CVE-2026-76258

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-08-20. a secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0

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

In Splunk Enterprise versions below 10.4.2, 10.2.6, 10.0.9, and 9.4.14, and Splunk Secure Gateway versions below 3.10.10, 3.9.24, and 3.8.71, a user who does not hold the "admin" or "power" Splunk roles could register an arbitrary companion app and cause Splunk Secure Gateway to forward mobile user requests, including tokens that compromise all relevant data available to the affected mobile user, to an attacker-controlled Uniform Resource Locator (URL). The vulnerability is possible because a hard-coded cryptographic key in the Splunk Secure Gateway companion app registration handler allows for arbitrary callback URL registration without restriction. For more information see Define roles on the Splunk platform with capabilities (https://help.splunk.com/en/splunk-enterprise/administer/manage-users-and-security/10.2/manage-splunk-platform-users-and-roles/define-roles-on-the-splunk-platform-with-capabilities) in the Splunk documentation.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
16%
KEV
Not listed

Published

August 19, 2026

Last Modified

August 26, 2026

Advisory Details (1)

Auto-updated Aug 19, 2026
No patch confirmed yet.
generic

SVD-2026-0801 | Splunk Vulnerability Disclosure

https://advisory.splunk.com/advisories/SVD-2026-0801

Vendor Advisories for CVE-2026-76258(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 / 82× 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. 2026-09-19 16:33 UTCEG score recompute
  2. 2026-09-19 16:33 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 15:14 UTCEG score recompute
  5. 2026-09-18 15:14 UTCGHSA enrichment
  6. 2026-09-17 13:55 UTCEG score recompute
  7. 2026-09-17 13:55 UTCGHSA enrichment
  8. 2026-09-16 14:08 UTCEPSS rescore
  9. 2026-09-16 12:36 UTCEG score recompute
  10. 2026-09-16 12:36 UTCGHSA enrichment
  11. 2026-09-16 05:15 UTCEPSS rescore
  12. 2026-09-15 11:17 UTCEG score recompute
  13. 2026-09-15 11:17 UTCGHSA enrichment
  14. 2026-09-15 03:12 UTCEPSS rescore
  15. 2026-09-14 08:48 UTCEG score recompute
  16. 2026-09-14 08:48 UTCGHSA enrichment
  17. 2026-09-13 07:30 UTCEG score recompute
  18. 2026-09-13 07:29 UTCGHSA enrichment
  19. 2026-09-12 15:02 UTCEPSS rescore
  20. 2026-09-12 06:11 UTCEG score recompute
  21. 2026-09-12 06:10 UTCGHSA enrichment
  22. 2026-09-11 14:53 UTCEPSS rescore
  23. 2026-09-11 04:50 UTCEG score recompute
  24. 2026-09-11 04:50 UTCGHSA enrichment
  25. 2026-09-10 09:35 UTCEPSS rescore
Show 63 more
  1. 2026-09-10 03:31 UTCGHSA enrichment
  2. 2026-09-09 02:13 UTCEG score recompute
  3. 2026-09-09 02:12 UTCGHSA enrichment
  4. 2026-09-08 22:01 UTCEPSS rescore
  5. 2026-09-07 15:37 UTCEG score recompute
  6. 2026-09-07 15:37 UTCGHSA enrichment
  7. 2026-09-06 13:48 UTCEPSS rescore
  8. 2026-09-06 12:38 UTCEG score recompute
  9. 2026-09-06 12:38 UTCGHSA enrichment
  10. 2026-09-05 11:19 UTCEG score recompute
  11. 2026-09-05 11:18 UTCGHSA enrichment
  12. 2026-09-04 09:58 UTCEG score recompute
