CVE-2026-87556

MEDIUMNVD 4.34.3—
EchelonGraph scoreHIGH confidence

Score 4.3 from GitHub Security Advisory published 2026-09-09. NVD baseline CVSS 4.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
4.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.3Exploit: None knownExposed: 0

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

Missing authorization in Browser in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to bypass system access restrictions via a crafted HTML page. (Chromium security severity: Medium)

CVSS v3
4.3
Vendor severity
MEDIUMper Google (Chromium)Vendor's own band, not a CVSS rating — advisory text: (Chromium security severity: Medium)
EG Score
4.3(high)
EG Risk
19(Track)
EG Risk 19/100SSVC: 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
Severity43% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
15%
KEV
Not listed

Published

September 9, 2026

Last Modified

September 10, 2026

Advisory Details (2)

Auto-updated Sep 9, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic

Chromium

https://issues.chromium.org/issues/513192482
generic🔴 Active Exploitation

Chrome Releases: Stable Channel Update for Desktop

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

Vendor Advisories for CVE-2026-87556(1)

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

Weakness Classification(1)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 26× in last 7d / 59× 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.

  1. 2026-09-24 19:21 UTCEG score recompute
  2. 2026-09-24 19:21 UTCVendor advisory
  3. 2026-09-24 19:21 UTCGHSA enrichment
  4. 2026-09-24 14:04 UTCEPSS rescore
  5. 2026-09-23 19:38 UTCEG score recompute
  6. 2026-09-23 19:38 UTCVendor advisory
  7. 2026-09-23 19:38 UTCGHSA enrichment
  8. 2026-09-23 17:54 UTCEPSS rescore
  9. 2026-09-22 18:54 UTCEG score recompute
  10. 2026-09-22 18:54 UTCVendor advisory
  11. 2026-09-22 18:54 UTCGHSA enrichment
  12. 2026-09-22 16:01 UTCEPSS rescore
  13. 2026-09-21 21:09 UTCEPSS rescore
  14. 2026-09-21 19:11 UTCEG score recompute
  15. 2026-09-21 19:11 UTCVendor advisory
  16. 2026-09-21 19:11 UTCGHSA enrichment
  17. 2026-09-20 20:16 UTCEPSS rescore
  18. 2026-09-20 19:27 UTCVendor advisory
  19. 2026-09-20 19:27 UTCGHSA enrichment
  20. 2026-09-19 19:44 UTCEG score recompute
  21. 2026-09-19 19:44 UTCVendor advisory
  22. 2026-09-19 19:44 UTCGHSA enrichment
  23. 2026-09-18 20:00 UTCEG score recompute
  24. 2026-09-18 20:00 UTCVendor advisory
  25. 2026-09-18 20:00 UTCGHSA enrichment
Show 34 more
  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-17 20:15 UTCEG score recompute
  3. 2026-09-17 20:15 UTCVendor advisory
  4. 2026-09-17 20:15 UTCGHSA enrichment
  5. 2026-09-17 19:32 UTCEPSS rescore
  6. 2026-09-16 18:13 UTCEG score recompute
  7. 2026-09-16 18:13 UTCVendor advisory
  8. 2026-09-16 18:13 UTCGHSA enrichment
  9. 2026-09-16 14:09 UTCEPSS rescore
  10. 2026-09-16 05:15 UTCEPSS rescore
  11. 2026-09-15 18:16 UTCEG score recompute
  12. 2026-09-15 18:16 UTCVendor advisory
  13. 2026-09-15 18:16 UTCGHSA enrichment
  14. 2026-09-15 03:12 UTCEPSS rescore
  15. 2026-09-15 03:12 UTCEPSS rescore
  16. 2026-09-14 18:17 UTCGHSA enrichment
  17. 2026-09-13 18:32 UTCEG score recompute
  18. 2026-09-13 18:32 UTCGHSA enrichment
  19. 2026-09-12 18:49 UTCEG score recompute
  20. 2026-09-12 18:49 UTCGHSA enrichment
  21. 2026-09-11 19:05 UTCEG score recompute
  22. 2026-09-11 19:05 UTCGHSA enrichment
  23. 2026-09-11 14:53 UTCEPSS rescore
  24. 2026-09-11 14:53 UTCEPSS rescore
  25. 2026-09-10 19:19 UTCGHSA enrichment
  26. 2026-09-10 18:25 UTCEG score recompute
  27. 2026-09-10 18:25 UTCGHSA enrichment
  28. 2026-09-09 20:47 UTCEG score recompute▼ 2.20
  29. 2026-09-09 20:47 UTCGHSA enrichment
  30. 2026-09-09 20:29 UTCNVD updateCVSS v3 → 4.3 · severity → MEDIUM
  31. 2026-09-09 15:56 UTCGHSA enrichment
  32. 2026-09-09 01:22 UTCNVD update
  33. 2026-09-09 01:00 UTCEG score recompute
  34. 2026-09-09 00:57 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-87556?
CVE-2026-87556 is a medium vulnerability published on September 9, 2026. Missing authorization in Browser in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to bypass system access restrictions via a crafted HTML page. (Chromium security severity: Medium)
When was CVE-2026-87556 disclosed?
CVE-2026-87556 was first published in the National Vulnerability Database on September 9, 2026, with the most recent update on September 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-87556 actively exploited?
CVE-2026-87556 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 84.6% of all scored CVEs.
What is the CVSS score of CVE-2026-87556?
CVE-2026-87556 has a CVSS v3 base score of 4.3 (NVD).
How do I remediate CVE-2026-87556?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-87556, 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-2026-87556

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