CVE-2026-89303

MEDIUMPre-NVD 6.46.4—
EchelonGraph scoreHIGH confidence

Score 6.4 from GitHub Security Advisory published 2026-09-28. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 6.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 5 sources updated this week
6.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 6.4Exploit: None knownExposed services: Not assessed

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

The Post Voting System WordPress plugin through 1.0 does not properly sanitize and escape a parameter before using it in a SQL query, allowing any authenticated user to perform SQL injection attacks.

CVSS v3
6.4
EG Score
6.4MEDIUMhigh confidence
EG Risk
29
EG Risk 29/100CISA SSVC

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
Severity64% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.1%
EPSS %ILE
3rd
KEV
Not listed

CISA SSVCTrack at every mission impact level.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 28, 2026

Last Modified

September 28, 2026

Advisory Details (1)

Auto-updated Sep 28, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

Post Voting System <= 1.0 – Subscriber+ SQLi via 'row' Parameter | CVE 2026-89303 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/dbe62e96-6493-4385-92a2-6281c5428a9f/

Vendor Advisories for CVE-2026-89303(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 / 20× 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. 2026-10-03 15:10 UTCEG score recompute
  2. 2026-10-03 15:10 UTCGHSA enrichment
  3. 2026-10-02 15:38 UTCEG score recompute
  4. 2026-10-02 15:38 UTCGHSA enrichment
  5. 2026-10-01 19:51 UTCEPSS rescore
  6. 2026-10-01 16:07 UTCGHSA enrichment
  7. 2026-09-30 16:35 UTCEG score recompute
  8. 2026-09-30 16:35 UTCGHSA enrichment
  9. 2026-09-30 15:04 UTCEPSS rescore
  10. 2026-09-29 16:46 UTCEG score recompute
  11. 2026-09-29 16:46 UTCGHSA enrichment
  12. 2026-09-28 16:54 UTCGHSA enrichment
  13. 2026-09-28 16:32 UTCGHSA enrichment
  14. 2026-09-28 15:37 UTCEG score recompute▲ 6.40
  15. 2026-09-28 15:37 UTCGHSA enrichment
  16. 2026-09-28 15:36 UTCMITRE cvelistV5CVSS v3 → 6.4 · severity → MEDIUM
  17. 2026-09-28 13:52 UTCEPSS rescore
  18. 2026-09-28 07:26 UTCNVD update
  19. 2026-09-28 06:45 UTCEG score recompute
  20. 2026-09-28 06:42 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-89303?
CVE-2026-89303 is a medium vulnerability published on September 28, 2026. The Post Voting System WordPress plugin through 1.0 does not properly sanitize and escape a parameter before using it in a SQL query, allowing any authenticated user to perform SQL injection attacks.
When was CVE-2026-89303 disclosed?
CVE-2026-89303 was first published on September 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-89303 actively exploited?
CVE-2026-89303 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (3rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-89303?
CVE-2026-89303 has a CVSS v3.1 base score of 6.4 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-89303?
No fix for CVE-2026-89303 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-89303 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-89303

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