CVE-2026-55034

Microsoft SharePoint Server Spoofing Vulnerability

En bref

Sévérité: HIGH 7.3
EPSS: EPSS 0.95 % · centile 61 (2026-10-27)
État: PUBLISHED
Publiée: 2026-07-14
Mise à jour: 2026-10-08
Attribuée par: microsoft
Statut NVD: Analyzed

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.

Scores

Version	Score	Vecteur	Évalué par
CVSS 3.1	HIGH 7.3	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C	microsoft
CVSS 3.1	HIGH 7.3	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N	NVD · secure@microsoft.com (Secondary)
CVSS 3.1	HIGH 8.7	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N	NVD · nvd@nist.gov (Primary)

Faiblesses (CWE)

CWE-79

Références européennes

ENISA EUVD · EUVD-2026-44175
GCVE · GCVE-0-2026-55034

Avis du CERT-FR

CERTFR-2026-AVI-0872 — Multiples vulnérabilités dans les produits Microsoft · cert.ssi.gouv.fr

Configurations affectées (CPE NVD)

cpe:2.3:a:microsoft:sharepoint_server:*:*:*:*:subscription:*:*:* < 16.0.19725.20434
cpe:2.3:a:microsoft:sharepoint_server:2016:*:*:*:enterprise:*:*:*
cpe:2.3:a:microsoft:sharepoint_server:2019:*:*:*:*:*:*:*

Produits affectés

Produit	Versions
Microsoft · Microsoft SharePoint Enterprise Server 2016	affected 16.0.0 < 16.0.5561.1001
Microsoft · Microsoft SharePoint Server 2019	affected 16.0.0 < 16.0.10417.20175
Microsoft · Microsoft SharePoint Server Subscription Edition	affected 16.0.0 < 16.0.19725.20434

Références

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55034

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)	Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD