CVE-2026-9699

MEDIUMPre-NVD 6.86.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 6.8 from GitHub Security Advisory published 2026-06-26. A secondary CVSS source baseline 6.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
6.8EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 6.8Exploit: None knownExposed services: Not assessed

Update Mattermost Plugins to versions 11.7.0, 10.11.19, 11.6.4, 11.5.7 or higher (from the CVE record's solution, Mattermost, Inc.) — apply it.

Mattermost Plugins versions <=11.6 10.18.11 11.3.6 11.6.5.0 fail to sanitize error responses from the OpenAI API before logging, which allows a user with access to server logs or support packets to obtain a valid or partially reconstructable OpenAI API key via inspection of mattermost.log entries generated during authentication failures. Mattermost Advisory ID: MMSA-2026-00609

CVSS v3
6.8
EG Score
6.8MEDIUMmedium confidence
EG Risk
31
EG Risk 31/100

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 (value × EchelonGraph’s weight)
Severity68% × 45%
The EG Score, 6.8 of 10.
Exploitation0.5% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's BOD 26-04 default: no one has published Automatable for this CVE, and CISA treats it as “no” for a CVE not in KEV.
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (no CISA value, KEV listing or exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: Update Mattermost Plugins to versions 11.7.0, 10.11.19, 11.6.4, 11.5.7 or higher (from the CVE record's solution, Mattermost, Inc.). Apply it within your standard update timelines.
EPSS PROB
0.5%
EPSS %ILE
38th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

Update Mattermost Plugins to versions 11.7.0, 10.11.19, 11.6.4, 11.5.7 or higher (from the CVE record's solution, Mattermost, Inc.). Apply it within your standard update timelines.

Exploitation none (no CISA value, KEV listing or exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). Where an input reads “CISA's BOD 26-04 default”, no one has published it for this CVE, and CISA's implementation guidance says: “If “Automatable” and “Technical Impact” information items about a CVE ID are not available and the CVE ID is not in the KEV Catalog, CISA will treat its values as “no” and “total,” respectively, until CISA or a third party provides metadata about the CVE ID. CISA will always provide the Vulnrichment data for a CVE ID listed in the KEV Catalog.” Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

June 26, 2026

Last Modified

June 26, 2026

Advisory Details (1)

Auto-updated Jun 26, 2026
Fix named in the CVE record's solution (Mattermost, Inc.).
Web page

