CVE-2026-20253

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score elevated to 9.8 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2026-06-18), indicating real-world exploitation has been confirmed by US federal agencies. a secondary CVSS source baseline 9.8 retained for reference (NVD's own analysis pending). Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, secondary
Trending — 4 sources updated this weekExploited in the wild
9.8
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 88%CVSS: 9.8Exploit: NoneExposed: 0

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

In Splunk Enterprise 10.2 versions below 10.2.4 and 10 versions below 10.0.7, an unauthenticated user could create or truncate arbitrary files through a PostgreSQL sidecar service endpoint. The vulnerability exists because the PostgreSQL sidecar service endpoint lacks authentication controls, allowing any network-reachable user to invoke file operations without credentials. Splunk Enterprise versions 9.4 and earlier are not affected. If you cannot immediately upgrade to a fixed version, you can mitigate this vulnerability by disabling the PostgreSQL sidecar service.

CVSS v3
9.8
EG Score
9.8(high)
EPSS
99.7%
KEV
⚠ Exploited

Published

June 10, 2026

Last Modified

June 19, 2026

Advisory Details (3)

Auto-updated Jun 29, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20253
generic

Why Use App-Level Auth When Every Database Has Auth? (Splunk Enterprise CVE-2026-20253 Pre-Auth RCE)

https://labs.watchtowr.com/why-use-app-level-auth-when-every-database-has-auth-splunk-enterprise-cve-2026-20253-pre-auth-rce/
generic

SVD-2026-0603 | Splunk Vulnerability Disclosure

https://advisory.splunk.com/advisories/SVD-2026-0603

Vendor Advisories for CVE-2026-20253(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 92× in last 7d / 355× 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 355 total refreshes for this CVE.

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

Publicly available exploits

(3 references)

Working exploit code is in the public domain (2 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoC0xBlackash/CVE-2026-20253
    First seen Jun 13, 2026

    CVE-2026-20253

    Open source ↗
  • GitHub PoCwatchtowrlabs/watchTowr-vs-Splunk-CVE-2026-20253
    First seen Jun 12, 2026
    Open source ↗
  • Nucleihttp/cves/2026/CVE-2026-20253.yaml
    First seen Jan 1, 2026

    Splunk Enterprise & Cloud Platform - Unrestricted File Upload

    Open source ↗

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2026-20253?
CVE-2026-20253 is a critical vulnerability published on June 10, 2026. In Splunk Enterprise 10.2 versions below 10.2.4 and 10 versions below 10.0.7, an unauthenticated user could create or truncate arbitrary files through a PostgreSQL sidecar service endpoint. The vulnerability exists because the PostgreSQL sidecar service endpoint lacks authentication controls,…
When was CVE-2026-20253 disclosed?
CVE-2026-20253 was first published in the National Vulnerability Database on June 10, 2026, with the most recent update on June 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-20253 actively exploited?
Yes. CISA added CVE-2026-20253 to the Known Exploited Vulnerabilities catalog on June 18, 2026, affecting Splunk Enterprise. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2026-20253?
CVE-2026-20253 has a CVSS v3 base score of 9.8 (NVD).
Which products are affected by CVE-2026-20253?
CVE-2026-20253 affects Splunk Enterprise. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2026-20253?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-20253, 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

Explore the affected products and dependency analysis for CVE-2026-20253

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