CVE-2026-15383

MEDIUMPre-NVD 6.16.1—
EchelonGraph scoreHIGH confidence

Score 6.1 from GitHub Security Advisory published 2026-08-03. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 6.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this weekElevated
6.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.1Exploit: Elevated riskExposed: 0

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

The Blog Floating Button WordPress plugin through 1.4.20 does not sanitize or escape the visitor User-Agent header, which it stores through an unauthenticated tracking REST endpoint and later renders unescaped in an administrator report page. This allows an unauthenticated attacker to store a malicious script that executes in the session of any administrator who views the access report, leading to site takeover.

CVSS v3
6.1
EG Score
6.1(high)
EG Risk
43(Track)
EG Risk 43/100SSVC: 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
Severity61% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
6%
KEV
Not listed

Published

August 3, 2026

Last Modified

August 3, 2026

Advisory Details (1)

Auto-updated Aug 3, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

Blog Floating Button <= 1.4.20 – Unauthenticated Stored XSS via User-Agent Header | CVE 2026-15383 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/45e5d74e-6f7b-499b-ae25-74fe1bc8d18d/

Vendor Advisories for CVE-2026-15383(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 21× in last 7d / 55× 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. 2026-08-20 02:43 UTCEG score recompute
  2. 2026-08-20 02:43 UTCGHSA enrichment
  3. 2026-08-19 17:03 UTCEPSS rescore
  4. 2026-08-19 04:52 UTCEG score recompute
  5. 2026-08-19 04:52 UTCGHSA enrichment
  6. 2026-08-18 13:48 UTCEPSS rescore
  7. 2026-08-18 07:05 UTCEG score recompute
  8. 2026-08-18 07:05 UTCGHSA enrichment
  9. 2026-08-17 13:47 UTCEPSS rescore
  10. 2026-08-17 09:15 UTCEG score recompute
  11. 2026-08-17 09:15 UTCGHSA enrichment
  12. 2026-08-16 14:56 UTCEPSS rescore
  13. 2026-08-16 11:28 UTCEG score recompute
  14. 2026-08-16 11:28 UTCGHSA enrichment
  15. 2026-08-16 02:14 UTCEPSS rescore
  16. 2026-08-15 13:42 UTCEG score recompute
  17. 2026-08-15 13:42 UTCGHSA enrichment
  18. 2026-08-15 01:30 UTCEPSS rescore
  19. 2026-08-14 15:55 UTCEG score recompute
  20. 2026-08-14 15:55 UTCGHSA enrichment
  21. 2026-08-13 22:00 UTCEPSS rescore
  22. 2026-08-13 18:08 UTCGHSA enrichment
  23. 2026-08-12 20:22 UTCEG score recompute
  24. 2026-08-12 20:22 UTCGHSA enrichment
  25. 2026-08-12 13:50 UTCEPSS rescore
Show 30 more
  1. 2026-08-11 22:35 UTCEG score recompute
  2. 2026-08-11 22:35 UTCGHSA enrichment
  3. 2026-08-11 13:42 UTCEPSS rescore
  4. 2026-08-11 00:49 UTCEG score recompute
  5. 2026-08-11 00:49 UTCGHSA enrichment
  6. 2026-08-11 00:00 UTCEPSS rescore
  7. 2026-08-10 03:02 UTCGHSA enrichment
  8. 2026-08-09 05:16 UTCEG score recompute
  9. 2026-08-09 05:16 UTCGHSA enrichment
  10. 2026-08-08 16:37 UTCEPSS rescore
  11. 2026-08-08 07:30 UTCEG score recompute
  12. 2026-08-08 07:30 UTCGHSA enrichment
  13. 2026-08-07 09:43 UTCEG score recompute
  14. 2026-08-07 09:43 UTCGHSA enrichment
  15. 2026-08-06 13:46 UTCEPSS rescore
  16. 2026-08-06 11:56 UTCEG score recompute
  17. 2026-08-06 11:56 UTCGHSA enrichment
  18. 2026-08-05 19:17 UTCEPSS rescore
  19. 2026-08-05 14:10 UTCGHSA enrichment
  20. 2026-08-04 16:04 UTCEG score recompute
  21. 2026-08-04 16:04 UTCGHSA enrichment
  22. 2026-08-04 15:10 UTCEPSS rescore
  23. 2026-08-04 10:38 UTCEPSS rescore
  24. 2026-08-03 18:17 UTCGHSA enrichment
  25. 2026-08-03 17:55 UTCEG score recompute▲ 6.10
  26. 2026-08-03 17:54 UTCGHSA enrichment
  27. 2026-08-03 17:53 UTCMITRE cvelistV5CVSS v3 → 6.1 · severity → MEDIUM
  28. 2026-08-03 07:22 UTCNVD update
  29. 2026-08-03 06:35 UTCEG score recompute
  30. 2026-08-03 06:33 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-15383?
CVE-2026-15383 is a medium vulnerability published on August 3, 2026. The Blog Floating Button WordPress plugin through 1.4.20 does not sanitize or escape the visitor User-Agent header, which it stores through an unauthenticated tracking REST endpoint and later renders unescaped in an administrator report page. This allows an unauthenticated attacker to store a…
When was CVE-2026-15383 disclosed?
CVE-2026-15383 was first published in the National Vulnerability Database on August 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-15383 actively exploited?
CVE-2026-15383 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 94.1% of all scored CVEs.
What is the CVSS score of CVE-2026-15383?
CVE-2026-15383 has a CVSS v3.1 base score of 6.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-15383?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-15383, 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-2026-15383

Explore →

Is Your Infrastructure Affected by CVE-2026-15383?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs