CVE-2026-88824

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-19. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 4 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: None knownExposed: 0

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

The Master Blocks WordPress plugin before 1.5.0 does not have authorisation on one of its REST routes, allowing unauthenticated users to update its settings, including a value that is output unescaped in the admin area, leading to Stored XSS that executes in the session of any administrator visiting a wp-admin page.

CVSS v3
8.8
EG Score
8.8(high)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity88% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
7%
KEV
Not listed

Published

September 19, 2026

Last Modified

September 19, 2026

Advisory Details (1)

Auto-updated Sep 19, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

Master Blocks 1.4.1 – 1.4.1.4 – Unauthenticated Stored XSS via White Label Settings | CVE 2026-88824 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/898fda0a-4d27-4def-ae6f-35bf25a8ae8d/

Vendor Advisories for CVE-2026-88824(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 10× in last 7d / 10× 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. 2026-09-20 14:43 UTCGHSA enrichment
  2. 2026-09-20 02:35 UTCEG score recompute
  3. 2026-09-20 02:35 UTCGHSA enrichment
  4. 2026-09-19 14:27 UTCGHSA enrichment
  5. 2026-09-19 13:25 UTCEG score recompute▲ 8.80
  6. 2026-09-19 13:25 UTCGHSA enrichment
  7. 2026-09-19 13:24 UTCMITRE cvelistV5CVSS v3 → 8.8 · severity → HIGH
  8. 2026-09-19 07:17 UTCNVD update
  9. 2026-09-19 06:26 UTCEG score recompute
  10. 2026-09-19 06:25 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-88824?
CVE-2026-88824 is a high vulnerability published on September 19, 2026. The Master Blocks WordPress plugin before 1.5.0 does not have authorisation on one of its REST routes, allowing unauthenticated users to update its settings, including a value that is output unescaped in the admin area, leading to Stored XSS that executes in the session of any administrator…
When was CVE-2026-88824 disclosed?
CVE-2026-88824 was first published in the National Vulnerability Database on September 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-88824 actively exploited?
CVE-2026-88824 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 93.3% of all scored CVEs.
What is the CVSS score of CVE-2026-88824?
CVE-2026-88824 has a CVSS v3.1 base score of 8.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-88824?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-88824, 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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