CVE-2026-86790

MEDIUMPre-NVD 6.86.8—
EchelonGraph scoreHIGH confidence

Score 6.8 from GitHub Security Advisory published 2026-09-12. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 6.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
6.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.8Exploit: None knownExposed: 0

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

The WP Highlight Box WordPress plugin through 1.0 does not escape some shortcode attributes before outputting them in a page where the shortcode is embedded, which could allow users with the contributor role and above to perform Stored Cross-Site Scripting attacks.

CVSS v3
6.8
EG Score
6.8(high)
EG Risk
31(Track)
EG Risk 31/100SSVC: 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
Severity68% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
35%
KEV
Not listed

Published

September 12, 2026

Last Modified

September 14, 2026

Advisory Details (1)

Auto-updated Sep 12, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

WP Highlight Box <= 1.0 – Contributor+ Stored XSS via highlight-box Shortcode | CVE 2026-86790 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/b48571ae-368e-4193-977a-f22fb09db4d4/

Vendor Advisories for CVE-2026-86790(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 22× in last 7d / 44× 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. 2026-09-24 21:43 UTCEG score recompute
  2. 2026-09-24 21:43 UTCGHSA enrichment
  3. 2026-09-24 14:04 UTCEPSS rescore
  4. 2026-09-23 23:12 UTCEG score recompute
  5. 2026-09-23 23:11 UTCGHSA enrichment
  6. 2026-09-23 17:54 UTCEPSS rescore
  7. 2026-09-23 01:24 UTCEG score recompute
  8. 2026-09-23 01:24 UTCGHSA enrichment
  9. 2026-09-22 16:01 UTCEPSS rescore
  10. 2026-09-22 03:46 UTCEG score recompute
  11. 2026-09-22 03:46 UTCGHSA enrichment
  12. 2026-09-21 21:09 UTCEPSS rescore
  13. 2026-09-21 06:08 UTCEG score recompute
  14. 2026-09-21 06:08 UTCGHSA enrichment
  15. 2026-09-20 20:16 UTCEPSS rescore
  16. 2026-09-20 08:30 UTCEG score recompute
  17. 2026-09-20 08:30 UTCGHSA enrichment
  18. 2026-09-19 10:52 UTCEG score recompute
  19. 2026-09-19 10:52 UTCGHSA enrichment
  20. 2026-09-18 19:28 UTCEPSS rescore
  21. 2026-09-18 13:15 UTCEG score recompute
  22. 2026-09-18 13:15 UTCGHSA enrichment
  23. 2026-09-17 19:32 UTCEPSS rescore
  24. 2026-09-17 15:37 UTCGHSA enrichment
  25. 2026-09-16 17:59 UTCEG score recompute
Show 19 more
  1. 2026-09-16 17:59 UTCGHSA enrichment
  2. 2026-09-16 14:09 UTCEPSS rescore
  3. 2026-09-16 05:15 UTCEPSS rescore
  4. 2026-09-15 18:56 UTCEG score recompute
  5. 2026-09-15 18:56 UTCGHSA enrichment
  6. 2026-09-15 03:12 UTCEPSS rescore
  7. 2026-09-15 03:12 UTCEPSS rescore
  8. 2026-09-14 21:18 UTCGHSA enrichment
  9. 2026-09-14 11:38 UTCEG score recompute
  10. 2026-09-14 11:38 UTCGHSA enrichment
  11. 2026-09-13 14:01 UTCEG score recompute
  12. 2026-09-13 14:01 UTCGHSA enrichment
  13. 2026-09-12 16:23 UTCGHSA enrichment
  14. 2026-09-12 15:44 UTCEG score recompute▲ 6.80
  15. 2026-09-12 15:44 UTCGHSA enrichment
  16. 2026-09-12 15:43 UTCMITRE cvelistV5CVSS v3 → 6.8 · severity → MEDIUM
  17. 2026-09-12 06:20 UTCNVD update
  18. 2026-09-12 06:14 UTCEG score recompute
  19. 2026-09-12 06:13 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-86790?
CVE-2026-86790 is a medium vulnerability published on September 12, 2026. The WP Highlight Box WordPress plugin through 1.0 does not escape some shortcode attributes before outputting them in a page where the shortcode is embedded, which could allow users with the contributor role and above to perform Stored Cross-Site Scripting attacks.
When was CVE-2026-86790 disclosed?
CVE-2026-86790 was first published in the National Vulnerability Database on September 12, 2026, with the most recent update on September 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-86790 actively exploited?
CVE-2026-86790 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 65.4% of all scored CVEs.
What is the CVSS score of CVE-2026-86790?
CVE-2026-86790 has a CVSS v3.1 base score of 6.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-86790?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-86790, 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-2026-86790

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