Security Updates

https://mattermost.com/security-updates

Vendor Advisories for CVE-2026-9699(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 12× in last 7d / 37× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 99 of 202 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 1 repeat row among the latest 100 is merged into the row it repeats. The 103 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-14 16:34 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  2. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  3. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  4. 2026-10-12 14:40 UTCEG score recompute
  5. 2026-10-11 19:11 UTCEG score recompute
  6. 2026-10-11 16:26 UTCEG score recompute
  7. 2026-10-11 13:50 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  8. 2026-10-11 13:38 UTCEG score recompute
  9. 2026-10-10 20:01 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  10. 2026-10-09 20:08 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  11. 2026-10-08 17:14 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  12. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  13. 2026-10-06 15:19 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  14. 2026-10-05 17:44 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  15. 2026-10-04 23:23 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  16. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  17. 2026-10-02 17:57 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  18. 2026-10-01 19:51 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  19. 2026-09-30 15:04 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  20. 2026-09-29 15:24 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  21. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  22. 2026-09-27 13:49 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  23. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  24. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  25. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.5% · 39th percentile
Show 74 more
  1. 2026-09-23 07:52 UTCEG score recompute
  2. 2026-09-23 07:52 UTCGHSA enrichmentGHSA-gr4w-63r3-8h38 · GitHub CVSS 6.8
  3. 2026-09-22 16:01 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  4. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  5. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  6. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  7. 2026-09-18 07:13 UTCEG score recompute
  8. 2026-09-18 07:13 UTCGHSA enrichmentGHSA-gr4w-63r3-8h38 · GitHub CVSS 6.8
  9. 2026-09-17 19:32 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  10. 2026-09-16 14:09 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  11. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  12. 2026-09-15 03:12 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  13. 2026-09-13 16:48 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  14. 2026-09-13 13:26 UTCGHSA enrichmentGHSA-gr4w-63r3-8h38 · GitHub CVSS 6.8
  15. 2026-09-12 15:36 UTCEG score recompute
  16. 2026-09-12 15:35 UTCGHSA enrichmentGHSA-gr4w-63r3-8h38 · GitHub CVSS 6.8
  17. 2026-09-12 15:02 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  18. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  19. 2026-09-11 09:38 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  20. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  21. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  22. 2026-09-06 13:48 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  23. 2026-09-05 15:31 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  24. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  25. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  26. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  27. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  28. 2026-08-30 19:22 UTCEG score recompute
  29. 2026-08-30 19:22 UTCGHSA enrichmentGHSA-gr4w-63r3-8h38 · GitHub CVSS 6.8
  30. 2026-08-30 19:18 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  31. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  32. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  33. 2026-08-27 23:10 UTCEG score recompute
  34. 2026-08-27 23:10 UTCGHSA enrichmentGHSA-gr4w-63r3-8h38 · GitHub CVSS 6.8
  35. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  36. 2026-08-26 14:47 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  37. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  38. 2026-08-25 03:21 UTCEG score recompute
  39. 2026-08-25 03:21 UTCGHSA enrichmentGHSA-gr4w-63r3-8h38 · GitHub CVSS 6.8
  40. 2026-08-24 14:18 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  41. 2026-08-24 05:33 UTCGHSA enrichmentGHSA-gr4w-63r3-8h38 · GitHub CVSS 6.8
  42. 2026-08-23 07:40 UTCEG score recompute
  43. 2026-08-23 07:40 UTCGHSA enrichmentGHSA-gr4w-63r3-8h38 · GitHub CVSS 6.8
  44. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  45. 2026-08-22 09:34 UTCEG score recompute
  46. 2026-08-22 09:34 UTCGHSA enrichmentGHSA-gr4w-63r3-8h38 · GitHub CVSS 6.8
  47. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  48. 2026-08-21 04:58 UTCEG score recompute
  49. 2026-08-21 04:58 UTCGHSA enrichmentGHSA-gr4w-63r3-8h38 · GitHub CVSS 6.8
  50. 2026-08-20 22:56 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  51. 2026-08-20 06:53 UTCEG score recompute
  52. 2026-08-20 06:53 UTCGHSA enrichmentGHSA-gr4w-63r3-8h38 · GitHub CVSS 6.8
  53. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  54. 2026-08-18 23:58 UTCEG score recompute
  55. 2026-08-18 23:58 UTCGHSA enrichmentGHSA-gr4w-63r3-8h38 · GitHub CVSS 6.8
  56. 2026-08-18 13:49 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  57. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  58. 2026-08-17 12:49 UTCGHSA enrichmentGHSA-gr4w-63r3-8h38 · GitHub CVSS 6.8
  59. 2026-08-16 15:01 UTCEG score recompute
  60. 2026-08-16 15:01 UTCGHSA enrichmentGHSA-gr4w-63r3-8h38 · GitHub CVSS 6.8
  61. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  62. 2026-08-16 02:15 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  63. 2026-08-15 17:14 UTCEG score recompute
  64. 2026-08-15 17:14 UTCGHSA enrichmentGHSA-gr4w-63r3-8h38 · GitHub CVSS 6.8
  65. 2026-08-15 01:31 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  66. 2026-08-14 19:26 UTCEG score recompute
  67. 2026-08-14 19:26 UTCGHSA enrichmentGHSA-gr4w-63r3-8h38 · GitHub CVSS 6.8
  68. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  69. 2026-08-13 21:38 UTCGHSA enrichmentGHSA-gr4w-63r3-8h38 · GitHub CVSS 6.8
  70. 2026-08-12 23:50 UTCEG score recompute
  71. 2026-08-12 23:50 UTCGHSA enrichmentGHSA-gr4w-63r3-8h38 · GitHub CVSS 6.8
  72. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  73. 2026-08-12 02:03 UTCEG score recompute
  74. 2026-08-12 02:03 UTCGHSA enrichmentGHSA-gr4w-63r3-8h38 · GitHub CVSS 6.8

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Frequently asked(5)

What is CVE-2026-9699?
CVE-2026-9699 is a medium-severity vulnerability; its CVE record was published on June 26, 2026. Mattermost Plugins versions <=11.6 10.18.11 11.3.6 11.6.5.0 fail to sanitize error responses from the OpenAI API before logging, which allows a user with access to server logs or support packets to obtain a valid or partially reconstructable OpenAI API key via inspection of mattermost.log entries…
When was the CVE record for CVE-2026-9699 published?
The CVE record for CVE-2026-9699 was published on June 26, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of June 26, 2026; the record at its source may have been updated since.
Is CVE-2026-9699 actively exploited?
CVE-2026-9699 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (38th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-9699?
CVE-2026-9699 has a CVSS base score of 6.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-9699?
The CVE record's solution for CVE-2026-9699, written by its CNA Mattermost, Inc., names the fix: "Update Mattermost Plugins to versions 11.7.0, 10.11.19, 11.6.4, 11.5.7 or higher." The vendor advisories EchelonGraph has for CVE-2026-9699 are linked in the Vendor Advisories panel on this page.

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