CVE-2026-10819

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH 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%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 11.6.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
6.5(high)
EG Risk
34(Track)
EG Risk 34/100SSVC: 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%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
15%
KEV
Not listed

Published

July 27, 2026

Last Modified

August 3, 2026

Advisory Details (1)

Auto-updated Jul 27, 2026
No patch confirmed 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 16× in last 7d / 82× 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. 2026-08-25 13:48 UTCEPSS rescore
  2. 2026-08-25 11:48 UTCEG score recompute
  3. 2026-08-25 11:48 UTCGHSA enrichment
  4. 2026-08-24 09:38 UTCGHSA enrichment
  5. 2026-08-23 07:28 UTCEG score recompute
  6. 2026-08-23 07:27 UTCGHSA enrichment
  7. 2026-08-23 00:19 UTCEPSS rescore
  8. 2026-08-22 05:17 UTCEG score recompute
  9. 2026-08-22 05:17 UTCGHSA enrichment
  10. 2026-08-21 23:48 UTCEPSS rescore
  11. 2026-08-21 03:07 UTCEG score recompute
  12. 2026-08-21 03:07 UTCGHSA enrichment
  13. 2026-08-20 22:55 UTCEPSS rescore
  14. 2026-08-20 00:56 UTCEG score recompute
  15. 2026-08-20 00:56 UTCGHSA enrichment
  16. 2026-08-19 17:03 UTCEPSS rescore
  17. 2026-08-18 22:37 UTCEG score recompute
  18. 2026-08-18 22:37 UTCGHSA enrichment
  19. 2026-08-18 13:48 UTCEPSS rescore
  20. 2026-08-17 20:26 UTCEG score recompute
  21. 2026-08-17 20:26 UTCGHSA enrichment
  22. 2026-08-16 18:17 UTCEG score recompute
  23. 2026-08-16 18:17 UTCGHSA enrichment
  24. 2026-08-16 14:56 UTCEPSS rescore
  25. 2026-08-16 02:14 UTCEPSS rescore
Show 57 more
  1. 2026-08-15 16:07 UTCEG score recompute
  2. 2026-08-15 16:07 UTCGHSA enrichment
  3. 2026-08-15 01:30 UTCEPSS rescore
  4. 2026-08-14 13:57 UTCEG score recompute
  5. 2026-08-14 13:57 UTCGHSA enrichment
  6. 2026-08-13 22:00 UTCEPSS rescore
  7. 2026-08-13 11:47 UTCEG score recompute
  8. 2026-08-13 11:47 UTCGHSA enrichment
  9. 2026-08-12 13:50 UTCEPSS rescore
  10. 2026-08-12 09:38 UTCEG score recompute
  11. 2026-08-12 09:38 UTCGHSA enrichment
  12. 2026-08-11 13:42 UTCEPSS rescore
  13. 2026-08-11 07:28 UTCEG score recompute
  14. 2026-08-11 07:28 UTCGHSA enrichment
  15. 2026-08-10 23:59 UTCEPSS rescore
  16. 2026-08-10 05:18 UTCEG score recompute
  17. 2026-08-10 05:18 UTCGHSA enrichment
  18. 2026-08-09 13:46 UTCEPSS rescore
  19. 2026-08-09 03:09 UTCEG score recompute
  20. 2026-08-09 03:09 UTCGHSA enrichment
  21. 2026-08-08 16:37 UTCEPSS rescore
  22. 2026-08-08 01:00 UTCEG score recompute
  23. 2026-08-08 01:00 UTCGHSA enrichment
  24. 2026-08-06 22:51 UTCEG score recompute
  25. 2026-08-06 22:50 UTCGHSA enrichment
  26. 2026-08-06 13:46 UTCEPSS rescore
  27. 2026-08-05 20:15 UTCEG score recompute
  28. 2026-08-05 20:15 UTCGHSA enrichment
  29. 2026-08-05 19:17 UTCEPSS rescore
  30. 2026-08-04 18:05 UTCEG score recompute
  31. 2026-08-04 18:05 UTCGHSA enrichment
  32. 2026-08-04 15:09 UTCEPSS rescore
  33. 2026-08-04 10:38 UTCEPSS rescore
  34. 2026-08-03 15:34 UTCEG score recompute
  35. 2026-08-03 15:34 UTCGHSA enrichment
  36. 2026-08-03 10:35 UTCEPSS rescore
  37. 2026-08-03 09:55 UTCGHSA enrichment
  38. 2026-08-02 07:45 UTCEG score recompute
  39. 2026-08-02 07:45 UTCGHSA enrichment
  40. 2026-08-02 02:26 UTCEPSS rescore
  41. 2026-08-01 05:35 UTCEG score recompute
  42. 2026-08-01 05:35 UTCGHSA enrichment
  43. 2026-08-01 04:15 UTCEPSS rescore
  44. 2026-07-31 03:23 UTCEG score recompute
  45. 2026-07-31 03:23 UTCGHSA enrichment
  46. 2026-07-30 16:27 UTCEPSS rescore
  47. 2026-07-30 01:30 UTCEPSS rescore
  48. 2026-07-30 01:13 UTCGHSA enrichment
  49. 2026-07-28 23:03 UTCEG score recompute
  50. 2026-07-28 23:03 UTCGHSA enrichment
  51. 2026-07-28 15:36 UTCEPSS rescore
  52. 2026-07-27 20:41 UTCGHSA enrichment
  53. 2026-07-27 16:24 UTCEG score recompute
  54. 2026-07-27 16:24 UTCGHSA enrichment
  55. 2026-07-27 15:22 UTCEG score recompute
  56. 2026-07-27 14:26 UTCEG score recompute
  57. 2026-07-27 14:25 UTCMITRE cvelistV5first tracked

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 in the National Vulnerability Database 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% probability of exploitation in the next 30 days, which ranks it in the top 85.2% of all scored CVEs.
What is the CVSS score of CVE-2026-10819?
CVE-2026-10819 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-10819?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-10819, 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-2026-10819

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