CVE-2026-63523

MEDIUMNVD 6.16.5▲
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory published 2026-09-08. NVD baseline CVSS 6.1; sources differ by 0.4.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 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: 0.6%CVSS: 6.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Improper neutralization of input during web page generation ('cross-site scripting') in Skype for Business allows an unauthorized attacker to perform spoofing over a network.

CVSS v3
6.1
EG Score
6.5MEDIUMhigh confidence
EG Risk
29
EG Risk 29/100CISA SSVC

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%
Exploitation1% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.6%
EPSS %ILE
44th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 8, 2026

Last Modified

October 1, 2026

Advisory Details (1)

Auto-updated Sep 8, 2026
Patch available. Sources: microsoft.
microsoft Patch Available

Security Update Guide - Microsoft Security Response Center

Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-63523

Vendor Advisories for CVE-2026-63523(2)

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 31× in last 7d / 128× 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 128 total refreshes for this CVE.

  1. 2026-10-05 04:16 UTCEG score recompute
  2. 2026-10-05 04:16 UTCVendor advisory
  3. 2026-10-05 04:16 UTCGHSA enrichment
  4. 2026-10-04 23:22 UTCEPSS rescore
  5. 2026-10-04 02:26 UTCEG score recompute
  6. 2026-10-04 02:26 UTCVendor advisory
  7. 2026-10-04 02:26 UTCGHSA enrichment
  8. 2026-10-03 14:26 UTCEPSS rescore
  9. 2026-10-03 00:46 UTCEG score recompute
  10. 2026-10-03 00:46 UTCVendor advisory
  11. 2026-10-03 00:46 UTCGHSA enrichment
  12. 2026-10-02 17:56 UTCEPSS rescore
  13. 2026-10-01 23:08 UTCEG score recompute
  14. 2026-10-01 23:08 UTCVendor advisory
  15. 2026-10-01 23:07 UTCGHSA enrichment
  16. 2026-10-01 19:50 UTCEPSS rescore
  17. 2026-10-01 17:23 UTCVendor advisory
  18. 2026-10-01 17:23 UTCGHSA enrichment
  19. 2026-09-30 15:32 UTCEG score recompute
  20. 2026-09-30 15:32 UTCVendor advisory
  21. 2026-09-30 15:32 UTCGHSA enrichment
  22. 2026-09-30 15:03 UTCEPSS rescore
  23. 2026-09-29 22:28 UTCVendor advisory
  24. 2026-09-29 22:28 UTCGHSA enrichment
  25. 2026-09-29 20:34 UTCEG score recompute
Show 75 more
  1. 2026-09-29 20:34 UTCVendor advisory
  2. 2026-09-29 20:33 UTCGHSA enrichment
  3. 2026-09-29 03:08 UTCEG score recompute
  4. 2026-09-29 03:08 UTCVendor advisory
  5. 2026-09-29 03:08 UTCGHSA enrichment
  6. 2026-09-28 13:51 UTCEPSS rescore
  7. 2026-09-28 01:22 UTCEG score recompute
  8. 2026-09-28 01:22 UTCVendor advisory
  9. 2026-09-28 01:22 UTCGHSA enrichment
  10. 2026-09-26 23:43 UTCEG score recompute
  11. 2026-09-26 23:43 UTCVendor advisory
  12. 2026-09-26 23:43 UTCGHSA enrichment
  13. 2026-09-26 15:59 UTCEPSS rescore
  14. 2026-09-25 21:47 UTCVendor advisory
  15. 2026-09-25 21:47 UTCGHSA enrichment
  16. 2026-09-24 22:27 UTCVendor advisory
  17. 2026-09-24 22:27 UTCGHSA enrichment
  18. 2026-09-24 20:37 UTCVendor advisory
  19. 2026-09-24 20:37 UTCGHSA enrichment
  20. 2026-09-24 17:19 UTCEG score recompute
  21. 2026-09-24 17:19 UTCVendor advisory
  22. 2026-09-24 17:19 UTCGHSA enrichment
