CVE-2026-87553

HIGHPre-NVD 8.38.3
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 8.3 from GitHub Security Advisory (severity: HIGH) published 2026-09-09. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 8.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: CISA-ADP (Vulnrichment) CVSS v3.1, EPSS, GitHub Security Advisory
Trending — 4 sources updated this week
8.3EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 8.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Improper input validation in SiteIsolation in Google Chrome prior to 153.0.8010.36 allowed a remote attacker who had compromised the renderer process to potentially execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: Medium)

CVSS v3
8.3
Vendor severity
MEDIUMper Google (Chromium)Vendor's own band, not a CVSS rating — advisory text: (Chromium security severity: Medium)
EG Score
8.3HIGHmedium confidence
EG Risk
38
EG Risk 38/100

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 (value × EchelonGraph’s weight)
Severity83% × 45%
The EG Score, 8.3 of 10.
Exploitation0.4% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
35th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

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

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

September 9, 2026

Last Modified

September 10, 2026

Advisory Details (2)

Auto-updated Sep 9, 2026
Patch available.
Web page

Chromium

https://issues.chromium.org/issues/496595299
Web page

Chrome Releases: Stable Channel Update for Desktop

https://chromereleases.googleblog.com/2026/09/stable-channel-update-for-desktop_0808145027.html

