Microsoft Edge: Use-after-free vulnerability allows remote code execution
Summary
A use-after-free vulnerability (CWE-416) in Microsoft Edge allows an unauthorized attacker to execute code over a network. The description also refers to Edge for iOS, while the affected products are listed as Chromium-based Edge. The CNA rates the issue at CVSS 3.1 8.8 with high impact on confidentiality, integrity and availability, and exploitation requires a user to visit a malicious page or perform a similar action but no privileges. VulDB scores the issue lower (6.3), so the severity assessment is inconsistent across sources.
Affected
- Microsoft Edge (Chromium-based) from 1.0.0.0 before 155.0.4283.45 (CNA record)
- VulDB lists an affected range up to 154.0.4258.62
- Edge for iOS: affected build unknown
Fixed in
- Microsoft Edge (Chromium-based): 155.0.4283.45
- Edge for iOS: no confirmed fixed version; verify on the MSRC page
Workaround
Unknown. No vendor workaround found. Updating is the only known mitigation.
Exploitation
- Not known to be exploited in the wild (OffSeq). CISA SSVC: exploitation none, not automatable
- No public proof of concept found in the sources checked
- The EPSS value of 0.59 % could not be verified
Our recommendation
- Update all desktop Edge installations to 155.0.4283.45 or later, prioritising the fleet via MDM or management tools
- Check Edge for iOS on iPhones and iPads used for business, install the latest App Store update and verify the version against the MSRC page
- Make staff aware of phishing and malicious links, since user interaction is required
- Monitor the MSRC advisory for updates
Information from Microsoft (Patch Tuesday October 2026)
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Response Center advisory msrc.microsoft.com
- VulDB entry vuldb.com
- OffSeq record (exploitation status, fixed version) radar.offseq.com
- PSIRT record (CVSS vector) psirt.com
- CVE record mirror (CVE.org/NVD fields) cve.threatint.com
- Strix record (affected range) www.strix.ai
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 31 Oct 2026, 09:01.
Original description (NVD)
Use after free in Microsoft Edge for iOS allows an unauthorized attacker to execute code over a network.
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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