Inappropriate implementation in Serial in Google Chrome prior to 149.0.7827.155 allowed a remote attacker to inject arbitrary scripts or HTML (UXSS) via a crafted HTML page. (Chromium security severity: High)
CVE-2026-12459
MEDIUMPre-NVD 6.16.1—
EchelonGraph scoreHIGH confidence
Score 6.1 from GitHub Security Advisory published 2026-06-17. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 6.1; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
6.1
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.1Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 6.1
- EG Score
- 6.1(high)
- EPSS
- 7.8%
- KEV
- Not listed
Published
June 17, 2026
Last Modified
June 17, 2026
Advisory Details (2)
Auto-updated Jun 19, 2026No patch confirmed yet.
generic
Chrome Releases: Stable Channel Update for Desktop
https://chromereleases.googleblog.com/2026/06/stable-channel-update-for-desktop_01750511403.htmlVendor Advisories for CVE-2026-12459(2)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Frequently asked(5)
What is CVE-2026-12459?
CVE-2026-12459 is a medium vulnerability published on June 17, 2026. Inappropriate implementation in Serial in Google Chrome prior to 149.0.7827.155 allowed a remote attacker to inject arbitrary scripts or HTML (UXSS) via a crafted HTML page. (Chromium security severity: High)
When was CVE-2026-12459 disclosed?
CVE-2026-12459 was first published in the National Vulnerability Database on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-12459 actively exploited?
CVE-2026-12459 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 7.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-12459?
CVE-2026-12459 has a CVSS v3.1 base score of 6.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-12459?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-12459, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-12459
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