Vendor Advisories for CVE-2026-87553(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 ... 153.0.8010.47-2~deb13u1 (422 versions)
  • every version up to 153.0.8010.52-1~deb12u1: fixed in 153.0.8010.52-1~deb12u1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
chromium138.0.7204.183-1 ... 153.0.8010.47-2~deb12u1 (185 versions)
  • every version up to 153.0.8010.47-2~deb13u1: fixed in 153.0.8010.47-2~deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
chromium138.0.7204.183-1 ... 152.0.7977.82-1~deb13u1 (183 versions)
  • every version up to 153.0.8010.47-1: fixed in 153.0.8010.47-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 33× in last 7d / 159× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 184 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 84 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  2. 2026-10-13 05:08 UTCEG score recompute
  3. 2026-10-13 05:08 UTCVendor advisory
  4. 2026-10-13 05:08 UTCGHSA enrichmentGHSA-vfp7-2x6m-rmp3 · GitHub severity HIGH · GitHub CVSS 8.3
  5. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  6. 2026-10-12 14:50 UTCEG score recompute
  7. 2026-10-11 19:16 UTCEG score recompute
  8. 2026-10-11 16:33 UTCEG score recompute
  9. 2026-10-11 14:28 UTCEG score recompute
  10. 2026-10-11 14:28 UTCVendor advisory
  11. 2026-10-11 14:28 UTCGHSA enrichmentGHSA-vfp7-2x6m-rmp3 · GitHub severity HIGH · GitHub CVSS 8.3
  12. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  13. 2026-10-11 13:49 UTCEG score recompute
  14. 2026-10-11 00:04 UTCEG score recompute
  15. 2026-10-11 00:04 UTCVendor advisory
  16. 2026-10-11 00:04 UTCGHSA enrichmentGHSA-vfp7-2x6m-rmp3 · GitHub severity HIGH · GitHub CVSS 8.3
  17. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  18. 2026-10-10 09:11 UTCVendor advisory
  19. 2026-10-10 09:11 UTCGHSA enrichmentGHSA-vfp7-2x6m-rmp3 · GitHub severity HIGH · GitHub CVSS 8.3
  20. 2026-10-09 20:19 UTCEG score recompute
  21. 2026-10-09 20:19 UTCVendor advisory
  22. 2026-10-09 20:19 UTCGHSA enrichmentGHSA-vfp7-2x6m-rmp3 · GitHub severity HIGH · GitHub CVSS 8.3
  23. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  24. 2026-10-09 00:20 UTCEG score recompute
  25. 2026-10-09 00:20 UTCVendor advisory
Show 75 more
  1. 2026-10-09 00:19 UTCGHSA enrichmentGHSA-vfp7-2x6m-rmp3 · GitHub severity HIGH · GitHub CVSS 8.3
  2. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  3. 2026-10-08 09:10 UTCEG score recompute
  4. 2026-10-08 09:10 UTCVendor advisory
  5. 2026-10-08 09:10 UTCGHSA enrichmentGHSA-vfp7-2x6m-rmp3 · GitHub severity HIGH · GitHub CVSS 8.3
  6. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  7. 2026-10-07 20:18 UTCVendor advisory
  8. 2026-10-07 20:18 UTCGHSA enrichmentGHSA-vfp7-2x6m-rmp3 · GitHub severity HIGH · GitHub CVSS 8.3
  9. 2026-10-07 07:27 UTCVendor advisory
  10. 2026-10-07 07:27 UTCGHSA enrichmentGHSA-vfp7-2x6m-rmp3 · GitHub severity HIGH · GitHub CVSS 8.3
  11. 2026-10-06 18:35 UTCEG score recompute
  12. 2026-10-06 18:35 UTCVendor advisory
  13. 2026-10-06 18:35 UTCGHSA enrichmentGHSA-vfp7-2x6m-rmp3 · GitHub severity HIGH · GitHub CVSS 8.3
  14. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  15. 2026-10-06 05:39 UTCEG score recompute
  16. 2026-10-06 05:39 UTCVendor advisory
  17. 2026-10-06 05:39 UTCGHSA enrichmentGHSA-vfp7-2x6m-rmp3 · GitHub severity HIGH · GitHub CVSS 8.3
  18. 2026-10-05 17:44 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  19. 2026-10-05 16:25 UTCVendor advisory
  20. 2026-10-05 16:25 UTCGHSA enrichmentGHSA-vfp7-2x6m-rmp3 · GitHub severity HIGH · GitHub CVSS 8.3
  21. 2026-10-05 03:15 UTCEG score recompute
  22. 2026-10-05 03:15 UTCVendor advisory
  23. 2026-10-05 03:15 UTCGHSA enrichmentGHSA-vfp7-2x6m-rmp3 · GitHub severity HIGH · GitHub CVSS 8.3
  24. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  25. 2026-10-04 13:59 UTCVendor advisory
  26. 2026-10-04 13:59 UTCGHSA enrichmentGHSA-vfp7-2x6m-rmp3 · GitHub severity HIGH · GitHub CVSS 8.3
  27. 2026-10-04 01:07 UTCEG score recompute
  28. 2026-10-04 01:07 UTCVendor advisory
  29. 2026-10-04 01:07 UTCGHSA enrichmentGHSA-vfp7-2x6m-rmp3 · GitHub severity HIGH · GitHub CVSS 8.3