  13. 2026-09-04 09:58 UTCGHSA enrichment
  14. 2026-09-04 05:07 UTCEPSS rescore
  15. 2026-09-03 08:38 UTCEG score recompute
  16. 2026-09-03 08:38 UTCGHSA enrichment
  17. 2026-09-02 14:12 UTCEPSS rescore
  18. 2026-09-02 07:18 UTCEG score recompute
  19. 2026-09-02 07:17 UTCGHSA enrichment
  20. 2026-09-01 13:54 UTCEPSS rescore
  21. 2026-09-01 05:58 UTCEG score recompute
  22. 2026-09-01 05:58 UTCGHSA enrichment
  23. 2026-09-01 04:40 UTCEPSS rescore
  24. 2026-09-01 04:40 UTCEPSS rescore
  25. 2026-08-31 04:22 UTCEG score recompute
  26. 2026-08-31 04:22 UTCGHSA enrichment
  27. 2026-08-30 19:18 UTCEPSS rescore
  28. 2026-08-30 19:17 UTCEPSS rescore
  29. 2026-08-30 03:03 UTCEG score recompute
  30. 2026-08-30 03:03 UTCGHSA enrichment
  31. 2026-08-30 01:22 UTCEPSS rescore
  32. 2026-08-29 01:44 UTCEG score recompute
  33. 2026-08-29 01:44 UTCGHSA enrichment
  34. 2026-08-28 21:42 UTCEPSS rescore
  35. 2026-08-27 18:42 UTCEG score recompute
  36. 2026-08-27 18:42 UTCGHSA enrichment
  37. 2026-08-27 14:25 UTCEPSS rescore
  38. 2026-08-26 16:52 UTCEG score recompute
  39. 2026-08-26 16:52 UTCGHSA enrichment
  40. 2026-08-26 16:00 UTCEG score recompute
  41. 2026-08-26 16:00 UTCGHSA enrichment
  42. 2026-08-26 14:47 UTCEPSS rescore
  43. 2026-08-25 21:43 UTCEG score recompute
  44. 2026-08-25 21:43 UTCGHSA enrichment
  45. 2026-08-25 13:49 UTCEPSS rescore
  46. 2026-08-24 20:24 UTCEG score recompute
  47. 2026-08-24 20:24 UTCGHSA enrichment
  48. 2026-08-24 14:18 UTCEPSS rescore
  49. 2026-08-23 19:05 UTCEG score recompute
  50. 2026-08-23 19:05 UTCGHSA enrichment
  51. 2026-08-23 00:19 UTCEPSS rescore
  52. 2026-08-22 17:47 UTCEG score recompute
  53. 2026-08-22 17:47 UTCGHSA enrichment
  54. 2026-08-21 23:49 UTCEPSS rescore
  55. 2026-08-21 16:28 UTCEG score recompute
  56. 2026-08-21 16:28 UTCGHSA enrichment
  57. 2026-08-20 22:56 UTCEPSS rescore
  58. 2026-08-20 15:07 UTCGHSA enrichment
  59. 2026-08-20 13:24 UTCEG score recompute
  60. 2026-08-20 13:24 UTCGHSA enrichment
  61. 2026-08-19 22:23 UTCEG score recompute
  62. 2026-08-19 21:40 UTCEG score recompute
  63. 2026-08-19 21:37 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-76258?
CVE-2026-76258 is a medium vulnerability published on August 19, 2026. In Splunk Enterprise versions below 10.4.2, 10.2.6, 10.0.9, and 9.4.14, and Splunk Secure Gateway versions below 3.10.10, 3.9.24, and 3.8.71, a user who does not hold the "admin" or "power" Splunk roles could register an arbitrary companion app and cause Splunk Secure Gateway to forward mobile user…
When was CVE-2026-76258 disclosed?
CVE-2026-76258 was first published in the National Vulnerability Database on August 19, 2026, with the most recent update on August 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-76258 actively exploited?
CVE-2026-76258 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 83.6% of all scored CVEs.
What is the CVSS score of CVE-2026-76258?
CVE-2026-76258 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-76258?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-76258, 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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