A logic issue was addressed with improved checks. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.6, macOS Tahoe 26.7. An app may bypass Gatekeeper checks.
CVE-2026-28899
MEDIUMPre-NVD 5.55.5—Trending — 5 sources updated this week
EchelonGraph scoreHIGH confidence
Score 5.5 from GitHub Security Advisory published 2026-09-14. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 5.5; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 5.5
- EG Score
- 5.5(high)
- EG Risk
- 25(Track)EG Risk 25/100SSVC: 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 computedSeverity55% × 45%Exploitation0% × 40%Automatability0% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 0%
- EPSS %ILE
- 5%
- KEV
- Not listed
Published
September 14, 2026
Last Modified
September 17, 2026
Advisory Details (4)
Auto-updated Sep 16, 2026No patch confirmed yet.
generic
About the security content of macOS Sequoia 15.8 - Apple Support
https://support.apple.com/en-us/149043generic
About the security content of macOS Tahoe 26.7 - Apple Support
https://support.apple.com/en-us/149042generic
About the security content of macOS Golden Gate 27 - Apple Support
https://support.apple.com/en-us/149035generic
About the security content of macOS Tahoe 26.6 - Apple Support
https://support.apple.com/en-us/128067Vendor Advisories for CVE-2026-28899(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.
Data Freshness Timeline
(refreshed 19× in last 7d / 19× 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.
- 2026-09-19 17:52 UTCEG score recompute
- 2026-09-19 17:52 UTCGHSA enrichment
- 2026-09-18 19:28 UTCEPSS rescore
- 2026-09-18 19:27 UTCEPSS rescore
- 2026-09-18 18:20 UTCEG score recompute
- 2026-09-18 18:20 UTCGHSA enrichment
- 2026-09-17 19:30 UTCEPSS rescore
- 2026-09-17 18:48 UTCEG score recompute
- 2026-09-17 18:47 UTCGHSA enrichment
- 2026-09-16 21:08 UTCGHSA enrichment
- 2026-09-16 19:44 UTCEG score recompute▲ 5.50
- 2026-09-16 19:44 UTCGHSA enrichment
- 2026-09-16 19:44 UTCMITRE cvelistV5CVSS v3 → 5.5 · severity → MEDIUM
- 2026-09-16 14:08 UTCEPSS rescore
- 2026-09-16 05:15 UTCEPSS rescore
- 2026-09-15 14:58 UTCGHSA enrichment
- 2026-09-14 21:22 UTCNVD update
- 2026-09-14 20:58 UTCEG score recompute
- 2026-09-14 20:54 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Same CWE
10 shownCWE-693
- CVE-2021-32835EG 9.9EPSS p91CRITICAL
- CVE-2019-10328EG 9.9CRITICAL
- CVE-2019-1003030EG 9.9 KEVEPSS p100CRITICAL
- CVE-2021-27497NVD 6.5EG 9.8CRITICAL
- CVE-2020-10887EG 9.8EPSS p91CRITICAL
- CVE-2017-3197EG 9.8EPSS p93CRITICAL
- CVE-2018-9318EG 9.8EPSS p91CRITICAL
- CVE-2018-9311EG 9.8EPSS p90CRITICAL
- CVE-2017-8864EG 9.8CRITICAL
- CVE-2013-2465EG 9.8 KEVEPSS p100CRITICAL
Frequently asked(5)
What is CVE-2026-28899?
CVE-2026-28899 is a medium vulnerability published on September 14, 2026. A logic issue was addressed with improved checks. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.6, macOS Tahoe 26.7. An app may bypass Gatekeeper checks.
When was CVE-2026-28899 disclosed?
CVE-2026-28899 was first published in the National Vulnerability Database on September 14, 2026, with the most recent update on September 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-28899 actively exploited?
CVE-2026-28899 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 94.5% of all scored CVEs.
What is the CVSS score of CVE-2026-28899?
CVE-2026-28899 has a CVSS v3.1 base score of 5.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-28899?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-28899, 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-2026-28899
Is Your Infrastructure Affected by CVE-2026-28899?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.