CVE-2026-15718

MEDIUMPre-NVD 4.34.3—
EchelonGraph scoreMEDIUM 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
Trending — 4 sources updated this week
4.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.3Exploit: None knownExposed: 0

A fix is available — apply it.

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.

CVSS v3
4.3
EG Score
4.3(medium)
EG Risk
20(Track)
EG Risk 20/100SSVC: 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
Severity43% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
40%
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/
generic

Access Denied

https://bugzilla.mozilla.org/show_bug.cgi?id=2045443

Vendor Advisories for CVE-2026-15718(20)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(21)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatfirefox-0:140.13.0-1.el8_42026-08-12redhat
redhatfirefox-0:140.13.0-1.el9_22026-08-12redhat
redhatfirefox-0:140.13.0-1.el10_02026-08-12redhat
redhatfirefox-0:140.13.0-1.el8_82026-08-12redhat
redhatfirefox-0:140.13.0-1.el7_92026-08-12redhat
redhatfirefox-0:140.13.0-1.el9_62026-08-12redhat
redhatfirefox-0:140.13.0-1.el8_62026-08-12redhat
redhatfirefox-0:140.13.0-1.el9_42026-08-12redhat
redhatthunderbird-0:140.13.0-1.el9_22026-08-11redhat
redhatthunderbird-0:140.13.0-1.el9_42026-08-11redhat
redhatthunderbird-0:140.13.0-1.el9_62026-08-11redhat
redhatthunderbird-0:140.13.0-1.el8_82026-08-11redhat
redhatthunderbird-0:140.13.0-1.el8_62026-08-11redhat
redhatthunderbird-0:140.13.0-1.el8_42026-08-11redhat
redhatthunderbird-0:140.13.0-1.el10_02026-08-11redhat
redhatthunderbird-0:140.13.0-1.el9_82026-08-04redhat
redhatthunderbird-0:140.13.0-1.el8_102026-08-04redhat
redhatfirefox-0:140.13.0-1.el9_82026-08-03redhat
redhatthunderbird-0:140.13.0-1.el10_22026-08-03redhat
redhatfirefox-0:140.13.0-1.el8_102026-07-28redhat
redhatfirefox-0:140.13.0-1.el10_22026-07-28redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(8 across 4 ecosystems)
Debian:11(2)
PackageVulnerable rangeFixed inDependents
firefox-esr102.1.0esr-1 ... 91.9.1esr-1~deb9u1 (283 versions)140.13.0esr-1~deb11u1—
thunderbird1:102.0.1-1 ... 1:91.9.0-1~deb9u1 (334 versions)1:140.13.0esr-1—
Debian:12(2)
PackageVulnerable rangeFixed inDependents
firefox-esr102.11.0esr-1 ... 140.9.1esr-1~deb13u1 (190 versions)140.13.0esr-1~deb12u1—
thunderbird1:102.11.0-1 ... 1:140.9.1esr-1~deb13u1 (218 versions)1:140.13.0esr-1—
Debian:13(2)
PackageVulnerable rangeFixed inDependents
firefox-esr128.13.0esr-1 ... 140.9.1esr-1~deb13u1 (66 versions)140.13.0esr-1~deb13u1—
thunderbird1:128.13.0esr-1 ... 1:140.9.1esr-1~deb13u1 (76 versions)1:140.13.0esr-2~deb13u1—
Debian:14(2)
PackageVulnerable rangeFixed inDependents
firefox-esr128.13.0esr-1 ... 140.9.1esr-1~deb13u1 (67 versions)140.13.0esr-1—
thunderbird1:128.13.0esr-1 ... 1:153.0.1esr-1 (84 versions)——

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 19× in last 7d / 108× 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.

Showing the most recent 100 of 142 total refreshes for this CVE.

