CVE-2026-8151

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreHIGH confidence

Score 5.4 from GitHub Security Advisory published 2026-09-02. A secondary CVSS source baseline 5.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 5.4Exploit: Elevated riskExposed services: Not assessed

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

The Simple Membership MailChimp Integration WordPress plugin before 1.9.8 does not have CSRF checks in its settings page, allowing attackers to trick a logged-in administrator into changing the configured third-party API key. Once replaced, all subsequent member registration data (name, email, membership level) is sent to the attacker-controlled account.

CVSS v3
5.4
EG Score
5.4MEDIUMhigh confidence
EG Risk
40
EG Risk 40/100CISA 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
Severity54% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
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
2nd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

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 public PoC (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 2, 2026

Last Modified

September 3, 2026

Advisory Details (1)

Auto-updated Sep 2, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

Simple Membership MailChimp Integration < 1.9.8 – API Key Update via CSRF | CVE 2026-8151 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/c7002cf8-83db-4e1f-a6e9-230293290635/

Vendor Advisories for CVE-2026-8151(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 18× in last 7d / 72× 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. 2026-09-29 12:06 UTCEG score recompute
  2. 2026-09-29 12:06 UTCGHSA enrichment
  3. 2026-09-28 13:52 UTCEPSS rescore
  4. 2026-09-28 13:52 UTCEPSS rescore
  5. 2026-09-28 09:43 UTCEG score recompute
  6. 2026-09-28 09:43 UTCGHSA enrichment
  7. 2026-09-27 13:49 UTCEPSS rescore
  8. 2026-09-27 07:20 UTCEG score recompute
  9. 2026-09-27 07:20 UTCGHSA enrichment
  10. 2026-09-26 15:59 UTCEPSS rescore
  11. 2026-09-26 04:57 UTCEG score recompute
  12. 2026-09-26 04:57 UTCGHSA enrichment
  13. 2026-09-26 04:55 UTCGHSA enrichment
  14. 2026-09-24 16:47 UTCEG score recompute
  15. 2026-09-24 16:47 UTCGHSA enrichment
  16. 2026-09-24 14:04 UTCEPSS rescore
  17. 2026-09-23 14:24 UTCEG score recompute
  18. 2026-09-23 14:24 UTCGHSA enrichment
  19. 2026-09-22 16:01 UTCEPSS rescore
  20. 2026-09-22 12:00 UTCEG score recompute
  21. 2026-09-22 12:00 UTCGHSA enrichment
  22. 2026-09-21 21:09 UTCEPSS rescore
  23. 2026-09-21 09:37 UTCEG score recompute
  24. 2026-09-21 09:37 UTCGHSA enrichment
  25. 2026-09-20 20:16 UTCEPSS rescore
Show 47 more
  1. 2026-09-20 07:14 UTCEG score recompute
  2. 2026-09-20 07:14 UTCGHSA enrichment
  3. 2026-09-19 04:03 UTCEG score recompute
  4. 2026-09-19 04:03 UTCGHSA enrichment
  5. 2026-09-18 19:28 UTCEPSS rescore
  6. 2026-09-18 01:40 UTCEG score recompute
  7. 2026-09-18 01:40 UTCGHSA enrichment
  8. 2026-09-17 19:32 UTCEPSS rescore
  9. 2026-09-16 23:17 UTCEG score recompute
  10. 2026-09-16 23:17 UTCGHSA enrichment
  11. 2026-09-16 14:09 UTCEPSS rescore
  12. 2026-09-16 05:15 UTCEPSS rescore
  13. 2026-09-15 20:53 UTCEG score recompute
  14. 2026-09-15 20:53 UTCGHSA enrichment
  15. 2026-09-15 03:12 UTCEPSS rescore
  16. 2026-09-14 18:24 UTCEG score recompute
  17. 2026-09-14 18:24 UTCGHSA enrichment
  18. 2026-09-13 16:48 UTCEPSS rescore
  19. 2026-09-13 15:39 UTCEG score recompute
  20. 2026-09-13 15:39 UTCGHSA enrichment
  21. 2026-09-12 15:02 UTCEPSS rescore
  22. 2026-09-12 13:16 UTCEG score recompute
  23. 2026-09-12 13:16 UTCGHSA enrichment
  24. 2026-09-11 14:53 UTCEPSS rescore
  25. 2026-09-11 10:53 UTCEG score recompute
  26. 2026-09-11 10:53 UTCGHSA enrichment
  27. 2026-09-10 08:29 UTCGHSA enrichment
  28. 2026-09-09 06:04 UTCEG score recompute
  29. 2026-09-09 06:03 UTCGHSA enrichment
  30. 2026-09-08 22:01 UTCEPSS rescore
  31. 2026-09-08 03:40 UTCEG score recompute
  32. 2026-09-08 03:40 UTCGHSA enrichment
  33. 2026-09-07 01:16 UTCEG score recompute
  34. 2026-09-07 01:16 UTCGHSA enrichment
  35. 2026-09-06 13:48 UTCEPSS rescore
  36. 2026-09-05 22:53 UTCEG score recompute
  37. 2026-09-05 22:53 UTCGHSA enrichment
  38. 2026-09-05 15:31 UTCEPSS rescore
  39. 2026-09-04 20:30 UTCEG score recompute
  40. 2026-09-04 20:30 UTCGHSA enrichment
  41. 2026-09-04 05:07 UTCEPSS rescore
  42. 2026-09-03 18:02 UTCEG score recompute
  43. 2026-09-03 18:02 UTCGHSA enrichment
  44. 2026-09-02 15:31 UTCEG score recompute
  45. 2026-09-02 15:08 UTCEG score recompute
  46. 2026-09-02 14:30 UTCEG score recompute
  47. 2026-09-02 14:26 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-8151?
CVE-2026-8151 is a medium vulnerability published on September 2, 2026. The Simple Membership MailChimp Integration WordPress plugin before 1.9.8 does not have CSRF checks in its settings page, allowing attackers to trick a logged-in administrator into changing the configured third-party API key. Once replaced, all subsequent member registration data (name, email,…
When was CVE-2026-8151 disclosed?
CVE-2026-8151 was first published on September 2, 2026, with the most recent update on September 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8151 actively exploited?
CVE-2026-8151 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (2nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-8151?
CVE-2026-8151 has a CVSS base score of 5.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-8151?
No fix for CVE-2026-8151 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-2026-8151 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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