CVE-2026-6850

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-07-13. 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 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to validate the length and content of message attachment field values, which allows an authenticated attacker to cause a denial of service for all users in a channel via a post containing a specially crafted payload that triggers catastrophic backtracking in the client-side markdown parser.. Mattermost Advisory ID: MMSA-2026-00658

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
36%
KEV
Not listed

Published

July 13, 2026

Last Modified

July 13, 2026

Advisory Details (1)

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

Security Updates

https://mattermost.com/security-updates

Vendor Advisories for CVE-2026-6850(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 10× in last 7d / 52× 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 152 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-6850?
CVE-2026-6850 is a medium vulnerability published on July 13, 2026. Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to validate the length and content of message attachment field values, which allows an authenticated attacker to cause a denial of service for all users in a channel via a post containing a specially crafted payload…
When was CVE-2026-6850 disclosed?
CVE-2026-6850 was first published in the National Vulnerability Database on July 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-6850 actively exploited?
CVE-2026-6850 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 64.0% of all scored CVEs.
What is the CVSS score of CVE-2026-6850?
CVE-2026-6850 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-6850?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-6850, 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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