  1. 2026-08-30 05:25 UTCEG score recompute
  2. 2026-08-30 05:25 UTCVendor advisory
  3. 2026-08-30 05:25 UTCGHSA enrichment
  4. 2026-08-30 01:22 UTCEPSS rescore
  5. 2026-08-28 21:41 UTCEPSS rescore
  6. 2026-08-27 14:25 UTCEPSS rescore
  7. 2026-08-27 05:09 UTCEG score recompute
  8. 2026-08-27 05:09 UTCVendor advisory
  9. 2026-08-27 05:08 UTCGHSA enrichment
  10. 2026-08-26 14:46 UTCEPSS rescore
  11. 2026-08-26 04:40 UTCEG score recompute
  12. 2026-08-26 04:40 UTCVendor advisory
  13. 2026-08-26 04:40 UTCGHSA enrichment
  14. 2026-08-25 13:48 UTCEPSS rescore
  15. 2026-08-25 04:03 UTCEG score recompute
  16. 2026-08-25 04:03 UTCVendor advisory
  17. 2026-08-25 04:03 UTCGHSA enrichment
  18. 2026-08-24 03:48 UTCVendor advisory
  19. 2026-08-24 03:48 UTCGHSA enrichment
  20. 2026-08-23 01:27 UTCEG score recompute
  21. 2026-08-23 01:27 UTCVendor advisory
  22. 2026-08-23 01:27 UTCGHSA enrichment
  23. 2026-08-23 00:19 UTCEPSS rescore
  24. 2026-08-22 01:10 UTCEG score recompute
  25. 2026-08-22 01:10 UTCVendor advisory
Show 75 more
  1. 2026-08-22 01:10 UTCGHSA enrichment
  2. 2026-08-21 23:49 UTCEPSS rescore
  3. 2026-08-21 00:54 UTCEG score recompute
  4. 2026-08-21 00:54 UTCVendor advisory
  5. 2026-08-21 00:54 UTCGHSA enrichment
  6. 2026-08-20 22:55 UTCEPSS rescore
  7. 2026-08-20 00:36 UTCEG score recompute
  8. 2026-08-20 00:36 UTCVendor advisory
  9. 2026-08-20 00:36 UTCGHSA enrichment
  10. 2026-08-19 17:03 UTCEPSS rescore
  11. 2026-08-18 22:18 UTCEG score recompute
  12. 2026-08-18 22:18 UTCVendor advisory
  13. 2026-08-18 22:18 UTCGHSA enrichment
  14. 2026-08-18 13:48 UTCEPSS rescore
  15. 2026-08-17 21:52 UTCEG score recompute
  16. 2026-08-17 21:52 UTCVendor advisory
  17. 2026-08-17 21:52 UTCGHSA enrichment
  18. 2026-08-17 13:47 UTCEPSS rescore
  19. 2026-08-16 18:32 UTCEG score recompute
  20. 2026-08-16 18:32 UTCVendor advisory
  21. 2026-08-16 18:32 UTCGHSA enrichment
  22. 2026-08-16 14:56 UTCEPSS rescore
  23. 2026-08-16 02:14 UTCEPSS rescore
  24. 2026-08-15 18:17 UTCEG score recompute
  25. 2026-08-15 18:17 UTCVendor advisory
  26. 2026-08-15 18:17 UTCGHSA enrichment
  27. 2026-08-15 01:30 UTCEPSS rescore
  28. 2026-08-14 18:01 UTCEG score recompute
  29. 2026-08-14 18:01 UTCVendor advisory
  30. 2026-08-14 18:01 UTCGHSA enrichment
  31. 2026-08-13 22:00 UTCEPSS rescore
  32. 2026-08-13 17:46 UTCEG score recompute
  33. 2026-08-13 17:46 UTCVendor advisory
  34. 2026-08-13 17:46 UTCGHSA enrichment
  35. 2026-08-12 17:16 UTCEG score recompute
  36. 2026-08-12 17:16 UTCVendor advisory
  37. 2026-08-12 17:16 UTCGHSA enrichment
  38. 2026-08-12 13:50 UTCEPSS rescore
  39. 2026-08-11 17:02 UTCEG score recompute
  40. 2026-08-11 17:02 UTCVendor advisory
  41. 2026-08-11 17:01 UTCGHSA enrichment
  42. 2026-08-11 13:42 UTCEPSS rescore
  43. 2026-08-11 00:00 UTCEPSS rescore
  44. 2026-08-10 16:46 UTCVendor advisory
  45. 2026-08-10 16:46 UTCGHSA enrichment
  46. 2026-08-09 16:27 UTCEG score recompute
  47. 2026-08-09 16:27 UTCVendor advisory
  48. 2026-08-09 16:27 UTCGHSA enrichment
  49. 2026-08-09 13:46 UTCEPSS rescore
  50. 2026-08-08 16:37 UTCEPSS rescore
  51. 2026-08-08 16:12 UTCEG score recompute
  52. 2026-08-08 16:12 UTCVendor advisory
  53. 2026-08-08 16:12 UTCGHSA enrichment
  54. 2026-08-07 15:56 UTCVendor advisory
  55. 2026-08-07 15:56 UTCGHSA enrichment
  56. 2026-08-06 15:41 UTCEG score recompute
  57. 2026-08-06 15:41 UTCVendor advisory
  58. 2026-08-06 15:41 UTCGHSA enrichment
  59. 2026-08-06 13:46 UTCEPSS rescore
  60. 2026-08-05 19:17 UTCEPSS rescore
  61. 2026-08-05 15:25 UTCEG score recompute
  62. 2026-08-05 15:25 UTCVendor advisory
  63. 2026-08-05 15:25 UTCGHSA enrichment
  64. 2026-08-04 15:10 UTCEPSS rescore
  65. 2026-08-04 14:06 UTCEG score recompute
  66. 2026-08-04 14:06 UTCVendor advisory
  67. 2026-08-04 14:06 UTCGHSA enrichment
  68. 2026-08-04 10:38 UTCEPSS rescore
  69. 2026-08-03 13:51 UTCEG score recompute
  70. 2026-08-03 13:51 UTCVendor advisory
  71. 2026-08-03 13:51 UTCGHSA enrichment
  72. 2026-08-03 10:35 UTCEPSS rescore
  73. 2026-08-02 13:36 UTCEG score recompute
  74. 2026-08-02 13:36 UTCVendor advisory
  75. 2026-08-02 13:36 UTCGHSA enrichment

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 0% probability of exploitation in the next 30 days, which ranks it in the top 60.0% of all scored CVEs.
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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-15718

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