CVE-2026-6673

MEDIUMPre-NVD 6.46.4—
EchelonGraph scoreMEDIUM confidence

Score 6.4 from GitHub Security Advisory published 2026-06-22. a secondary CVSS source baseline 6.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
6.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.4Exploit: 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 <= 11.7.0, 11.6.x <= 11.6.2, 11.5.x <= 11.5.5, 10.11.x <= 10.11.17 fail to authenticate Atlassian Connect installed callbacks, allowing a remote unauthenticated attacker to inject a rogue sharedSecret and disrupt the Jira integration via POST to /ac/installed during the pending-install window.. Mattermost Advisory ID: MMSA-2026-00654

CVSS v3
6.4
EG Score
6.4(medium)
EG Risk
33(Track)
EG Risk 33/100SSVC: 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
Severity64% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
22%
KEV
Not listed

Published

June 22, 2026

Last Modified

June 23, 2026

Advisory Details (1)

Auto-updated Jun 22, 2026
No patch confirmed yet.
generic

Security Updates

https://mattermost.com/security-updates

Vendor Advisories for CVE-2026-6673(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 6× in last 7d / 51× 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 169 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-6673?
CVE-2026-6673 is a medium vulnerability published on June 22, 2026. Mattermost versions 11.7.x <= 11.7.0, 11.6.x <= 11.6.2, 11.5.x <= 11.5.5, 10.11.x <= 10.11.17 fail to authenticate Atlassian Connect installed callbacks, allowing a remote unauthenticated attacker to inject a rogue sharedSecret and disrupt the Jira integration via POST to /ac/installed during the…
When was CVE-2026-6673 disclosed?
CVE-2026-6673 was first published in the National Vulnerability Database on June 22, 2026, with the most recent update on June 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-6673 actively exploited?
CVE-2026-6673 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 77.7% of all scored CVEs.
What is the CVSS score of CVE-2026-6673?
CVE-2026-6673 has a CVSS v3 base score of 6.4 (NVD).
How do I remediate CVE-2026-6673?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-6673, 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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