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
9.8EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 97%CVSS: 9.8Exploit: cisa kev · epss top5pct · epss high · public exploitExposed: 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)
EG Risk
99(Act)
EG Risk 99/100SSVC: Act

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
Severity98% × 45%
Exploitation100% × 40%
Automatability100% × 15%
Action: Fix now — active exploitation, automatable, high impact.
EPSS PROB
97%
EPSS %ILE
100%
KEV
⚠ Exploited

Published

June 10, 2026

Last Modified

July 23, 2026

Advisory Details (3)

Auto-updated Sep 12, 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 50× in last 7d / 220× 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 690 total refreshes for this CVE.

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

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 ↗

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 July 23, 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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