CVE-2026-78959

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-08-25. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 4 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 6.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Improper handling of case sensitivity in FileSystem in Google Chrome prior to 152.0.7977.65 allowed a remote attacker leveraging social engineering to bypass system access restrictions via a crafted HTML page. (Chromium security severity: Medium)

CVSS v3
6.5
Vendor severity
MEDIUMper Google (Chromium)Vendor's own band, not a CVSS rating — advisory text: (Chromium security severity: Medium)
EG Score
6.5MEDIUMmedium confidence
EG Risk
29
EG Risk 29/100CISA SSVC

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
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
28th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 25, 2026

Last Modified

August 31, 2026

Advisory Details (2)

Auto-updated Aug 28, 2026
Patch available.
generic

Chromium

https://issues.chromium.org/issues/518084889
generic

Chrome Releases: Stable Channel Update for Desktop

https://chromereleases.googleblog.com/2026/08/stable-channel-update-for-desktop_0256176589.html

Vendor Advisories for CVE-2026-78959(2)

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

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
chromium113.0.5672.126-1 ... 152.0.7977.64-1 (412 versions)
  • every version up to 152.0.7977.75-1~deb12u1: fixed in 152.0.7977.75-1~deb12u1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
chromium138.0.7204.183-1 ... 152.0.7977.75-1~deb12u1 (178 versions)
  • every version up to 152.0.7977.75-1~deb13u1: fixed in 152.0.7977.75-1~deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
chromium138.0.7204.183-1 ... 151.0.7922.71-1~deb13u1 (176 versions)
  • every version up to 152.0.7977.64-1: fixed in 152.0.7977.64-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 28× in last 7d / 112× 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 176 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-78959?
CVE-2026-78959 is a medium vulnerability published on August 25, 2026. Improper handling of case sensitivity in FileSystem in Google Chrome prior to 152.0.7977.65 allowed a remote attacker leveraging social engineering to bypass system access restrictions via a crafted HTML page. (Chromium security severity: Medium)
When was CVE-2026-78959 disclosed?
CVE-2026-78959 was first published on August 25, 2026, with the most recent update on August 31, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-78959 actively exploited?
CVE-2026-78959 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (28th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-78959?
CVE-2026-78959 has a CVSS v3.1 base score of 6.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-78959?
A fix for CVE-2026-78959 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-78959 are linked in the Vendor Advisories panel on this page.

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