CVE-2026-50766

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreHIGH 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
5.4
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.4Exploit: NoneExposed: 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(high)
EPSS
9.5%
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 18× in last 7d / 28× 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 16:27 UTCEPSS rescore
  2. 2026-07-06 06:18 UTCEG score recompute
  3. 2026-07-06 06:18 UTCGHSA enrichment
  4. 2026-07-06 02:23 UTCEPSS rescore
  5. 2026-07-05 05:15 UTCEG score recompute
  6. 2026-07-05 05:15 UTCGHSA enrichment
  7. 2026-07-05 02:30 UTCEPSS rescore
  8. 2026-07-04 06:31 UTCEPSS rescore
  9. 2026-07-04 04:05 UTCEG score recompute
  10. 2026-07-04 04:04 UTCGHSA enrichment
  11. 2026-07-03 02:59 UTCEG score recompute
  12. 2026-07-03 02:59 UTCGHSA enrichment
  13. 2026-07-02 01:56 UTCEG score recompute
  14. 2026-07-02 01:56 UTCGHSA enrichment
  15. 2026-07-01 15:07 UTCEPSS rescore
  16. 2026-07-01 00:53 UTCEG score recompute
  17. 2026-07-01 00:53 UTCGHSA enrichment
  18. 2026-06-30 23:22 UTCEPSS rescore
  19. 2026-06-29 23:50 UTCEG score recompute▲ 5.40
  20. 2026-06-29 23:50 UTCGHSA enrichment
  21. 2026-06-29 14:06 UTCEPSS rescore
  22. 2026-06-29 14:06 UTCEPSS rescore
  23. 2026-06-29 13:32 UTCMITRE cvelistV5CVSS v3 → 5.4 · severity → MEDIUM
  24. 2026-06-28 14:07 UTCEPSS rescore
  25. 2026-06-28 04:56 UTCEPSS rescore
Show 3 more
  1. 2026-06-28 04:56 UTCEPSS rescore
  2. 2026-06-26 23:42 UTCEG score recompute
  3. 2026-06-26 23:42 UTCNVD updatefirst tracked

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 9.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
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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