  23. 2026-09-23 22:39 UTCVendor advisory
  24. 2026-09-23 22:39 UTCGHSA enrichment
  25. 2026-09-23 18:29 UTCEG score recompute
  26. 2026-09-23 18:29 UTCVendor advisory
  27. 2026-09-23 18:29 UTCGHSA enrichment
  28. 2026-09-23 17:54 UTCEPSS rescore
  29. 2026-09-22 18:05 UTCEG score recompute
  30. 2026-09-22 18:05 UTCVendor advisory
  31. 2026-09-22 18:05 UTCGHSA enrichment
  32. 2026-09-21 16:27 UTCVendor advisory
  33. 2026-09-21 16:27 UTCGHSA enrichment
  34. 2026-09-21 00:03 UTCEG score recompute
  35. 2026-09-21 00:03 UTCVendor advisory
  36. 2026-09-21 00:03 UTCGHSA enrichment
  37. 2026-09-20 20:16 UTCEPSS rescore
  38. 2026-09-19 22:24 UTCEG score recompute
  39. 2026-09-19 22:24 UTCVendor advisory
  40. 2026-09-19 22:24 UTCGHSA enrichment
  41. 2026-09-18 20:46 UTCEG score recompute
  42. 2026-09-18 20:46 UTCVendor advisory
  43. 2026-09-18 20:46 UTCGHSA enrichment
  44. 2026-09-18 19:28 UTCEPSS rescore
  45. 2026-09-18 13:50 UTCVendor advisory
  46. 2026-09-18 13:50 UTCGHSA enrichment
  47. 2026-09-17 23:05 UTCVendor advisory
  48. 2026-09-17 23:05 UTCGHSA enrichment
  49. 2026-09-17 19:54 UTCEG score recompute
  50. 2026-09-17 19:54 UTCVendor advisory
  51. 2026-09-17 19:54 UTCGHSA enrichment
  52. 2026-09-16 22:00 UTCVendor advisory
  53. 2026-09-16 22:00 UTCGHSA enrichment
  54. 2026-09-16 19:37 UTCEG score recompute
  55. 2026-09-16 19:37 UTCVendor advisory
  56. 2026-09-16 19:37 UTCGHSA enrichment
  57. 2026-09-16 19:31 UTCNVD updateCVSS v3 → 6.1
  58. 2026-09-16 14:08 UTCEPSS rescore
  59. 2026-09-16 05:15 UTCEPSS rescore
  60. 2026-09-15 22:46 UTCVendor advisory
  61. 2026-09-15 22:46 UTCGHSA enrichment
  62. 2026-09-15 17:40 UTCEG score recompute
  63. 2026-09-15 17:40 UTCVendor advisory
  64. 2026-09-15 17:40 UTCGHSA enrichment
  65. 2026-09-14 22:55 UTCVendor advisory
  66. 2026-09-14 22:55 UTCGHSA enrichment
  67. 2026-09-14 17:21 UTCVendor advisory
  68. 2026-09-14 17:21 UTCGHSA enrichment
  69. 2026-09-14 01:45 UTCEG score recompute
  70. 2026-09-14 01:45 UTCVendor advisory
  71. 2026-09-14 01:45 UTCGHSA enrichment
  72. 2026-09-13 00:06 UTCEG score recompute
  73. 2026-09-13 00:06 UTCVendor advisory
  74. 2026-09-13 00:06 UTCGHSA enrichment
  75. 2026-09-11 22:27 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-63523?
CVE-2026-63523 is a medium vulnerability published on September 8, 2026. Improper neutralization of input during web page generation ('cross-site scripting') in Skype for Business allows an unauthorized attacker to perform spoofing over a network.
When was CVE-2026-63523 disclosed?
CVE-2026-63523 was first published on September 8, 2026, with the most recent update on October 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-63523 actively exploited?
CVE-2026-63523 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (44th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-63523?
CVE-2026-63523 has a CVSS v3 base score of 6.1 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 6.5 (MEDIUM).
How do I remediate CVE-2026-63523?
A fix for CVE-2026-63523 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-63523 are linked in the Vendor Advisories panel on this page.

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