  30. 2026-10-03 12:13 UTCVendor advisory
  31. 2026-10-03 12:13 UTCGHSA enrichmentGHSA-vfp7-2x6m-rmp3 · GitHub severity HIGH · GitHub CVSS 8.3
  32. 2026-10-02 22:25 UTCEG score recompute
  33. 2026-10-02 22:25 UTCVendor advisory
  34. 2026-10-02 22:25 UTCGHSA enrichmentGHSA-vfp7-2x6m-rmp3 · GitHub severity HIGH · GitHub CVSS 8.3
  35. 2026-10-02 09:34 UTCVendor advisory
  36. 2026-10-02 09:34 UTCGHSA enrichmentGHSA-vfp7-2x6m-rmp3 · GitHub severity HIGH · GitHub CVSS 8.3
  37. 2026-10-01 20:43 UTCEG score recompute
  38. 2026-10-01 20:43 UTCVendor advisory
  39. 2026-10-01 20:43 UTCGHSA enrichmentGHSA-vfp7-2x6m-rmp3 · GitHub severity HIGH · GitHub CVSS 8.3
  40. 2026-10-01 19:51 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  41. 2026-10-01 07:44 UTCVendor advisory
  42. 2026-10-01 07:44 UTCGHSA enrichmentGHSA-vfp7-2x6m-rmp3 · GitHub severity HIGH · GitHub CVSS 8.3
  43. 2026-09-30 18:53 UTCEG score recompute
  44. 2026-09-30 18:53 UTCGHSA enrichmentGHSA-vfp7-2x6m-rmp3 · GitHub severity HIGH · GitHub CVSS 8.3
  45. 2026-09-30 15:04 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  46. 2026-09-30 06:01 UTCVendor advisory
  47. 2026-09-30 06:01 UTCGHSA enrichmentGHSA-vfp7-2x6m-rmp3 · GitHub severity HIGH · GitHub CVSS 8.3
  48. 2026-09-29 17:09 UTCEG score recompute
  49. 2026-09-29 17:09 UTCVendor advisory
  50. 2026-09-29 17:09 UTCGHSA enrichmentGHSA-vfp7-2x6m-rmp3 · GitHub severity HIGH · GitHub CVSS 8.3
  51. 2026-09-29 04:02 UTCEG score recompute
  52. 2026-09-29 04:02 UTCVendor advisory
  53. 2026-09-29 04:02 UTCGHSA enrichmentGHSA-vfp7-2x6m-rmp3 · GitHub severity HIGH · GitHub CVSS 8.3
  54. 2026-09-28 15:05 UTCEG score recompute
  55. 2026-09-28 15:05 UTCVendor advisory
  56. 2026-09-28 15:05 UTCGHSA enrichmentGHSA-vfp7-2x6m-rmp3 · GitHub severity HIGH · GitHub CVSS 8.3
  57. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  58. 2026-09-28 02:13 UTCEG score recompute
  59. 2026-09-28 02:13 UTCVendor advisory
  60. 2026-09-28 02:13 UTCGHSA enrichmentGHSA-vfp7-2x6m-rmp3 · GitHub severity HIGH · GitHub CVSS 8.3
  61. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  62. 2026-09-27 13:22 UTCVendor advisory
  63. 2026-09-27 13:22 UTCGHSA enrichmentGHSA-vfp7-2x6m-rmp3 · GitHub severity HIGH · GitHub CVSS 8.3
  64. 2026-09-27 00:31 UTCEG score recompute
  65. 2026-09-27 00:31 UTCVendor advisory
  66. 2026-09-27 00:30 UTCGHSA enrichmentGHSA-vfp7-2x6m-rmp3 · GitHub severity HIGH · GitHub CVSS 8.3
  67. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  68. 2026-09-26 11:39 UTCEG score recompute
  69. 2026-09-26 11:39 UTCVendor advisory
  70. 2026-09-26 11:39 UTCGHSA enrichmentGHSA-vfp7-2x6m-rmp3 · GitHub severity HIGH · GitHub CVSS 8.3
  71. 2026-09-25 22:47 UTCVendor advisory
  72. 2026-09-25 22:47 UTCGHSA enrichmentGHSA-vfp7-2x6m-rmp3 · GitHub severity HIGH · GitHub CVSS 8.3
  73. 2026-09-25 08:21 UTCVendor advisory
  74. 2026-09-25 08:21 UTCGHSA enrichmentGHSA-vfp7-2x6m-rmp3 · GitHub severity HIGH · GitHub CVSS 8.3
  75. 2026-09-24 19:29 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-87553?
CVE-2026-87553 is a high-severity vulnerability; its CVE record was published on September 9, 2026. Improper input validation in SiteIsolation in Google Chrome prior to 153.0.8010.36 allowed a remote attacker who had compromised the renderer process to potentially execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: Medium)
When was the CVE record for CVE-2026-87553 published?
The CVE record for CVE-2026-87553 was published on September 9, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 10, 2026; the record at its source may have been updated since.
Is CVE-2026-87553 actively exploited?
CVE-2026-87553 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (35th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-87553?
CVE-2026-87553 has a CVSS v3.1 base score of 8.3 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-87553?
A fix for CVE-2026-87553 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-87553 are linked in the Vendor Advisories panel on this page.

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