Evidence used
- No CISA KEV confirmation is currently recorded.
- EPSS is 0.26% for the current model date.
BlackTreeCVE IntelligenceFull vulnerability report · 2026
CVE-2026-88097High confidence
Microsoft Edge (Chromium-based) Elevation of Privilege Vulnerability
Microsoft · Microsoft Edge (Chromium-based)
8.1HighCVSS 3.1
Within 7 days
Patch availableHigh technical severity; prioritise exposed affected systems while verifying vendor guidance.
R
Open reassessment dashboard →Operational reassessment
Published severity in operational context
Published severityHigh→Operational priority:High, unchanged from published severity.unchanged
Compensating controls
- Validate the affected product branch and deploy the verified fixed release.
- Restrict local access and enforce least privilege on affected hosts.
- Monitor vendor guidance and exploitation sources for a material change.
Verification
- Confirm that the asset runs Microsoft Microsoft Edge (Chromium-based) and falls inside the recorded affected range.
- Verify the installed build against the product-specific fixed version after deployment.
- Validate exposure, authentication requirements and compensating controls in the actual environment.
- Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Direct vendor intelligence
1 currentAuthoritative vendor CSAF and VEX advisories
Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.
msrc_CVE-2026-88097 · CSAF 2.0 · revision 1 · finalMicrosoft Security Response CenterMicrosoft Edge (Chromium-based) Elevation of Privilege Vulnerability
The vendor explicitly identifies these products as affected by this CVE.
- Microsoft Edge (Chromium-based) <153.0.4234.46
- Summary
- Microsoft
- Remediation
- 153.0.4234.46:Security Update:https://docs.microsoft.com/en-us/DeployEdge/microsoft-edge-relnotes-security
High technical severity; prioritise exposed affected systems while verifying vendor guidance.
Patch available01
What, why and how
Use after free in Microsoft Edge (Chromium-based) allows an unauthorized attacker to elevate privileges locally.
What
Use after free in Microsoft Edge (Chromium-based) allows an unauthorized attacker to elevate privileges locally.
Why
The program can continue using memory after it has been released, producing unsafe and attacker-influenceable behaviour.
How
An attacker operating through local access may attempt exploitation without authentication or user interaction. If successful, the issue may gain additional privileges.
What
Use after free in Microsoft Edge (Chromium-based) allows an unauthorized attacker to elevate privileges locally.
Why
The program can continue using memory after it has been released, producing unsafe and attacker-influenceable behaviour.
How
An attacker operating through local access may attempt exploitation without authentication or user interaction. If successful, the issue may gain additional privileges.
02
Exploit reality and attack path
CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.
Observed exploitation No confirmed evidence
?
Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.
Public PoC / exploit material None recorded
?
Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.
- Likely attack path
- local access → Use After Free → gain additional privileges
- Attack surface
- Local
- Privileges required
- None: unauthenticated exploitation is possible
- User interaction
- None
- Attack complexity
- High: exploitation depends on specific conditions
- Security boundary
- Changed: exploitation can affect a different security authority
- Weakness
?
CWE means Common Weakness Enumeration: a standard category for the underlying weakness. - CWE-416 ↗
CWE-416: Use After Free. The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.
- CVSS vector
?
CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity. CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:CCommon Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.
AVLocalAttack vector: The attacker needs local access to the vulnerable system.ACHighAttack complexity: Successful exploitation depends on specific conditions outside the attacker's direct control.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SChangedScope: The attack can affect a component governed by a different security authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.- Post-exploitation / living off the land
- The issue can support a local privilege or sandbox boundary transition; normal system utilities may then be available in the gained context.
03
Patch and workaround
Operational remediation based on structured source evidence.
- Status
?
Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change. - Patch available
- Action
- 153.0.4234.46:Security Update:https://docs.microsoft.com/en-us/DeployEdge/microsoft-edge-relnotes-security
- Workaround
- No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.
