CVE-2026-28644

HIGHPre-NVD 7.87.8—
EchelonGraph scoreHIGH confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-08. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

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

In startNextMatchingActivity of ActivityTaskManagerService.java, there is a possible permission bypass due to a confused deputy. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.

CVSS v3
7.8
EG Score
7.8(high)
EG Risk
35(Track)
EG Risk 35/100SSVC: 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
Severity78% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
0%
KEV
Not listed

Published

September 8, 2026

Last Modified

September 15, 2026

Advisory Details (1)

Auto-updated Sep 10, 2026
No patch confirmed yet.
generic

Android Security Bulletin—September 2026  |  Android Open Source Project

https://source.android.com/docs/security/bulletin/2026/2026-09-01

Vendor Advisories for CVE-2026-28644(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 23× in last 7d / 41× 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. 2026-09-19 04:56 UTCEG score recompute
  2. 2026-09-19 04:56 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 19:27 UTCEPSS rescore
  5. 2026-09-18 16:35 UTCGHSA enrichment
  6. 2026-09-18 04:16 UTCGHSA enrichment
  7. 2026-09-17 15:56 UTCGHSA enrichment
  8. 2026-09-17 03:36 UTCGHSA enrichment
  9. 2026-09-16 15:16 UTCEG score recompute
  10. 2026-09-16 15:16 UTCGHSA enrichment
  11. 2026-09-16 14:08 UTCEPSS rescore
  12. 2026-09-16 05:15 UTCEPSS rescore
  13. 2026-09-16 02:56 UTCGHSA enrichment
  14. 2026-09-15 14:36 UTCGHSA enrichment
  15. 2026-09-15 06:40 UTCEG score recompute
  16. 2026-09-15 06:40 UTCGHSA enrichment
  17. 2026-09-14 18:20 UTCGHSA enrichment
  18. 2026-09-14 05:47 UTCGHSA enrichment
  19. 2026-09-13 17:28 UTCEG score recompute
  20. 2026-09-13 17:28 UTCGHSA enrichment
  21. 2026-09-13 16:47 UTCEPSS rescore
  22. 2026-09-13 05:08 UTCGHSA enrichment
  23. 2026-09-12 16:48 UTCGHSA enrichment
  24. 2026-09-12 04:28 UTCGHSA enrichment
  25. 2026-09-11 16:08 UTCEG score recompute
Show 16 more
  1. 2026-09-11 16:08 UTCGHSA enrichment
  2. 2026-09-11 14:52 UTCEPSS rescore
  3. 2026-09-11 03:45 UTCEG score recompute
  4. 2026-09-11 03:45 UTCGHSA enrichment
  5. 2026-09-10 15:25 UTCGHSA enrichment
  6. 2026-09-10 14:36 UTCEG score recompute▲ 7.80
  7. 2026-09-10 14:35 UTCGHSA enrichment
  8. 2026-09-10 14:35 UTCMITRE cvelistV5CVSS v3 → 7.8 · severity → HIGH
  9. 2026-09-10 09:34 UTCEPSS rescore
  10. 2026-09-10 04:37 UTCGHSA enrichment
  11. 2026-09-10 04:33 UTCNVD update
  12. 2026-09-10 04:05 UTCGHSA enrichment
  13. 2026-09-10 04:00 UTCMITRE cvelistV5
  14. 2026-09-08 19:30 UTCNVD update
  15. 2026-09-08 18:31 UTCEG score recompute
  16. 2026-09-08 18:29 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-28644?
CVE-2026-28644 is a high vulnerability published on September 8, 2026. In startNextMatchingActivity of ActivityTaskManagerService.java, there is a possible permission bypass due to a confused deputy. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.
When was CVE-2026-28644 disclosed?
CVE-2026-28644 was first published in the National Vulnerability Database on September 8, 2026, with the most recent update on September 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-28644 actively exploited?
CVE-2026-28644 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 100.0% of all scored CVEs.
What is the CVSS score of CVE-2026-28644?
CVE-2026-28644 has a CVSS v3.1 base score of 7.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-28644?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-28644, 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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