Security readout for executives and security teams
Plain-English summary
An authorized user could inject content into a vulnerable Project Server web page and mislead another user who views it. Successful exploitation could expose or alter limited information, but is not expected to disrupt service. The supplied record rates the issue medium severity with a 4.6 CVSS score.
Executive priority
Schedule remediation through the normal security-update cycle, prioritizing internet-accessible or broadly accessible deployments. Escalate if sensitive Project Server data is exposed to many low-privileged users. The required authorization and user interaction reduce urgency compared with unauthenticated flaws, but spoofing and script execution can still support credential theft or deceptive workflows.
Technical view
CVE-2026-45483 is a CWE-79 cross-site scripting flaw caused by improper input neutralization during web page generation. Exploitation is network-accessible, low complexity, requires low privileges and user interaction, and may cause low confidentiality and integrity impact without availability impact or a scope change.
Likely exposure
Potential exposure exists where affected SharePoint Server deployments provide Project Server functionality to authorized, low-privileged users. The supplied affected list names SharePoint Enterprise Server 2016, SharePoint Server 2019, and SharePoint Server Subscription Edition, each recorded as version 16.0.0. More precise affected-build boundaries are not provided.
Exploitation context
The attacker must already be authorized and must induce another user to interact with affected content. The supplied CVSS vector marks exploit maturity as unproven, and the record is not listed as KEV. No supplied source supports active exploitation; absence from KEV does not prove exploitation has never occurred.
Researcher notes
The supplied data identifies CWE-79 and a spoofing impact, but does not describe the vulnerable parameter, page, execution context, affected build ranges, patch identifiers, or detection indicators. The title refers to Office Project Server while the affected products list SharePoint Server editions; validate actual applicability against Microsoft’s advisory before drawing product-level conclusions.
Mitigation direction
- Review Microsoft’s CVE advisory for the applicable security update and deployment requirements.
- Apply the applicable Microsoft update through the organization’s tested SharePoint patching process.
- Restrict unnecessary Project Server access and review low-privileged accounts pending remediation.
- Monitor Microsoft guidance for revised affected-build or mitigation information.
Validation and detection
- Inventory SharePoint 2016, 2019, and Subscription Edition deployments using Project Server functionality.
- Compare installed build and update levels with Microsoft’s CVE advisory.
- Confirm the applicable security update installed successfully on every affected server.
- Review authorized Project Server accounts and suspicious content activity around the affected application.
- Retest relevant pages safely after patching without using offensive payloads.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-45483 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 4.6 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C2.12.5microsoftVulnerability scoring details
Base CVSS 3.1 score
4.6MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- Microsoft Office Project Server Spoofing VulnerabilityCVE reference, microsoft · vendor-advisory, patch
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.