions)

Immediate actions

Patch microsoft sharepoint_server systems immediately
Hunt for exploitation attempts and persistence artifacts
Increase monitoring for publicly documented tradecraft

Recommended action window: High priority (within 72h)

NVD description

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

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2.0/ 10 priority

Sources & remediation

Vendor / third-party advisories

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45453

Weakness type (CWE)

CWE-79

Priority

LOW

Exploitation

NONE

PoC

YES

Patch

AVAILABLE

Momentum

STABLE

Are you affected?

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

sharepoint_server

Threat summary

Public PoC is present in monitored signal
Patch or workaround signal is available
3 mentions across 3 observed days
Momentum state: stable

What's happening

PoC mentioned or linked in 1 signal
Patch or workaround mentioned in 2 signals
Technical details provided in 2 signals
Disclosure: 1 classified signal
Peaked 2d ago at 1 mentions (2026-06-09); latest day: 1
3 total mentions across 3 days

Affected systems

Vendors

microsoft

Products

sharepoint_server

2 versions affected across 1 product

Deep dive

Activity timeline3 mentions / 3d

Signal classification2 categories

Patch

266.7%

Disclosure

133.3%

Referenced assets3 URLs

By indicator

Classification over time

Date	Total	Labels

2026-06-09	1	Patch1
2026-06-16	1	Patch1
2026-06-17	1	Disclosure1

Full discourse3 posts

Aretiq.AI@AretiqAI130d
Patch
SharePoint Server reflected XSS — CVE-2026-45453. Three workflow pages render DocURL into <a href> via NoEncode() — 9 injection points, no auth needed to craft the link. Hover to fire. Patch: KB5002874 / KB5002880 / KB5002873 https://aretiq.ai/research/13/
Post summary
The post reports a discovered reflected XSS issue in SharePoint Server (CVE-2026-45453), lists specific Microsoft patches, and provides technical details but no PoC, exploit code, or evidence of active exploitation.
0801891.1K
226 followersView on X
Autumn Good@autumn_good_35129d
Disclosure
⚠️⚠️⚠️ 『The attack requires no special server configuration — the Shared Documents library exists by default in every SharePoint team site.』 CVE-2026-45453 — Microsoft SharePoint Server Workflow Pages DocURL Parameter Reflected Cross-Site Scripting https://aretiq.ai/research/vul260604-cve-2026-45453-microsoft-sharepoint-server-workflow-pages-docurl-parameter-reflected-cross-site-scripting/
Post summary
A new reflected XSS vulnerability, CVE-2026-45453, affects SharePoint’s Workflow Pages via the DocURL parameter; the attack works on default settings and is linked to a research page for details.
00011309
6.9K followersView on X
WindowsForum@windowsforum137d
Patch
🪟 SharePoint “spoofing” isn’t spooky marketing—it's the quiet reminder that on-prem still matters. Patch June means fewer fake links/docs landing in real workflows. Pay attention. #Windows #Microsoft #SharePoint #CVE https://windowsforum.com/threads/cve-2026-45453-sharepoint-spoofing-why-admins-should-patch-this-june.424267/?utm_source=x&utm_medium=social&utm_campaign=news_node84 #SharepointServer https://t.co/bFJ0HRT7Lz
Post summary
The tweet emphasizes the importance of applying the upcoming June patch for CVE‑2026‑45453 to prevent SharePoint spoofing, without providing any PoC, exploit, or technical detail.
0000032
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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