CVE-2026-100823

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreHIGH confidence

Score 5.4 from GitHub Security Advisory published 2026-09-29. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 5.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 5 sources updated this week
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 5.4Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Spoofing issue in the Downloads component in Firefox for Android. This vulnerability was fixed in Firefox 157.

CVSS v3
5.4
EG Score
5.4MEDIUMhigh confidence
EG Risk
24
EG Risk 24/100CISA SSVC

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
Severity54% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
4th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

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

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 29, 2026

Last Modified

October 1, 2026

Advisory Details (2)

Auto-updated Sep 30, 2026
Patch available.
generic

Security Vulnerabilities fixed in Firefox 157 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-97/
generic Patch Available

2054384 - (CVE-2026-100823) Download completion notification truncates long filenames from the end, hiding the file extension

https://bugzilla.mozilla.org/show_bug.cgi?id=2054384

Vendor Advisories for CVE-2026-100823(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 21× in last 7d / 21× 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. 2026-10-04 23:21 UTCEPSS rescore
  2. 2026-10-04 13:55 UTCEG score recompute
  3. 2026-10-04 13:55 UTCGHSA enrichment
  4. 2026-10-03 14:25 UTCEPSS rescore
  5. 2026-10-03 13:06 UTCEG score recompute
  6. 2026-10-03 13:06 UTCGHSA enrichment
  7. 2026-10-02 12:16 UTCEG score recompute
  8. 2026-10-02 12:16 UTCGHSA enrichment
  9. 2026-10-01 19:49 UTCEPSS rescore
  10. 2026-10-01 11:27 UTCGHSA enrichment
  11. 2026-10-01 10:56 UTCEG score recompute
  12. 2026-10-01 10:56 UTCGHSA enrichment
  13. 2026-09-30 21:29 UTCGHSA enrichment
  14. 2026-09-30 20:26 UTCEG score recompute▲ 5.40
  15. 2026-09-30 20:26 UTCGHSA enrichment
  16. 2026-09-30 20:25 UTCMITRE cvelistV5CVSS v3 → 5.4 · severity → MEDIUM
  17. 2026-09-30 15:02 UTCEPSS rescore
  18. 2026-09-29 22:01 UTCGHSA enrichment
  19. 2026-09-29 13:35 UTCNVD update
  20. 2026-09-29 12:49 UTCEG score recompute
  21. 2026-09-29 12:48 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-100823?
CVE-2026-100823 is a medium vulnerability published on September 29, 2026. Spoofing issue in the Downloads component in Firefox for Android. This vulnerability was fixed in Firefox 157.
When was CVE-2026-100823 disclosed?
CVE-2026-100823 was first published on September 29, 2026, with the most recent update on October 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-100823 actively exploited?
CVE-2026-100823 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (4th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-100823?
CVE-2026-100823 has a CVSS v3.1 base score of 5.4 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-100823?
A fix for CVE-2026-100823 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-100823 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-100823

Explore →

Is Your Infrastructure Affected by CVE-2026-100823?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs