CVE-2026-27536

HIGHPre-NVD 7.17.1—
EchelonGraph scoreHIGH confidence

Score 7.1 from GitHub Security Advisory (severity: HIGH) published 2026-08-13. a secondary CVSS source baseline 7.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.1Exploit: None knownExposed: 0

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

Unauthenticated Cross Site Scripting (XSS) in MailChimp Subscribe Forms <= 4.3.3 versions.

CVSS v3
7.1
EG Score
7.1(high)
EG Risk
32(Track)
EG Risk 32/100SSVC: 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
Severity71% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
8%
KEV
Not listed

Published

August 13, 2026

Last Modified

August 14, 2026

Advisory Details (1)

Auto-updated Aug 13, 2026
No patch confirmed yet.
generic

Cross Site Scripting (XSS) in WordPress MailChimp Subscribe Forms Plugin - Patchstack

https://patchstack.com/database/wordpress/plugin/mailchimp-subscribe-sm/vulnerability/wordpress-mailchimp-subscribe-forms-plugin-4-3-3-cross-site-scripting-xss-vulnerability?_s_id=cve

Vendor Advisories for CVE-2026-27536(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 29× in last 7d / 36× 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. 2026-08-21 01:34 UTCEG score recompute
  2. 2026-08-21 01:34 UTCGHSA enrichment
  3. 2026-08-20 22:55 UTCEPSS rescore
  4. 2026-08-20 14:04 UTCGHSA enrichment
  5. 2026-08-20 02:09 UTCEG score recompute
  6. 2026-08-20 02:09 UTCGHSA enrichment
  7. 2026-08-19 17:03 UTCEPSS rescore
  8. 2026-08-19 14:39 UTCGHSA enrichment
  9. 2026-08-19 03:08 UTCGHSA enrichment
  10. 2026-08-18 15:36 UTCEG score recompute
  11. 2026-08-18 15:36 UTCGHSA enrichment
  12. 2026-08-18 13:48 UTCEPSS rescore
  13. 2026-08-18 04:01 UTCGHSA enrichment
  14. 2026-08-17 16:29 UTCEG score recompute
  15. 2026-08-17 16:29 UTCGHSA enrichment
  16. 2026-08-17 13:47 UTCEPSS rescore
  17. 2026-08-17 04:50 UTCGHSA enrichment
  18. 2026-08-16 17:20 UTCEG score recompute
  19. 2026-08-16 17:20 UTCGHSA enrichment
  20. 2026-08-16 14:56 UTCEPSS rescore
  21. 2026-08-16 05:49 UTCEG score recompute
  22. 2026-08-16 05:49 UTCGHSA enrichment
  23. 2026-08-16 02:14 UTCEPSS rescore
  24. 2026-08-15 18:19 UTCGHSA enrichment
  25. 2026-08-15 06:49 UTCEG score recompute
Show 11 more
  1. 2026-08-15 06:49 UTCGHSA enrichment
  2. 2026-08-15 01:30 UTCEPSS rescore
  3. 2026-08-14 19:18 UTCGHSA enrichment
  4. 2026-08-14 15:30 UTCGHSA enrichment
  5. 2026-08-14 03:59 UTCGHSA enrichment
  6. 2026-08-13 16:29 UTCEG score recompute
  7. 2026-08-13 16:29 UTCGHSA enrichment
  8. 2026-08-13 15:34 UTCEG score recompute
  9. 2026-08-13 14:23 UTCEG score recompute
  10. 2026-08-13 13:54 UTCEG score recompute
  11. 2026-08-13 13:51 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-27536?
CVE-2026-27536 is a high vulnerability published on August 13, 2026. Unauthenticated Cross Site Scripting (XSS) in MailChimp Subscribe Forms <= 4.3.3 versions.
When was CVE-2026-27536 disclosed?
CVE-2026-27536 was first published in the National Vulnerability Database on August 13, 2026, with the most recent update on August 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-27536 actively exploited?
CVE-2026-27536 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 92.1% of all scored CVEs.
What is the CVSS score of CVE-2026-27536?
CVE-2026-27536 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2026-27536?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-27536, 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-2026-27536

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