CVE-2026-16990

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreHIGH confidence

Score 5.3 from GitHub Security Advisory published 2026-08-12. a secondary CVSS source baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: None knownExposed: 0

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

The Payment Button for PayPal WordPress plugin through 1.2.3.44 does not enforce the merchant-configured price server-side and trusts a client-supplied payment amount, allowing unauthenticated attackers to create a real PayPal order against the merchant for an arbitrary lower amount.

CVSS v3
5.3
EG Score
5.3(high)
EG Risk
39(Track)
EG Risk 39/100SSVC: 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
Severity53% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
9%
KEV
Not listed

Published

August 12, 2026

Last Modified

August 12, 2026

Advisory Details (1)

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

Payment Button for PayPal <= 1.2.3.44 – Unauthenticated Payment Price Manipulation | CVE 2026-16990 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/97c08603-c407-43b2-ab2c-e39f85e89ebe/

Vendor Advisories for CVE-2026-16990(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Data Freshness Timeline

(refreshed 19× in last 7d / 26× 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. 2026-08-20 02:45 UTCEG score recompute
  2. 2026-08-20 02:45 UTCGHSA enrichment
  3. 2026-08-19 17:03 UTCEPSS rescore
  4. 2026-08-19 04:07 UTCEG score recompute
  5. 2026-08-19 04:07 UTCGHSA enrichment
  6. 2026-08-18 13:48 UTCEPSS rescore
  7. 2026-08-18 05:24 UTCGHSA enrichment
  8. 2026-08-17 06:45 UTCEG score recompute
  9. 2026-08-17 06:45 UTCGHSA enrichment
  10. 2026-08-16 14:56 UTCEPSS rescore
  11. 2026-08-16 08:08 UTCEG score recompute
  12. 2026-08-16 08:08 UTCGHSA enrichment
  13. 2026-08-16 02:14 UTCEPSS rescore
  14. 2026-08-15 09:31 UTCEG score recompute
  15. 2026-08-15 09:31 UTCGHSA enrichment
  16. 2026-08-15 01:30 UTCEPSS rescore
  17. 2026-08-14 10:53 UTCEG score recompute
  18. 2026-08-14 10:53 UTCGHSA enrichment
  19. 2026-08-13 22:00 UTCEPSS rescore
  20. 2026-08-13 12:15 UTCGHSA enrichment
  21. 2026-08-12 13:37 UTCEG score recompute
  22. 2026-08-12 13:37 UTCGHSA enrichment
  23. 2026-08-12 12:35 UTCEG score recompute
  24. 2026-08-12 12:35 UTCGHSA enrichment
  25. 2026-08-12 11:34 UTCEG score recompute
Show 1 more
  1. 2026-08-12 11:33 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-16990?
CVE-2026-16990 is a medium vulnerability published on August 12, 2026. The Payment Button for PayPal WordPress plugin through 1.2.3.44 does not enforce the merchant-configured price server-side and trusts a client-supplied payment amount, allowing unauthenticated attackers to create a real PayPal order against the merchant for an arbitrary lower amount.
When was CVE-2026-16990 disclosed?
CVE-2026-16990 was first published in the National Vulnerability Database on August 12, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-16990 actively exploited?
CVE-2026-16990 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 90.5% of all scored CVEs.
What is the CVSS score of CVE-2026-16990?
CVE-2026-16990 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-16990?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-16990, 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-2026-16990

Explore →

Is Your Infrastructure Affected by CVE-2026-16990?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs