CVE-2026-12456

MEDIUMPre-NVD 4.24.2—
EchelonGraph scoreMEDIUM confidence

Score 4.2 from GitHub Security Advisory published 2026-06-17. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 4.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 4 sources updated this week
4.2EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.2Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Inappropriate implementation in Extensions in Google Chrome prior to 149.0.7827.155 allowed an attacker who convinced a user to install a malicious extension to bypass same origin policy via a crafted Chrome Extension. (Chromium security severity: High)

CVSS v3
4.2
Vendor severity
HIGHper Google (Chromium)Vendor's own band, not a CVSS rating — advisory text: (Chromium security severity: High)
EG Score
4.2(medium)
EG Risk
23(Track)
EG Risk 23/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity42% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

June 17, 2026

Last Modified

June 17, 2026

Advisory Details (2)

Auto-updated Jun 19, 2026
No patch confirmed yet.
generic

Chromium

https://issues.chromium.org/issues/517124587
generic

Chrome Releases: Stable Channel Update for Desktop

https://chromereleases.googleblog.com/2026/06/stable-channel-update-for-desktop_01750511403.html

Vendor Advisories for CVE-2026-12456(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
chromium100.0.4896.127-1 ... 99.0.4844.84-1~deb11u1 (500 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
chromium113.0.5672.126-1 ... 149.0.7827.53-1~deb13u1 (372 versions)149.0.7827.155-1~deb12u1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
chromium138.0.7204.183-1 ... 149.0.7827.53-1~deb13u1 (138 versions)149.0.7827.155-1~deb13u1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
chromium138.0.7204.183-1 ... 149.0.7827.53-1~deb13u1 (139 versions)149.0.7827.155-1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 43× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 225 total refreshes for this CVE.

  1. 2026-09-16 05:14 UTCEPSS rescore
  2. 2026-09-14 03:16 UTCEG score recompute
  3. 2026-09-14 03:16 UTCVendor advisory
  4. 2026-09-14 03:16 UTCGHSA enrichment
  5. 2026-09-13 16:46 UTCEPSS rescore
  6. 2026-09-12 15:00 UTCEPSS rescore
  7. 2026-09-11 14:52 UTCEPSS rescore
  8. 2026-09-11 09:36 UTCEPSS rescore
  9. 2026-09-10 09:34 UTCEPSS rescore
  10. 2026-09-08 22:00 UTCEPSS rescore
  11. 2026-09-07 16:01 UTCEPSS rescore
  12. 2026-09-06 13:47 UTCEPSS rescore
  13. 2026-09-04 05:06 UTCEPSS rescore
  14. 2026-09-01 13:53 UTCEPSS rescore
  15. 2026-09-01 04:39 UTCEPSS rescore
  16. 2026-08-30 22:30 UTCEG score recompute
  17. 2026-08-30 22:30 UTCVendor advisory
  18. 2026-08-30 22:30 UTCGHSA enrichment
  19. 2026-08-30 19:17 UTCEPSS rescore
  20. 2026-08-30 01:21 UTCEPSS rescore
  21. 2026-08-28 21:40 UTCEPSS rescore
  22. 2026-08-27 14:24 UTCEPSS rescore
  23. 2026-08-25 13:48 UTCEPSS rescore
  24. 2026-08-24 22:30 UTCEG score recompute
  25. 2026-08-24 22:30 UTCVendor advisory
Show 75 more
  1. 2026-08-24 22:30 UTCGHSA enrichment
  2. 2026-08-23 08:39 UTCEG score recompute
  3. 2026-08-23 08:39 UTCVendor advisory
  4. 2026-08-23 08:39 UTCGHSA enrichment
  5. 2026-08-23 00:19 UTCEPSS rescore
  6. 2026-08-21 23:48 UTCEPSS rescore
  7. 2026-08-21 07:25 UTCEG score recompute
  8. 2026-08-21 07:25 UTCVendor advisory
  9. 2026-08-21 07:25 UTCGHSA enrichment
  10. 2026-08-20 22:55 UTCEPSS rescore
  11. 2026-08-20 08:24 UTCEG score recompute
  12. 2026-08-20 08:24 UTCVendor advisory
  13. 2026-08-20 08:24 UTCGHSA enrichment
  14. 2026-08-19 17:03 UTCEPSS rescore
  15. 2026-08-19 08:18 UTCEG score recompute
  16. 2026-08-19 08:18 UTCVendor advisory
  17. 2026-08-19 08:17 UTCGHSA enrichment
  18. 2026-08-18 13:48 UTCEPSS rescore
  19. 2026-08-17 07:33 UTCEG score recompute
  20. 2026-08-17 07:33 UTCVendor advisory
  21. 2026-08-17 07:33 UTCGHSA enrichment
  22. 2026-08-16 14:56 UTCEPSS rescore
  23. 2026-08-16 08:39 UTCEG score recompute
  24. 2026-08-16 08:39 UTCVendor advisory
  25. 2026-08-16 08:39 UTCGHSA enrichment
  26. 2026-08-16 02:14 UTCEPSS rescore
  27. 2026-08-15 09:45 UTCEG score recompute
  28. 2026-08-15 09:45 UTCVendor advisory
  29. 2026-08-15 09:45 UTCGHSA enrichment
  30. 2026-08-15 01:30 UTCEPSS rescore
  31. 2026-08-14 08:42 UTCEG score recompute
  32. 2026-08-14 08:42 UTCGHSA enrichment
  33. 2026-08-13 22:00 UTCEPSS rescore
  34. 2026-08-13 09:49 UTCEG score recompute
  35. 2026-08-13 09:49 UTCVendor advisory
  36. 2026-08-13 09:49 UTCGHSA enrichment
  37. 2026-08-12 13:50 UTCEPSS rescore
  38. 2026-08-12 10:55 UTCEG score recompute
  39. 2026-08-12 10:55 UTCVendor advisory
  40. 2026-08-12 10:55 UTCGHSA enrichment
  41. 2026-08-11 13:42 UTCEPSS rescore
  42. 2026-08-11 12:01 UTCEG score recompute
  43. 2026-08-11 12:01 UTCVendor advisory
  44. 2026-08-11 12:01 UTCGHSA enrichment
  45. 2026-08-10 23:59 UTCEPSS rescore
  46. 2026-08-10 13:08 UTCVendor advisory
  47. 2026-08-10 13:08 UTCGHSA enrichment
  48. 2026-08-09 14:14 UTCEG score recompute
  49. 2026-08-09 14:14 UTCVendor advisory
  50. 2026-08-09 14:14 UTCGHSA enrichment
  51. 2026-08-08 16:37 UTCEPSS rescore
  52. 2026-08-08 15:21 UTCEG score recompute
  53. 2026-08-08 15:21 UTCVendor advisory
  54. 2026-08-08 15:21 UTCGHSA enrichment
  55. 2026-08-07 16:25 UTCVendor advisory
  56. 2026-08-07 16:25 UTCGHSA enrichment
  57. 2026-08-06 17:32 UTCEG score recompute
  58. 2026-08-06 17:32 UTCVendor advisory
  59. 2026-08-06 17:32 UTCGHSA enrichment
  60. 2026-08-06 13:46 UTCEPSS rescore
  61. 2026-08-05 19:17 UTCEPSS rescore
  62. 2026-08-05 18:38 UTCGHSA enrichment
  63. 2026-08-04 15:29 UTCEG score recompute
  64. 2026-08-04 15:29 UTCVendor advisory
  65. 2026-08-04 15:29 UTCGHSA enrichment
  66. 2026-08-04 15:09 UTCEPSS rescore
  67. 2026-08-04 10:38 UTCEPSS rescore
  68. 2026-08-03 10:35 UTCEPSS rescore
  69. 2026-08-03 08:49 UTCGHSA enrichment
  70. 2026-08-02 06:55 UTCEG score recompute
  71. 2026-08-02 06:55 UTCVendor advisory
  72. 2026-08-02 06:55 UTCGHSA enrichment
  73. 2026-08-02 02:26 UTCEPSS rescore
  74. 2026-08-01 08:01 UTCEG score recompute
  75. 2026-08-01 08:01 UTCVendor advisory

Frequently asked(5)

What is CVE-2026-12456?
CVE-2026-12456 is a medium vulnerability published on June 17, 2026. Inappropriate implementation in Extensions in Google Chrome prior to 149.0.7827.155 allowed an attacker who convinced a user to install a malicious extension to bypass same origin policy via a crafted Chrome Extension. (Chromium security severity: High)
When was CVE-2026-12456 disclosed?
CVE-2026-12456 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-2026-12456 actively exploited?
CVE-2026-12456 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 96.5% of all scored CVEs.
What is the CVSS score of CVE-2026-12456?
CVE-2026-12456 has a CVSS v3.1 base score of 4.2 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-12456?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-12456, 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

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