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VulnerabilityCVE-2026-12457Published 2026-06-17

CVE-2026-12457 — Google Chrome

mediumPublic exploit1 PoC repo

As of 2026-06-17, CVE-2026-12457 is a MEDIUM-severity vulnerability in Google Chrome, CVSS v3.1 4.2, EPSS 0.1% (2.6th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-12457, most recently “Google Chrome 149 Multiple Memory-Corruption Vulnerabilities Enable Arbitrary Code Execution (CVE-2026-12437 through CVE-2026-12469)”.

CVSS v3.1
4.2/10Medium
EPSS
0.1%Higher than 2.6% of scored CVEs
CISA KEV
NoNot in the KEV catalog
Tracked threats
1Campaigns referencing it
Priority
4.2/10Threadlinqs triage score
Published
CVSS v3.1 4.2 (MEDIUM) · EPSS 0.1% (higher than 2.6% of all scored CVEs) · Priority 4.2/10 · Published 2026-06-17

Last updated:

What is CVE-2026-12457?

Inappropriate implementation in Extensions in Google Chrome prior to 149.0.7827.155 allowed a remote attacker who had compromised the renderer process to bypass site isolation via a crafted HTML page. (Chromium security severity: High)

The record classifies CVE-2026-12457 under weakness class CWE-693. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs a user to take an action first. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 133 days ago.

Severity and exploitation probability

CVSS v3.1 base score
4.2 — MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
EPSS (FIRST)
0.1% probability of exploitation in the next 30 days, higher than 2.6% of all scored CVEs
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
4.2/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2026-06-17

Is CVE-2026-12457 being exploited?

Weaponised exploit code for CVE-2026-12457 is publicly available. 1 public proof-of-concept repository is tracked for this identifier. It currently carries a trending score of 15 in the Threadlinqs vulnerability feed.

Affected products and versions

How to fix CVE-2026-12457

Vendor advisory: https://chromereleases.googleblog.com/2026/06/stable-channel-update-for-desktop_01750511403.html. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

Threat activity tracking CVE-2026-12457

1 tracked threat in the Threadlinqs corpus references CVE-2026-12457, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Enriched from CVE.org, NVD, FIRST EPSS, public proof-of-concept repositories. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.

Other references