CVE-2026-10819

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-07-27. 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: 0.4%CVSS: 6.5Exploit: None knownExposed services: Not assessed

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

Mattermost versions 11.6.x <= 11.6.5, 10.11.x <= 10.11.20, 11.8.x <= 11.8.1, 11.7.x <= 11.7.4 fail to limit the number of frames and enforce the file size cap on animated GIF uploads, which allows an authenticated attacker to cause a denial of service via a crafted animated GIF uploaded as a custom emoji.. Mattermost Advisory ID: MMSA-2026-00695

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
34
EG Risk 34/100CISA 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
Severity65% × 45%
Exploitation0% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.4%
EPSS %ILE
34th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). 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

July 27, 2026

Last Modified

August 3, 2026

Advisory Details (1)

Auto-updated Jul 27, 2026
No fix on record yet.
generic

Security Updates

https://mattermost.com/security-updates

Vendor Advisories for CVE-2026-10819(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 11× in last 7d / 55× 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 168 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-10819?
CVE-2026-10819 is a medium vulnerability published on July 27, 2026. Mattermost versions 11.6.x <= 11.6.5, 10.11.x <= 10.11.20, 11.8.x <= 11.8.1, 11.7.x <= 11.7.4 fail to limit the number of frames and enforce the file size cap on animated GIF uploads, which allows an authenticated attacker to cause a denial of service via a crafted animated GIF uploaded as a custom…
When was CVE-2026-10819 disclosed?
CVE-2026-10819 was first published on July 27, 2026, with the most recent update on August 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-10819 actively exploited?
CVE-2026-10819 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (34th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-10819?
CVE-2026-10819 has a CVSS base score of 6.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-10819?
No fix for CVE-2026-10819 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-10819 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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