CVE-2026-1856

MEDIUMPre-NVD 6.46.4—
EchelonGraph scoreHIGH confidence

Score 6.4 from GitHub Security Advisory published 2026-06-19. a secondary CVSS source baseline 6.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
6.4
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.4Exploit: NoneExposed: 0

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

The Appointment Booking Calendar plugin for WordPress is vulnerable to Stored Cross-Site Scripting via custom booking field labels in all versions up to, and including, 1.4.4 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Author-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

CVSS v3
6.4
EG Score
6.4(high)
EPSS
9.2%
KEV
Not listed

Published

June 19, 2026

Last Modified

June 22, 2026

References (4)

Vendor Advisories for CVE-2026-1856(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 / 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.

  1. 2026-07-06 22:02 UTCEG score recompute
  2. 2026-07-06 22:02 UTCGHSA enrichment
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 02:23 UTCEPSS rescore
  5. 2026-07-05 19:36 UTCEG score recompute
  6. 2026-07-05 19:36 UTCGHSA enrichment
  7. 2026-07-05 02:30 UTCEPSS rescore
  8. 2026-07-05 02:30 UTCEPSS rescore
  9. 2026-07-04 17:11 UTCEG score recompute
  10. 2026-07-04 17:11 UTCGHSA enrichment
  11. 2026-07-04 06:31 UTCEPSS rescore
  12. 2026-07-03 14:45 UTCEG score recompute
  13. 2026-07-03 14:45 UTCGHSA enrichment
  14. 2026-07-02 12:20 UTCEG score recompute
  15. 2026-07-02 12:20 UTCGHSA enrichment
  16. 2026-07-01 15:06 UTCEPSS rescore
  17. 2026-07-01 15:06 UTCEPSS rescore
  18. 2026-07-01 09:56 UTCEG score recompute
  19. 2026-07-01 09:56 UTCGHSA enrichment
  20. 2026-06-30 23:22 UTCEPSS rescore
  21. 2026-06-30 07:31 UTCEG score recompute
  22. 2026-06-30 07:31 UTCGHSA enrichment
  23. 2026-06-29 14:06 UTCEPSS rescore
  24. 2026-06-29 05:05 UTCEG score recompute
  25. 2026-06-29 05:05 UTCGHSA enrichment
Show 25 more
  1. 2026-06-28 14:07 UTCEPSS rescore
  2. 2026-06-28 04:56 UTCEPSS rescore
  3. 2026-06-28 04:56 UTCEPSS rescore
  4. 2026-06-28 02:38 UTCEG score recompute
  5. 2026-06-28 02:38 UTCGHSA enrichment
  6. 2026-06-27 03:08 UTCEPSS rescore
  7. 2026-06-27 00:14 UTCEG score recompute
  8. 2026-06-27 00:13 UTCGHSA enrichment
  9. 2026-06-25 21:49 UTCEG score recompute
  10. 2026-06-25 21:49 UTCGHSA enrichment
  11. 2026-06-25 13:49 UTCEPSS rescore
  12. 2026-06-24 19:25 UTCEG score recompute
  13. 2026-06-24 19:24 UTCGHSA enrichment
  14. 2026-06-24 14:05 UTCEPSS rescore
  15. 2026-06-23 21:32 UTCEPSS rescore
  16. 2026-06-23 16:45 UTCEG score recompute
  17. 2026-06-23 16:45 UTCGHSA enrichment
  18. 2026-06-22 14:17 UTCEG score recompute
  19. 2026-06-22 14:16 UTCGHSA enrichment
  20. 2026-06-21 11:49 UTCEG score recompute
  21. 2026-06-21 11:49 UTCGHSA enrichment
  22. 2026-06-20 09:21 UTCEG score recompute
  23. 2026-06-20 09:21 UTCGHSA enrichment
  24. 2026-06-19 06:56 UTCEG score recompute
  25. 2026-06-19 06:55 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-1856?
CVE-2026-1856 is a medium vulnerability published on June 19, 2026. The Appointment Booking Calendar plugin for WordPress is vulnerable to Stored Cross-Site Scripting via custom booking field labels in all versions up to, and including, 1.4.4 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with…
When was CVE-2026-1856 disclosed?
CVE-2026-1856 was first published in the National Vulnerability Database on June 19, 2026, with the most recent update on June 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-1856 actively exploited?
CVE-2026-1856 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 9.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-1856?
CVE-2026-1856 has a CVSS v3 base score of 6.4 (NVD).
How do I remediate CVE-2026-1856?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-1856, 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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