04
Evidence and provenance
Published 18 Sept 2026 · Last source change 7 Oct 2026, 15:05 UTC · CWE-416 · Use After Free
CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source FIRST · tracked since 2026-09-19
?
The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.European sourceENISA EUVD · EUVD-2026-83446
Product sourceVendor CSAF · Microsoft Security Response Center
Remediation sourceVendor CSAF · Microsoft Security Response Center
CWE sourceOther authority
NVD statusNVD enriched
Core structured fields are present and their contributing authorities are shown above.
Material change intelligence
View recent updates ↗What changed after publication
- Vendor guidanceAuthoritative vendor guidance changed: added vendor advisory: msrc.microsoft.com/CVE-2026-88097; removed patch: msrc.microsoft.com/CVE-2026-88097; removed remediation: msrc.microsoft.com/CVE-2026-88097.secure@microsoft.com ↗
- Before
- patch: msrc.microsoft.com/CVE-2026-88097 · remediation: msrc.microsoft.com/CVE-2026-88097
- After
- vendor advisory: msrc.microsoft.com/CVE-2026-88097
- Affected versionsThe structured affected or fixed version information changed.CNA ↗
- Before
- Microsoft Edge (Chromium-based): 1.0.0.0 < 153.0.4234.46 · Fixed: 153.0.4234.46:Security Update:https://docs.microsoft.com/en-us/DeployEdge/microsoft-edge-relnotes-security
- After
- Microsoft Edge (Chromium-based): 1.0.0.0 < 153.0.4234.46 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
- Remediation statusRemediation status changed from Patch available to Awaiting fix.secure@microsoft.com ↗
- Before
- Patch available
- After
- Awaiting fix
- Vendor guidanceAuthoritative vendor guidance changed: added vendor advisory: msrc.microsoft.com/CVE-2026-88097; removed patch: msrc.microsoft.com/CVE-2026-88097; removed remediation: msrc.microsoft.com/CVE-2026-88097.secure@microsoft.com ↗
- Before
- patch: msrc.microsoft.com/CVE-2026-88097 · remediation: msrc.microsoft.com/CVE-2026-88097
- After
- vendor advisory: msrc.microsoft.com/CVE-2026-88097
- Affected versionsThe structured affected or fixed version information changed.CNA ↗
- Before
- Microsoft Edge (Chromium-based): 1.0.0.0 < 153.0.4234.46 · Fixed: 153.0.4234.46:Security Update:https://docs.microsoft.com/en-us/DeployEdge/microsoft-edge-relnotes-security
- After
- Microsoft Edge (Chromium-based): 1.0.0.0 < 153.0.4234.46 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
- Remediation statusRemediation status changed from Patch available to Awaiting fix.secure@microsoft.com ↗
- Before
- Patch available
- After
- Awaiting fix
- Vendor guidanceAuthoritative vendor guidance changed: added vendor advisory: msrc.microsoft.com/CVE-2026-88097; removed patch: msrc.microsoft.com/CVE-2026-88097; removed remediation: msrc.microsoft.com/CVE-2026-88097.secure@microsoft.com ↗
- Before
- patch: msrc.microsoft.com/CVE-2026-88097 · remediation: msrc.microsoft.com/CVE-2026-88097
- After
- vendor advisory: msrc.microsoft.com/CVE-2026-88097
- Affected versionsThe structured affected or fixed version information changed.CNA ↗
- Before
- Microsoft Edge (Chromium-based): 1.0.0.0 < 153.0.4234.46 · Fixed: 153.0.4234.46:Security Update:https://docs.microsoft.com/en-us/DeployEdge/microsoft-edge-relnotes-security
- After
- Microsoft Edge (Chromium-based): 1.0.0.0 < 153.0.4234.46 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
- Remediation statusRemediation status changed from Patch available to Awaiting fix.secure@microsoft.com ↗
- Before
- Patch available
- After
- Awaiting fix
- Vendor guidanceAuthoritative vendor guidance changed: added vendor advisory: msrc.microsoft.com/CVE-2026-88097; removed patch: msrc.microsoft.com/CVE-2026-88097; removed remediation: msrc.microsoft.com/CVE-2026-88097.secure@microsoft.com ↗
