CVE-2026-50766

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreMEDIUM confidence

Score 5.4 from GitHub Security Advisory published 2026-06-27. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 5.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this weekElevated
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.4Exploit: Elevated riskExposed: 0

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

A stored cross-site scripting (XSS) vulnerability in the OPAC item detail page of Koha Library Management System 0 through 25.11 versions allow an authenticated remote attacker with edit_items permission to inject arbitrary web scripts via the item public notes field (items.itemnotes).

CVSS v3
5.4
EG Score
5.4(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity54% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
20%
KEV
Not listed

Published

June 26, 2026

Last Modified

July 5, 2026

Advisory Details (2)

Auto-updated Jun 29, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

CVE-2026-50766 | Ignas

https://lgnas.gitbook.io/findings/cve-2026-50766
generic

Kalamazoo Optimist Hockey Association

http://koha.com

Vendor Advisories for CVE-2026-50766(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 7× in last 7d / 50× 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 152 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-50766?
CVE-2026-50766 is a medium vulnerability published on June 26, 2026. A stored cross-site scripting (XSS) vulnerability in the OPAC item detail page of Koha Library Management System 0 through 25.11 versions allow an authenticated remote attacker with edit_items permission to inject arbitrary web scripts via the item public notes field (items.itemnotes).
When was CVE-2026-50766 disclosed?
CVE-2026-50766 was first published in the National Vulnerability Database on June 26, 2026, with the most recent update on July 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-50766 actively exploited?
CVE-2026-50766 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 80.0% of all scored CVEs.
What is the CVSS score of CVE-2026-50766?
CVE-2026-50766 has a CVSS v3.1 base score of 5.4 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-50766?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-50766, 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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