CVE-2026-9597

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreMEDIUM confidence

Score 5.4 from GitHub Security Advisory published 2026-07-13. a secondary CVSS source baseline 5.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.4Exploit: 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 <= 11.7.2, 11.6.x <= 11.6.4 fail to verify whether a guest account is deactivated before creating a session in the magic-link token login path, which allows a deactivated guest user to obtain a fully functional session via a magic-link token issued prior to deactivation.. Mattermost Advisory ID: MMSA-2026-00681

CVSS v3
5.4
EG Score
5.4(medium)
EG Risk
24(Track)
EG Risk 24/100SSVC: 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
Severity54% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
14%
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-2026-9597(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 18× in last 7d / 86× 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 122 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-9597?
CVE-2026-9597 is a medium vulnerability published on July 13, 2026. Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4 fail to verify whether a guest account is deactivated before creating a session in the magic-link token login path, which allows a deactivated guest user to obtain a fully functional session via a magic-link token issued prior to deactivation..…
When was CVE-2026-9597 disclosed?
CVE-2026-9597 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-2026-9597 actively exploited?
CVE-2026-9597 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 86.3% of all scored CVEs.
What is the CVSS score of CVE-2026-9597?
CVE-2026-9597 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2026-9597?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-9597, 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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