CVE-2025-39663

HIGHNVD 8.48.4—
EchelonGraph scoreMEDIUM confidence

Score 8.4 from GitHub Security Advisory (severity: HIGH) published 2025-10-30. NVD baseline CVSS 8.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
8.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.4Exploit: Elevated riskExposed: 0

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

Cross-Site Scripting (XSS) vulnerability in Checkmk's distributed monitoring allows a compromised remote site to inject malicious HTML code into service outputs in the central site. Affecting Checkmk before 2.4.0p14, 2.3.0p39, 2.2.0 and 2.1.0 (eol).

CVSS v3
8.4
EG Score
8.4(medium)
EG Risk
54(Track*)
EG Risk 54/100SSVC: 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
Severity84% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
1%
EPSS %ILE
46%
KEV
Not listed

Published

October 30, 2025

Last Modified

December 3, 2025

Advisory Details (3)

Auto-updated Sep 2, 2026
🔬 Proof of concept available. Patch available.
generic Patch Available🟡 PoC Available

advisories/2025/SBA-ADV-20250729-01_Checkmk_Cross_Site_Scripting at 82fd27e4570433464c30b35150b197db9a850f4e · sbaresearch/advisories · GitHub

https://github.com/sbaresearch/advisories/tree/82fd27e4570433464c30b35150b197db9a850f4e/2025/SBA-ADV-20250729-01_Checkmk_Cross_Site_Scripting
generic Patch Available🟡 PoC Available

Full Disclosure: [SBA-ADV-20250729-01] CVE-2025-39663: Checkmk Cross Site Scripting

http://seclists.org/fulldisclosure/2025/Nov/0
generic

Werk #17998: Add option to configure trust between central and remote site

https://checkmk.com/werk/17998

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 5× in last 7d / 27× 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 143 total refreshes for this CVE.

  1. 2026-09-18 19:27 UTCEPSS rescore
  2. 2026-09-17 19:29 UTCEPSS rescore
  3. 2026-09-16 14:07 UTCEPSS rescore
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  6. 2026-09-12 18:36 UTCOSV refresh
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  24. 2026-08-24 23:53 UTCOSV refresh
  25. 2026-08-23 00:18 UTCEPSS rescore
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  1. 2026-08-21 23:48 UTCEPSS rescore
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  5. 2026-08-18 13:47 UTCEPSS rescore
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  10. 2026-08-13 21:59 UTCEPSS rescore
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  12. 2026-08-09 13:46 UTCEPSS rescore
  13. 2026-08-08 17:25 UTCOSV refresh
  14. 2026-08-08 16:36 UTCEPSS rescore
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  22. 2026-07-30 16:27 UTCEPSS rescore
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  24. 2026-07-28 15:35 UTCEPSS rescore
  25. 2026-07-26 14:54 UTCEPSS rescore
  26. 2026-07-25 14:17 UTCEPSS rescore
  27. 2026-07-25 14:17 UTCEPSS rescore
  28. 2026-07-24 14:17 UTCEPSS rescore
  29. 2026-07-23 16:11 UTCOSV refresh
  30. 2026-07-23 02:55 UTCEG score recompute
  31. 2026-07-22 14:07 UTCEPSS rescore
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  41. 2026-07-16 17:02 UTCEPSS rescore
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  44. 2026-07-15 01:59 UTCEPSS rescore
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  46. 2026-07-13 22:29 UTCEPSS rescore
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  48. 2026-07-13 06:12 UTCEPSS rescore
  49. 2026-07-12 05:46 UTCEPSS rescore
  50. 2026-07-11 08:27 UTCEPSS rescore
  51. 2026-07-11 08:27 UTCEPSS rescore
  52. 2026-07-09 19:09 UTCEPSS rescore
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  54. 2026-07-07 13:45 UTCEPSS rescore
  55. 2026-07-06 16:27 UTCEPSS rescore
  56. 2026-07-06 16:27 UTCEPSS rescore
  57. 2026-07-06 11:11 UTCOSV refresh
  58. 2026-07-06 02:23 UTCEPSS rescore
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  63. 2026-06-30 23:22 UTCEPSS rescore
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  69. 2026-06-28 04:55 UTCEPSS rescore
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  71. 2026-06-27 03:08 UTCEPSS rescore
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  73. 2026-06-25 13:49 UTCEPSS rescore
  74. 2026-06-25 13:49 UTCEPSS rescore
  75. 2026-06-24 14:04 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2025-39663?
CVE-2025-39663 is a high vulnerability published on October 30, 2025. Cross-Site Scripting (XSS) vulnerability in Checkmk's distributed monitoring allows a compromised remote site to inject malicious HTML code into service outputs in the central site. Affecting Checkmk before 2.4.0p14, 2.3.0p39, 2.2.0 and 2.1.0 (eol).
When was CVE-2025-39663 disclosed?
CVE-2025-39663 was first published in the National Vulnerability Database on October 30, 2025, with the most recent update on December 3, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-39663 actively exploited?
CVE-2025-39663 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 54.4% of all scored CVEs.
What is the CVSS score of CVE-2025-39663?
CVE-2025-39663 has a CVSS v3 base score of 8.4 (NVD).
How do I remediate CVE-2025-39663?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-39663, 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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