- Before
- patch: msrc.microsoft.com/CVE-2026-88097 · remediation: msrc.microsoft.com/CVE-2026-88097
- After
- vendor advisory: msrc.microsoft.com/CVE-2026-88097
- Affected versionsThe structured affected or fixed version information changed.CNA ↗
- Before
- Microsoft Edge (Chromium-based): 1.0.0.0 < 153.0.4234.46 · Fixed: 153.0.4234.46:Security Update:https://docs.microsoft.com/en-us/DeployEdge/microsoft-edge-relnotes-security
- After
- Microsoft Edge (Chromium-based): 1.0.0.0 < 153.0.4234.46 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
- Remediation statusRemediation status changed from Patch available to Awaiting fix.secure@microsoft.com ↗
- Before
- Patch available
- After
- Awaiting fix
- Vendor guidanceAuthoritative vendor guidance changed: added vendor advisory: msrc.microsoft.com/CVE-2026-88097; removed patch: msrc.microsoft.com/CVE-2026-88097; removed remediation: msrc.microsoft.com/CVE-2026-88097.secure@microsoft.com ↗
- Before
- patch: msrc.microsoft.com/CVE-2026-88097 · remediation: msrc.microsoft.com/CVE-2026-88097
- After
- vendor advisory: msrc.microsoft.com/CVE-2026-88097
- Affected versionsThe structured affected or fixed version information changed.CNA ↗
- Before
- Microsoft Edge (Chromium-based): 1.0.0.0 < 153.0.4234.46 · Fixed: 153.0.4234.46:Security Update:https://docs.microsoft.com/en-us/DeployEdge/microsoft-edge-relnotes-security
- After
- Microsoft Edge (Chromium-based): 1.0.0.0 < 153.0.4234.46 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
- Remediation statusRemediation status changed from Patch available to Awaiting fix.secure@microsoft.com ↗
- Before
- Patch available
- After
- Awaiting fix
- Vendor guidanceAuthoritative vendor guidance changed: added vendor advisory: msrc.microsoft.com/CVE-2026-88097.secure@microsoft.com ↗
- Before
- no authoritative guidance recorded
- After
- vendor advisory: msrc.microsoft.com/CVE-2026-88097
- ENISA EUVD mappingEUVD-2026-83446 was added to the official ENISA EUVD mapping for this CVE.ENISA EUVD ↗
- Before
- not recorded
- After
- {"euvdId":"EUVD-2026-83446"}
- Catalogue recordCVE added to the BlackTree catalogue.CNA ↗
- Affected versionsThe structured affected or fixed version information changed.Microsoft Security Response Center ↗
- Before
- Microsoft Edge (Chromium-based): 1.0.0.0 < 153.0.4234.46 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
- After
- Microsoft Edge (Chromium-based): 1.0.0.0 < 153.0.4234.46 · Fixed: 153.0.4234.46:Security Update:https://docs.microsoft.com/en-us/DeployEdge/microsoft-edge-relnotes-security
- Remediation statusRemediation status changed from Awaiting fix to Patch available.Microsoft Security Response Center ↗
- Before
- Awaiting fix
- After
- Patch available
CVE published
Fixed release recorded from official guidance
Technical terms and abbreviations used in this report
- CVE
- Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
- CVSS
- Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
- EPSS
- Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
- CWE
- Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
- CNA
- CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
- CISA ADP
- Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
- NVD
- National Vulnerability Database: NIST's enrichment service for CVE records.
- CERT / CSIRT
- A computer security incident response team that publishes warnings or coordinates incident response.
- PoC
- Proof of concept: public material that demonstrates or helps reproduce exploitation.
- CSAF
- Common Security Advisory Framework: a machine-readable format for security advisories.
- LoTL
- Living off the land: abuse of legitimate tools or system functions during an attack.