CVE-2026-7521

MEDIUMPre-NVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-07-28. a secondary CVSS source baseline 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: None knownExposed: 0

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

Mattermost versions 11.8.x <= 11.8.0, 11.7.x <= 11.7.3, 11.6.x <= 11.6.5, 10.11.x <= 10.11.20 fail to verify file deletion path which allows an admin with SAML system-console write permissions to delete arbitrary files outside the config directory from the server via the remove file endpoint.. Mattermost Advisory ID: MMSA-2026-00666

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
25(Track)
EG Risk 25/100SSVC: 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
Severity55% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
20%
KEV
Not listed

Published

July 28, 2026

Last Modified

July 29, 2026

Advisory Details (1)

Auto-updated Jul 28, 2026
No patch confirmed yet.
generic

Security Updates

https://mattermost.com/security-updates

Vendor Advisories for CVE-2026-7521(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 15× in last 7d / 83× 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. 2026-08-30 01:22 UTCEPSS rescore
  2. 2026-08-29 23:33 UTCEG score recompute
  3. 2026-08-29 23:33 UTCGHSA enrichment
  4. 2026-08-28 21:42 UTCEPSS rescore
  5. 2026-08-27 14:25 UTCEPSS rescore
  6. 2026-08-27 10:12 UTCEG score recompute
  7. 2026-08-27 10:12 UTCGHSA enrichment
  8. 2026-08-26 14:47 UTCEPSS rescore
  9. 2026-08-26 08:39 UTCEG score recompute
  10. 2026-08-26 08:39 UTCGHSA enrichment
  11. 2026-08-25 13:49 UTCEPSS rescore
  12. 2026-08-25 07:02 UTCEG score recompute
  13. 2026-08-25 07:02 UTCGHSA enrichment
  14. 2026-08-24 14:18 UTCEPSS rescore
  15. 2026-08-24 05:29 UTCGHSA enrichment
  16. 2026-08-23 03:57 UTCEG score recompute
  17. 2026-08-23 03:57 UTCGHSA enrichment
  18. 2026-08-23 00:19 UTCEPSS rescore
  19. 2026-08-22 02:24 UTCEG score recompute
  20. 2026-08-22 02:24 UTCGHSA enrichment
  21. 2026-08-21 23:49 UTCEPSS rescore
  22. 2026-08-21 00:50 UTCEG score recompute
  23. 2026-08-21 00:50 UTCGHSA enrichment
  24. 2026-08-20 22:56 UTCEPSS rescore
  25. 2026-08-19 23:18 UTCEG score recompute
Show 69 more
  1. 2026-08-19 23:18 UTCGHSA enrichment
  2. 2026-08-19 17:04 UTCEPSS rescore
  3. 2026-08-18 21:45 UTCEG score recompute
  4. 2026-08-18 21:45 UTCGHSA enrichment
  5. 2026-08-18 13:49 UTCEPSS rescore
  6. 2026-08-18 13:49 UTCEPSS rescore
  7. 2026-08-17 19:57 UTCEG score recompute
  8. 2026-08-17 19:57 UTCGHSA enrichment
  9. 2026-08-17 13:47 UTCEPSS rescore
  10. 2026-08-16 17:42 UTCEG score recompute
  11. 2026-08-16 17:42 UTCGHSA enrichment
  12. 2026-08-16 14:56 UTCEPSS rescore
  13. 2026-08-16 14:56 UTCEPSS rescore
  14. 2026-08-16 02:15 UTCEPSS rescore
  15. 2026-08-15 16:04 UTCEG score recompute
  16. 2026-08-15 16:04 UTCGHSA enrichment
  17. 2026-08-15 01:31 UTCEPSS rescore
  18. 2026-08-14 14:31 UTCEG score recompute
  19. 2026-08-14 14:31 UTCGHSA enrichment
  20. 2026-08-13 22:00 UTCEPSS rescore
