CVE-2026-8378

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreHIGH confidence

Score 5.4 from GitHub Security Advisory published 2026-06-23. 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.

The Frontend File Manager Plugin WordPress plugin through 23.6 does not sanitise nor escape a filename submitted to the frontend file-rename endpoint before storing it as post meta and rendering it back on the admin File Manager listing, leading to a Stored Cross-Site Scripting vulnerability exploitable by users with Subscriber-level access and above against an administrator viewing the file management interface.

CVSS v3
5.4
EG Score
5.4(high)
EPSS
3.2%
KEV
Not listed

Published

June 23, 2026

Last Modified

June 23, 2026

Advisory Details (1)

Auto-updated Jun 23, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

Frontend File Manager Plugin <= 23.6 – Subscriber+ Stored Cross-Site Scripting via File Rename | CVE 2026-8378 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/19f5dd94-b16c-4ad2-9586-d15ddecf9805/

Vendor Advisories for CVE-2026-8378(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Data Freshness Timeline

(refreshed 24× in last 7d / 43× 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. 2026-07-07 01:32 UTCEG score recompute
  2. 2026-07-07 01:31 UTCGHSA enrichment
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 16:27 UTCEPSS rescore
  5. 2026-07-06 02:23 UTCEPSS rescore
  6. 2026-07-06 02:23 UTCEPSS rescore
  7. 2026-07-06 00:10 UTCEG score recompute
  8. 2026-07-06 00:10 UTCGHSA enrichment
  9. 2026-07-05 02:31 UTCEPSS rescore
  10. 2026-07-05 02:30 UTCEPSS rescore
  11. 2026-07-04 22:48 UTCEG score recompute
  12. 2026-07-04 22:48 UTCGHSA enrichment
  13. 2026-07-04 06:31 UTCEPSS rescore
  14. 2026-07-04 06:31 UTCEPSS rescore
  15. 2026-07-03 21:28 UTCEG score recompute
  16. 2026-07-03 21:28 UTCGHSA enrichment
  17. 2026-07-02 20:08 UTCEG score recompute
  18. 2026-07-02 20:08 UTCGHSA enrichment
  19. 2026-07-01 18:48 UTCEG score recompute
  20. 2026-07-01 18:48 UTCGHSA enrichment
  21. 2026-07-01 15:07 UTCEPSS rescore
  22. 2026-06-30 23:22 UTCEPSS rescore
  23. 2026-06-30 17:28 UTCEG score recompute
  24. 2026-06-30 17:28 UTCGHSA enrichment
  25. 2026-06-29 16:08 UTCEG score recompute
Show 18 more
  1. 2026-06-29 16:08 UTCGHSA enrichment
  2. 2026-06-29 14:06 UTCEPSS rescore
  3. 2026-06-28 14:48 UTCEG score recompute
  4. 2026-06-28 14:48 UTCGHSA enrichment
  5. 2026-06-28 14:07 UTCEPSS rescore
  6. 2026-06-28 04:56 UTCEPSS rescore
  7. 2026-06-27 13:28 UTCEG score recompute
  8. 2026-06-27 13:28 UTCGHSA enrichment
  9. 2026-06-27 03:08 UTCEPSS rescore
  10. 2026-06-26 12:07 UTCEG score recompute▲ 5.40
  11. 2026-06-26 12:07 UTCGHSA enrichment
  12. 2026-06-25 13:50 UTCEPSS rescore
  13. 2026-06-24 14:05 UTCEPSS rescore
  14. 2026-06-23 21:33 UTCEPSS rescore
  15. 2026-06-23 12:40 UTCMITRE cvelistV5CVSS v3 → 5.4 · severity → MEDIUM
  16. 2026-06-23 07:33 UTCNVD update
  17. 2026-06-23 06:41 UTCEG score recompute
  18. 2026-06-23 06:40 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-8378?
CVE-2026-8378 is a medium vulnerability published on June 23, 2026. The Frontend File Manager Plugin WordPress plugin through 23.6 does not sanitise nor escape a filename submitted to the frontend file-rename endpoint before storing it as post meta and rendering it back on the admin File Manager listing, leading to a Stored Cross-Site Scripting vulnerability…
When was CVE-2026-8378 disclosed?
CVE-2026-8378 was first published in the National Vulnerability Database on June 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8378 actively exploited?
CVE-2026-8378 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-8378?
CVE-2026-8378 has a CVSS v3.1 base score of 5.4 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-8378?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8378, 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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