We are aware that exploit code for this is public however we are not aware of any attacks in the wild abusing this flaw. This vulnerability was fixed in Firefox 152.0.6, Firefox ESR 140.13, and Thunderbird 140.13.
CVE-2026-15718
MEDIUMPre-NVD 4.34.3—Trending — 3 sources updated this week
EchelonGraph scoreHIGH confidence
Score 4.3 from GitHub Security Advisory published 2026-07-14. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 4.3; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
4.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 4.3Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 4.3
- EG Score
- 4.3(high)
- EPSS
- 7.7%
- KEV
- Not listed
Published
July 14, 2026
Last Modified
July 22, 2026
Advisory Details (2)
Auto-updated Jul 20, 2026⚠️ Active exploitation confirmed. No patch confirmed yet.
generic🔴 Active Exploitation
Security Vulnerabilities fixed in Firefox 152.0.6 — Mozilla
https://www.mozilla.org/security/advisories/mfsa2026-67/Vendor Advisories for CVE-2026-15718(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 8× in last 7d / 13× 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.
- 2026-07-22 14:08 UTCEPSS rescore
- 2026-07-21 15:24 UTCEPSS rescore
- 2026-07-20 17:08 UTCEPSS rescore
- 2026-07-19 14:30 UTCEPSS rescore
- 2026-07-19 02:28 UTCEPSS rescore
- 2026-07-17 06:50 UTCEG score recompute▲ 4.30
- 2026-07-17 06:50 UTCGHSA enrichment
- 2026-07-16 17:02 UTCEPSS rescore
- 2026-07-15 16:57 UTCEPSS rescore
- 2026-07-14 13:55 UTCMITRE cvelistV5CVSS v3 → 4.3 · severity → MEDIUM
- 2026-07-14 13:19 UTCNVD update
- 2026-07-14 12:40 UTCEG score recompute
- 2026-07-14 12:40 UTCMITRE cvelistV5first tracked
Frequently asked(5)
What is CVE-2026-15718?
CVE-2026-15718 is a medium vulnerability published on July 14, 2026. We are aware that exploit code for this is public however we are not aware of any attacks in the wild abusing this flaw. This vulnerability was fixed in Firefox 152.0.6, Firefox ESR 140.13, and Thunderbird 140.13.
When was CVE-2026-15718 disclosed?
CVE-2026-15718 was first published in the National Vulnerability Database on July 14, 2026, with the most recent update on July 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-15718 actively exploited?
CVE-2026-15718 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 7.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-15718?
CVE-2026-15718 has a CVSS v3.1 base score of 4.3 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-15718?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-15718, 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-2026-15718
Is Your Infrastructure Affected by CVE-2026-15718?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.