  21. 2026-08-13 12:59 UTCEG score recompute
  22. 2026-08-13 12:59 UTCGHSA enrichment
  23. 2026-08-12 13:51 UTCEPSS rescore
  24. 2026-08-12 11:27 UTCEG score recompute
  25. 2026-08-12 11:27 UTCGHSA enrichment
  26. 2026-08-11 13:43 UTCEPSS rescore
  27. 2026-08-11 09:54 UTCEG score recompute
  28. 2026-08-11 09:54 UTCGHSA enrichment
  29. 2026-08-11 00:00 UTCEPSS rescore
  30. 2026-08-10 08:22 UTCEG score recompute
  31. 2026-08-10 08:22 UTCGHSA enrichment
  32. 2026-08-09 13:47 UTCEPSS rescore
  33. 2026-08-09 06:50 UTCEG score recompute
  34. 2026-08-09 06:50 UTCGHSA enrichment
  35. 2026-08-08 16:37 UTCEPSS rescore
  36. 2026-08-08 05:18 UTCEG score recompute
  37. 2026-08-08 05:18 UTCGHSA enrichment
  38. 2026-08-07 03:46 UTCEG score recompute
  39. 2026-08-07 03:46 UTCGHSA enrichment
  40. 2026-08-06 13:47 UTCEPSS rescore
  41. 2026-08-06 02:14 UTCEG score recompute
  42. 2026-08-06 02:14 UTCGHSA enrichment
  43. 2026-08-05 19:17 UTCEPSS rescore
  44. 2026-08-05 19:17 UTCEPSS rescore
  45. 2026-08-05 00:43 UTCEG score recompute
  46. 2026-08-05 00:42 UTCGHSA enrichment
  47. 2026-08-04 15:10 UTCEPSS rescore
  48. 2026-08-04 10:39 UTCEPSS rescore
  49. 2026-08-03 23:10 UTCEG score recompute
  50. 2026-08-03 23:10 UTCGHSA enrichment
  51. 2026-08-03 10:36 UTCEPSS rescore
  52. 2026-08-02 21:38 UTCEG score recompute
  53. 2026-08-02 21:38 UTCGHSA enrichment
  54. 2026-08-02 02:27 UTCEPSS rescore
  55. 2026-08-01 20:06 UTCEG score recompute
  56. 2026-08-01 20:06 UTCGHSA enrichment
  57. 2026-08-01 04:16 UTCEPSS rescore
  58. 2026-07-31 18:33 UTCGHSA enrichment
  59. 2026-07-30 16:58 UTCEG score recompute
  60. 2026-07-30 16:58 UTCGHSA enrichment
  61. 2026-07-30 16:28 UTCEPSS rescore
  62. 2026-07-30 01:30 UTCEPSS rescore
  63. 2026-07-29 15:24 UTCGHSA enrichment
  64. 2026-07-28 16:21 UTCEG score recompute
  65. 2026-07-28 16:21 UTCGHSA enrichment
  66. 2026-07-28 15:36 UTCEG score recompute
  67. 2026-07-28 15:36 UTCGHSA enrichment
  68. 2026-07-28 14:38 UTCEG score recompute
  69. 2026-07-28 14:38 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-7521?
CVE-2026-7521 is a medium vulnerability published on July 28, 2026. Mattermost versions 11.8.x <= 11.8.0, 11.7.x <= 11.7.3, 11.6.x <= 11.6.5, 10.11.x <= 10.11.20 fail to verify file deletion path which allows an admin with SAML system-console write permissions to delete arbitrary files outside the config directory from the server via the remove file endpoint..…
When was CVE-2026-7521 disclosed?
CVE-2026-7521 was first published in the National Vulnerability Database on July 28, 2026, with the most recent update on July 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-7521 actively exploited?
CVE-2026-7521 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 79.6% of all scored CVEs.
What is the CVSS score of CVE-2026-7521?
CVE-2026-7521 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-7521?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-7521, 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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