CVE-2026-9820

LOWPre-NVD 3.83.8—
EchelonGraph scoreMEDIUM confidence

Score 3.8 from GitHub Security Advisory (severity: LOW) published 2026-07-13. a secondary CVSS source baseline 3.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
3.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 3.8Exploit: 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, 10.11.x <= 10.11.19 fail to sanitize team objects returned by the scheme teams endpoint, which allows a user with the User Manager role to obtain invite links for private teams and use them to join or share access to those teams via the scheme teams API endpoint.. Mattermost Advisory ID: MMSA-2026-00671

CVSS v3
3.8
EG Score
3.8(medium)
EG Risk
17(Track)
EG Risk 17/100SSVC: 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
Severity38% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
17%
KEV
Not listed

Published

July 13, 2026

Last Modified

July 13, 2026

References (1)

Vendor Advisories for CVE-2026-9820(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 / 49× 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 05:29 UTCEG score recompute
  2. 2026-08-30 05:29 UTCGHSA enrichment
  3. 2026-08-30 01:22 UTCEPSS rescore
  4. 2026-08-28 21:42 UTCEPSS rescore
  5. 2026-08-27 14:25 UTCEPSS rescore
  6. 2026-08-26 14:47 UTCEPSS rescore
  7. 2026-08-26 07:58 UTCEG score recompute
  8. 2026-08-26 07:58 UTCGHSA enrichment
  9. 2026-08-25 13:49 UTCEPSS rescore
  10. 2026-08-24 14:18 UTCEPSS rescore
  11. 2026-08-23 05:50 UTCEG score recompute
  12. 2026-08-23 05:49 UTCGHSA enrichment
  13. 2026-08-23 00:19 UTCEPSS rescore
  14. 2026-08-21 23:49 UTCEPSS rescore
  15. 2026-08-20 22:56 UTCEPSS rescore
  16. 2026-08-20 03:54 UTCEG score recompute
  17. 2026-08-20 03:54 UTCGHSA enrichment
  18. 2026-08-19 17:04 UTCEPSS rescore
  19. 2026-08-18 13:49 UTCEPSS rescore
  20. 2026-08-17 13:47 UTCEPSS rescore
  21. 2026-08-17 01:51 UTCEG score recompute
  22. 2026-08-17 01:51 UTCGHSA enrichment
  23. 2026-08-16 14:56 UTCEPSS rescore
  24. 2026-08-16 02:15 UTCEPSS rescore
  25. 2026-08-15 01:31 UTCEPSS rescore
Show 49 more
  1. 2026-08-13 23:56 UTCEG score recompute
  2. 2026-08-13 23:56 UTCGHSA enrichment
  3. 2026-08-13 22:00 UTCEPSS rescore
  4. 2026-08-12 13:51 UTCEPSS rescore
  5. 2026-08-11 13:43 UTCEPSS rescore
  6. 2026-08-11 00:00 UTCEPSS rescore
  7. 2026-08-10 22:01 UTCEG score recompute
  8. 2026-08-10 22:01 UTCGHSA enrichment
  9. 2026-08-09 13:47 UTCEPSS rescore
  10. 2026-08-08 16:37 UTCEPSS rescore
  11. 2026-08-07 20:06 UTCEG score recompute
  12. 2026-08-07 20:06 UTCGHSA enrichment
  13. 2026-08-07 16:30 UTCEPSS rescore
  14. 2026-08-06 13:47 UTCEPSS rescore
  15. 2026-08-05 19:17 UTCEPSS rescore
  16. 2026-08-04 18:11 UTCEG score recompute
  17. 2026-08-04 18:11 UTCGHSA enrichment
  18. 2026-08-04 15:10 UTCEPSS rescore
  19. 2026-08-04 10:39 UTCEPSS rescore
  20. 2026-08-03 10:36 UTCEPSS rescore
  21. 2026-08-02 02:27 UTCEPSS rescore
  22. 2026-08-01 15:45 UTCEG score recompute
  23. 2026-08-01 15:45 UTCGHSA enrichment
  24. 2026-08-01 04:16 UTCEPSS rescore
  25. 2026-07-30 16:28 UTCEPSS rescore
  26. 2026-07-30 01:30 UTCEPSS rescore
  27. 2026-07-29 13:49 UTCEG score recompute
  28. 2026-07-29 13:49 UTCGHSA enrichment
  29. 2026-07-28 15:37 UTCEPSS rescore
  30. 2026-07-27 14:14 UTCEPSS rescore
  31. 2026-07-26 14:54 UTCEPSS rescore
  32. 2026-07-26 11:53 UTCEG score recompute
  33. 2026-07-26 11:53 UTCGHSA enrichment
  34. 2026-07-25 14:18 UTCEPSS rescore
  35. 2026-07-24 14:18 UTCEPSS rescore
  36. 2026-07-23 14:18 UTCEPSS rescore
  37. 2026-07-23 03:23 UTCEG score recompute
  38. 2026-07-22 14:08 UTCEPSS rescore
  39. 2026-07-21 15:25 UTCEPSS rescore
  40. 2026-07-20 17:08 UTCEPSS rescore
  41. 2026-07-19 14:31 UTCEPSS rescore
  42. 2026-07-19 02:29 UTCEPSS rescore
  43. 2026-07-18 10:04 UTCEPSS rescore
  44. 2026-07-16 17:03 UTCEPSS rescore
  45. 2026-07-16 12:53 UTCGHSA enrichment
  46. 2026-07-15 16:57 UTCEPSS rescore
  47. 2026-07-15 02:00 UTCEPSS rescore
  48. 2026-07-13 10:58 UTCEG score recompute
  49. 2026-07-13 10:57 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-9820?
CVE-2026-9820 is a low vulnerability published on July 13, 2026. Mattermost versions 11.7.x <= 11.7.2, 10.11.x <= 10.11.19 fail to sanitize team objects returned by the scheme teams endpoint, which allows a user with the User Manager role to obtain invite links for private teams and use them to join or share access to those teams via the scheme teams API…
When was CVE-2026-9820 disclosed?
CVE-2026-9820 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-2026-9820 actively exploited?
CVE-2026-9820 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 83.2% of all scored CVEs.
What is the CVSS score of CVE-2026-9820?
CVE-2026-9820 has a CVSS v3 base score of 3.8 (NVD).
How do I remediate CVE-2026-9820?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-9820, 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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