Security readout for executives and security teams
Plain-English summary
CVE-2026-45489 is a Microsoft Edge Chromium-based spoofing vulnerability. A successful attack could trick a user into trusting misleading browser-presented information, with high potential confidentiality impact. Exploitation requires user interaction. Microsoft has published vendor guidance and a patch reference.
Executive priority
Treat as a routine but timely browser security update. The issue is medium severity and requires user interaction, but browser spoofing can support credential theft or sensitive-data exposure. Prioritize normal enterprise browser patch cycles and confirm completion.
Technical view
The record identifies CWE-290 spoofing in Microsoft Edge (Chromium-based), CVSS 3.1 score 6.5: AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N. The CVSS vector indicates remote attackability, no privileges required, required user interaction, and confidentiality impact only. Public details are limited in the provided sources.
Likely exposure
Organizations using Microsoft Edge (Chromium-based) should assume potential exposure until they verify their deployed versions against Microsoft’s advisory. The source bundle lists Microsoft Edge (Chromium-based) version 1.0.0.0, but does not provide a broader affected-version range.
Exploitation context
The CVE is not listed as KEV in the provided data, and the CVSS exploit maturity is unproven. No cited source states active exploitation. User interaction is required, so realistic risk depends on users visiting or interacting with attacker-controlled content.
Researcher notes
Public technical detail is sparse. The strongest grounded indicators are the CVSS vector, CWE-290 classification, Microsoft advisory reference, and patch availability marker. Avoid assuming exploit mechanics, affected version breadth, or active exploitation without additional vendor or threat-intelligence evidence.
Mitigation direction
- Review Microsoft’s CVE-2026-45489 advisory for affected versions and update instructions.
- Apply the Microsoft Edge security update where applicable.
- Ensure managed endpoints receive Edge updates through existing patch management channels.
- If patch timing is delayed, monitor Microsoft guidance for any interim mitigations.
Validation and detection
- Inventory Microsoft Edge versions across workstations and servers.
- Compare deployed versions with Microsoft’s advisory for CVE-2026-45489.
- Confirm Edge update deployment succeeded on representative managed endpoints.
- Monitor vulnerability scanners or endpoint tools for remaining CVE-2026-45489 detections.
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-290: 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-2026-45489 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
- 6.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/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:H/I:N/A:N/E:U/RL:O/RC:C2.83.6microsoftVulnerability scoring details
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/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.
Authentication Bypass by Spoofing
Authentication Bypass by Spoofing represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.