CVE-2026-7978

FAUCET Score

Inappropriate implementation in Companion in Google Chrome on Mac prior to 148.0.7778.96 allowed a remote attacker to perform OS-level privilege escalation via malicious network traffic. (Chromium security severity: Medium)

First published: May 6, 2026Last modified: May 7, 2026

Impacted Technologies

Vendor	Product	Version(s)	CPE
		< 148.0.7778.96CPE matchmatch criteria	cpe:2.3:a:google:chrome::::::::
		>= 148.0.7778.96, < 148.0.7778.96CPE match	cpe:2.3:a:google:chrome::::::::

CVSS Data

CVSS version used by this source: 3.1

8.1HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

Exploitability Score

2.2

Impact Score

5.9

CvssVersion

3.1

Exploit Intelligence

EPSS Score

0.24%

Probability of exploitation in next 30 days

EPSS Percentile

14.8%

Percentile rank of EPSS score among Peer Group

As of 2026-07-28

Model: v2026.06.15

This CVE's current EPSS score of 0.0024 is in the 2nd percentile among its peer group of 8,920 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

microsoftpatch availablevia msrc

Product: Microsoft Edge (Chromium-based)Fixed in: 148.0.3967.54

Vendor Advisories (1)

microsoft2026-May/CVE-2026-7978

Chromium: CVE-2026-7978 Inappropriate implementation in Companion

May 7, 2026

References

chromereleases.googleblog.com / 2026/05/stable-channel-update-for-desktop.html

Vendor Advisory

issues.chromium.org / issues/497828892

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