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PatchSiren cyber security CVE debrief

CVE-2026-33118 Microsoft CVE debrief

CVE-2026-33118 is a medium severity vulnerability in Microsoft Edge (Chromium-based) that allows an unauthorized attacker to perform spoofing over a network. The vulnerability is due to user interface (UI) misrepresentation of critical information. This CVE was published on April 10, 2026, and was last modified on June 19, 2026. The CVSS score is 4.3, indicating a medium severity level. Defenders should assess their exposure and prioritize patching to limit the risk of spoofing attacks.

Vendor
Microsoft
Product
Edge Chromium
CVSS
MEDIUM 4.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-10
Original CVE updated
2026-06-19
Advisory published
2026-04-10
Advisory updated
2026-06-19

Who should care

Organizations and individuals using Microsoft Edge (Chromium-based) should be aware of this vulnerability. Given the medium severity and potential for spoofing, defenders should evaluate their exposure and consider applying patches or mitigations to reduce the risk of exploitation.

Technical summary

The vulnerability is caused by UI misrepresentation of critical information in Microsoft Edge (Chromium-based). An unauthorized attacker can exploit this vulnerability to perform spoofing over a network. The CVSS vector is CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N, indicating that the attack vector is network-based, authentication is not required, and user interaction is required. The weakness is classified as CWE-451.

Defensive priority

Medium priority due to potential for spoofing attacks over the network.

Recommended defensive actions

  • Apply the official patch from Microsoft as soon as possible.
  • Review and update Microsoft Edge (Chromium-based) to the latest version.
  • Limit exposure by restricting access to sensitive information.
  • Monitor for any suspicious activity related to Microsoft Edge.
  • Verify the integrity of Microsoft Edge installations.

Evidence notes

The primary evidence for this vulnerability comes from the NVD and CVE.org records. The vulnerability affects Microsoft Edge (Chromium-based) versions prior to 147.0.3912.60. Defenders should verify the version of Microsoft Edge in use and compare it to the patched version to determine exposure.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-33118 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-33118

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-33118 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-33118

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.