Security readout for executives and security teams
Plain-English summary
CVE-2026-58525 is a high-severity Microsoft Edge security feature bypass. An attacker on the network could bypass a browser security control if the user interacts with malicious content. Microsoft has published advisory and patch information. No source provided indicates active exploitation.
Executive priority
Treat this as a near-term browser patching priority. The issue has high potential confidentiality impact, but requires user interaction and has no confirmed active exploitation in the provided sources.
Technical view
The issue is improper access control in Microsoft Edge (Chromium-based), mapped to CWE-284. CVSS 3.1 is 8.2 with network attack vector, low complexity, no privileges required, user interaction required, changed scope, high confidentiality impact, low integrity impact, and no availability impact.
Likely exposure
Organizations using Microsoft Edge (Chromium-based) may be exposed if browsers are not updated according to Microsoft’s advisory. The provided affected-version data is limited, so vulnerability managers should verify applicability directly in MSRC and endpoint inventory.
Exploitation context
The CVSS vector indicates remote network exploitation with user interaction. The source bundle marks KEV as false and exploit maturity as unproven, so active exploitation should not be assumed from the provided evidence.
Researcher notes
Details are sparse beyond Microsoft’s classification and CVSS. The key constraints are UI-required, no privileges required, network vector, and security feature bypass. Do not infer exploitability or affected build ranges beyond Microsoft’s advisory.
Mitigation direction
- Apply the Microsoft Edge update referenced in the MSRC advisory.
- Ensure Edge auto-update is enabled and not blocked by policy.
- Review Microsoft guidance for any additional mitigation or version details.
- Prioritize managed endpoints where browsers lag behind update baselines.
Validation and detection
- Inventory Microsoft Edge Chromium-based installations across endpoints.
- Compare installed versions against the MSRC advisory’s fixed version guidance.
- Confirm update deployment through endpoint management or vulnerability scanning.
- Check for policies preventing Edge updates or browser restarts.
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-284: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. 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-2026-58525 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
- High
- CVSS
- 8.2 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/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:C/C:H/I:L/A:N/E:U/RL:O/RC:C2.84.7microsoftVulnerability scoring details
Base CVSS 3.1 score
8.2HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/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) Security Feature Bypass 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 Access Control
Improper Access Control represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.