Security readout for executives and security teams
Plain-English summary
This is a Microsoft Edge spoofing flaw where the browser can misrepresent important interface information. A successful attack could trick a user into trusting misleading browser UI, with limited confidentiality and integrity impact. It requires user interaction and is rated medium severity.
Executive priority
Treat this as a routine browser security update with moderate urgency. It is not supported as actively exploited in the provided evidence, but browsers are high-exposure user-facing software and should stay current.
Technical view
CVE-2026-45488 is a CWE-451 UI misrepresentation issue in Microsoft Edge (Chromium-based). The CVSS 3.1 score is 5.4: network reachable, low complexity, no privileges required, user interaction required, with low confidentiality and integrity impact and no availability impact.
Likely exposure
Organizations with Microsoft Edge (Chromium-based) deployed before the relevant MSRC update may be exposed. The bundle only lists version 1.0.0.0, so validate affected and fixed builds against Microsoft’s advisory rather than assuming broader version ranges.
Exploitation context
The provided sources do not show active exploitation, and the CVE is not listed as KEV. CVSS marks exploit maturity as unproven. Exploitation would require persuading a user to interact with attacker-controlled network content.
Researcher notes
Evidence is sparse beyond the CVE metadata and MSRC advisory. The key operational points are CWE-451, user interaction requirement, low C/I impact, no availability impact, and no KEV signal. Do not infer exploitability beyond the supplied sources.
Mitigation direction
- Apply the Microsoft Edge update referenced by MSRC.
- Confirm browser auto-update is enabled and completing successfully.
- Check Microsoft guidance for exact fixed builds and deployment notes.
- Prioritize managed endpoints where Edge is the default browser.
Validation and detection
- Inventory Microsoft Edge (Chromium-based) versions across endpoints.
- Compare installed builds with the MSRC advisory’s fixed guidance.
- Confirm update deployment through endpoint management reporting.
- Review security reports for suspicious browser UI spoofing complaints.
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-451: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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-2026-45488 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
- 5.4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/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:N/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C2.82.5microsoftVulnerability scoring details
Base CVSS 3.1 score
5.4MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/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 Edge (Chromium-based) 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.
User Interface (UI) Misrepresentation of Critical Information
User Interface (UI) Misrepresentation of Critical Information represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.