CVE-2026-18809

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory published 2026-08-04. 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 — 3 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%CVSS: 6.5Exploit: None knownExposed: 0

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

Information disclosure in Firefox for Android and Firefox Focus for Android. This vulnerability was fixed in Firefox 153.0.3.

CVSS v3
6.5
EG Score
6.5(high)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
12%
KEV
Not listed

Published

August 4, 2026

Last Modified

August 18, 2026

Advisory Details (2)

Auto-updated Aug 4, 2026
No patch confirmed yet.
generic

Security Vulnerabilities fixed in Firefox for Android 153.0.3 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-73/
generic

Access Denied

https://bugzilla.mozilla.org/show_bug.cgi?id=2055683

Vendor Advisories for CVE-2026-18809(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 20× in last 7d / 54× 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. 2026-08-20 22:55 UTCEPSS rescore
  2. 2026-08-20 11:07 UTCEG score recompute
  3. 2026-08-20 11:07 UTCGHSA enrichment
  4. 2026-08-19 17:03 UTCEPSS rescore
  5. 2026-08-19 13:04 UTCGHSA enrichment
  6. 2026-08-18 14:56 UTCEG score recompute
  7. 2026-08-18 14:55 UTCGHSA enrichment
  8. 2026-08-18 13:48 UTCEPSS rescore
  9. 2026-08-18 13:16 UTCGHSA enrichment
  10. 2026-08-17 15:11 UTCEG score recompute
  11. 2026-08-17 15:11 UTCGHSA enrichment
  12. 2026-08-17 13:47 UTCEPSS rescore
  13. 2026-08-16 17:08 UTCEG score recompute
  14. 2026-08-16 17:08 UTCGHSA enrichment
  15. 2026-08-16 14:56 UTCEPSS rescore
  16. 2026-08-16 02:14 UTCEPSS rescore
  17. 2026-08-15 19:05 UTCEG score recompute
  18. 2026-08-15 19:05 UTCGHSA enrichment
  19. 2026-08-15 01:30 UTCEPSS rescore
  20. 2026-08-14 21:01 UTCGHSA enrichment
  21. 2026-08-13 22:58 UTCEG score recompute
  22. 2026-08-13 22:58 UTCGHSA enrichment
  23. 2026-08-13 22:00 UTCEPSS rescore
  24. 2026-08-13 00:56 UTCEG score recompute
  25. 2026-08-13 00:56 UTCGHSA enrichment
Show 29 more
  1. 2026-08-12 13:50 UTCEPSS rescore
  2. 2026-08-12 02:53 UTCEG score recompute
  3. 2026-08-12 02:53 UTCGHSA enrichment
  4. 2026-08-11 13:42 UTCEPSS rescore
  5. 2026-08-11 04:50 UTCEG score recompute
  6. 2026-08-11 04:50 UTCGHSA enrichment
  7. 2026-08-11 00:00 UTCEPSS rescore
  8. 2026-08-10 06:47 UTCEG score recompute
  9. 2026-08-10 06:47 UTCGHSA enrichment
  10. 2026-08-09 13:46 UTCEPSS rescore
  11. 2026-08-09 08:45 UTCEG score recompute
  12. 2026-08-09 08:45 UTCGHSA enrichment
  13. 2026-08-08 16:37 UTCEPSS rescore
  14. 2026-08-08 10:42 UTCEG score recompute
  15. 2026-08-08 10:42 UTCGHSA enrichment
  16. 2026-08-07 12:39 UTCGHSA enrichment
  17. 2026-08-06 14:36 UTCEG score recompute
  18. 2026-08-06 14:36 UTCGHSA enrichment
  19. 2026-08-06 13:46 UTCEPSS rescore
  20. 2026-08-05 19:17 UTCEPSS rescore
  21. 2026-08-05 16:33 UTCEG score recompute
  22. 2026-08-05 16:33 UTCGHSA enrichment
  23. 2026-08-04 18:25 UTCGHSA enrichment
  24. 2026-08-04 17:49 UTCEG score recompute▲ 6.50
  25. 2026-08-04 17:48 UTCGHSA enrichment
  26. 2026-08-04 17:46 UTCMITRE cvelistV5CVSS v3 → 6.5 · severity → MEDIUM
  27. 2026-08-04 13:26 UTCNVD update
  28. 2026-08-04 13:13 UTCEG score recompute
  29. 2026-08-04 13:13 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-18809?
CVE-2026-18809 is a medium vulnerability published on August 4, 2026. Information disclosure in Firefox for Android and Firefox Focus for Android. This vulnerability was fixed in Firefox 153.0.3.
When was CVE-2026-18809 disclosed?
CVE-2026-18809 was first published in the National Vulnerability Database on August 4, 2026, with the most recent update on August 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18809 actively exploited?
CVE-2026-18809 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 88.4% of all scored CVEs.
What is the CVSS score of CVE-2026-18809?
CVE-2026-18809 has a CVSS v3.1 base score of 6.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-18809?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18809, 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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