CVE-2026-14298

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-08-13. a secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
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.

Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7, 10.11.x <= 10.11.22 fail to limit decompressed content size and enforce the configured maximum file size in the Boards archive import handler, which allows an authenticated user to cause memory exhaustion or unbounded disk consumption via a crafted .boardarchive file uploaded to the import endpoint.. Mattermost Advisory ID: MMSA-2026-00713

CVSS v3
6.5
EG Score
6.5(medium)
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
15%
KEV
Not listed

Published

August 13, 2026

Last Modified

September 14, 2026

Advisory Details (1)

Auto-updated Aug 13, 2026
No patch confirmed yet.
generic

Security Updates

https://mattermost.com/security-updates

Vendor Advisories for CVE-2026-14298(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 / 76× 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 102 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-14298?
CVE-2026-14298 is a medium vulnerability published on August 13, 2026. Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7, 10.11.x <= 10.11.22 fail to limit decompressed content size and enforce the configured maximum file size in the Boards archive import handler, which allows an authenticated user to cause memory exhaustion or unbounded disk…
When was CVE-2026-14298 disclosed?
CVE-2026-14298 was first published in the National Vulnerability Database on August 13, 2026, with the most recent update on September 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-14298 actively exploited?
CVE-2026-14298 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 84.6% of all scored CVEs.
What is the CVSS score of CVE-2026-14298?
CVE-2026-14298 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-14298?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-14298, 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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