CVE-2026-42663

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory published 2026-06-15. the CNA's CVSS baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:patchstack, epss, ghsa
Trending — 3 sources updated this week
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.5Exploit: NoneExposed: 0

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

Unauthenticated Cross Site Scripting (XSS) in Simple Membership <= 4.7.2 versions.

CVSS v3
6.5
EG Score
6.5(high)
EPSS
5.6%
KEV
Not listed

Published

June 15, 2026

Last Modified

June 16, 2026

References (1)

Vendor Advisories for CVE-2026-42663(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 20× in last 7d / 66× 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. 2026-07-06 23:59 UTCEG score recompute
  2. 2026-07-06 23:59 UTCGHSA enrichment
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 16:27 UTCEPSS rescore
  5. 2026-07-05 18:22 UTCEG score recompute
  6. 2026-07-05 18:22 UTCGHSA enrichment
  7. 2026-07-05 02:30 UTCEPSS rescore
  8. 2026-07-04 18:48 UTCEG score recompute
  9. 2026-07-04 18:48 UTCGHSA enrichment
  10. 2026-07-04 06:31 UTCEPSS rescore
  11. 2026-07-03 16:54 UTCEG score recompute
  12. 2026-07-03 16:54 UTCGHSA enrichment
  13. 2026-07-02 17:20 UTCEG score recompute
  14. 2026-07-02 17:20 UTCGHSA enrichment
  15. 2026-07-01 17:40 UTCEG score recompute
  16. 2026-07-01 17:40 UTCGHSA enrichment
  17. 2026-07-01 15:06 UTCEPSS rescore
  18. 2026-06-30 23:22 UTCEPSS rescore
  19. 2026-06-30 18:05 UTCEG score recompute
  20. 2026-06-30 18:05 UTCGHSA enrichment
  21. 2026-06-29 18:32 UTCEG score recompute
  22. 2026-06-29 18:31 UTCGHSA enrichment
  23. 2026-06-29 14:06 UTCEPSS rescore
  24. 2026-06-28 18:32 UTCEG score recompute
  25. 2026-06-28 18:32 UTCGHSA enrichment
Show 41 more
  1. 2026-06-28 14:07 UTCEPSS rescore
  2. 2026-06-28 04:56 UTCEPSS rescore
  3. 2026-06-27 18:59 UTCEG score recompute
  4. 2026-06-27 18:59 UTCGHSA enrichment
  5. 2026-06-27 03:08 UTCEPSS rescore
  6. 2026-06-26 19:26 UTCEG score recompute
  7. 2026-06-26 19:26 UTCGHSA enrichment
  8. 2026-06-25 19:54 UTCEG score recompute
  9. 2026-06-25 19:54 UTCGHSA enrichment
  10. 2026-06-25 13:49 UTCEPSS rescore
  11. 2026-06-25 13:49 UTCEPSS rescore
  12. 2026-06-24 20:20 UTCEG score recompute
  13. 2026-06-24 20:20 UTCGHSA enrichment
  14. 2026-06-24 14:05 UTCEPSS rescore
  15. 2026-06-23 21:33 UTCEPSS rescore
  16. 2026-06-23 18:59 UTCEG score recompute
  17. 2026-06-23 18:59 UTCGHSA enrichment
  18. 2026-06-22 19:26 UTCEG score recompute
  19. 2026-06-22 19:26 UTCGHSA enrichment
  20. 2026-06-21 19:51 UTCEG score recompute
  21. 2026-06-21 19:50 UTCGHSA enrichment
  22. 2026-06-21 14:56 UTCEPSS rescore
  23. 2026-06-21 14:56 UTCEPSS rescore
  24. 2026-06-21 01:59 UTCEPSS rescore
  25. 2026-06-20 20:15 UTCEG score recompute
  26. 2026-06-20 20:15 UTCGHSA enrichment
  27. 2026-06-19 20:04 UTCEG score recompute
  28. 2026-06-19 20:04 UTCGHSA enrichment
  29. 2026-06-19 19:25 UTCEPSS rescore
  30. 2026-06-18 20:30 UTCEG score recompute
  31. 2026-06-18 20:30 UTCGHSA enrichment
  32. 2026-06-18 17:52 UTCEPSS rescore
  33. 2026-06-18 17:52 UTCEPSS rescore
  34. 2026-06-17 20:54 UTCEG score recompute
  35. 2026-06-17 20:54 UTCGHSA enrichment
  36. 2026-06-17 17:53 UTCEPSS rescore
  37. 2026-06-16 21:21 UTCEG score recompute
  38. 2026-06-16 21:21 UTCGHSA enrichment
  39. 2026-06-16 17:52 UTCEPSS rescore
  40. 2026-06-15 21:49 UTCEG score recompute
  41. 2026-06-15 21:48 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-42663?
CVE-2026-42663 is a medium vulnerability published on June 15, 2026. Unauthenticated Cross Site Scripting (XSS) in Simple Membership <= 4.7.2 versions.
When was CVE-2026-42663 disclosed?
CVE-2026-42663 was first published in the National Vulnerability Database on June 15, 2026, with the most recent update on June 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42663 actively exploited?
CVE-2026-42663 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 5.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-42663?
CVE-2026-42663 has a CVSS v4.0 base score of 6.5 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-42663?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42663, 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-2026-42663

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