CVE-2026-19887

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-05. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 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: 1%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 Welcart e-Commerce plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 2.12.1 via deserialization of untrusted input in the Telecom EDY payment callback (usces_action_acting_transaction). Unauthenticated attackers can store arbitrary 'reserve' key/value pairs as order metadata during a public checkout, then invoke the callback with an attacker-chosen 'option' parameter to select and unserialize that metadata without any provider signature, source-address, transaction-identity or ownership check. A POP chain is present in the TCPDF library bundled with the plugin itself, so no additional plugin or theme is required. This makes it possible for unauthenticated attackers to delete arbitrary files on the server, including wp-config.php, which can lead to remote code execution when an attacker re-runs the WordPress installer against a database they control. Successful exploitation is contingent on an admin printing an invoice to trigger file deletion.

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%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
46%
KEV
Not listed

Published

September 5, 2026

Last Modified

September 8, 2026

References (10)

Vendor Advisories for CVE-2026-19887(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 24× in last 7d / 64× 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. 2026-09-21 01:37 UTCEG score recompute
  2. 2026-09-21 01:37 UTCGHSA enrichment
  3. 2026-09-20 13:22 UTCGHSA enrichment
  4. 2026-09-20 00:57 UTCEG score recompute
  5. 2026-09-20 00:57 UTCGHSA enrichment
  6. 2026-09-19 12:42 UTCGHSA enrichment
  7. 2026-09-19 00:27 UTCEG score recompute
  8. 2026-09-19 00:27 UTCGHSA enrichment
  9. 2026-09-18 19:27 UTCEPSS rescore
  10. 2026-09-18 12:11 UTCGHSA enrichment
  11. 2026-09-17 23:56 UTCEG score recompute
  12. 2026-09-17 23:56 UTCGHSA enrichment
  13. 2026-09-17 10:56 UTCGHSA enrichment
  14. 2026-09-16 22:41 UTCEG score recompute
  15. 2026-09-16 22:41 UTCGHSA enrichment
  16. 2026-09-16 14:07 UTCEPSS rescore
  17. 2026-09-16 10:25 UTCEG score recompute
  18. 2026-09-16 10:25 UTCGHSA enrichment
  19. 2026-09-16 05:14 UTCEPSS rescore
  20. 2026-09-15 22:10 UTCGHSA enrichment
  21. 2026-09-15 09:55 UTCEG score recompute
  22. 2026-09-15 09:55 UTCGHSA enrichment
  23. 2026-09-14 21:40 UTCGHSA enrichment
  24. 2026-09-14 09:25 UTCGHSA enrichment
  25. 2026-09-13 21:10 UTCEG score recompute
Show 39 more
  1. 2026-09-13 21:10 UTCGHSA enrichment
  2. 2026-09-13 16:46 UTCEPSS rescore
  3. 2026-09-13 08:55 UTCGHSA enrichment
  4. 2026-09-12 20:40 UTCEG score recompute
  5. 2026-09-12 20:40 UTCGHSA enrichment
  6. 2026-09-12 15:00 UTCEPSS rescore
  7. 2026-09-12 08:25 UTCGHSA enrichment
  8. 2026-09-11 20:09 UTCEG score recompute
  9. 2026-09-11 20:09 UTCGHSA enrichment
  10. 2026-09-11 14:52 UTCEPSS rescore
  11. 2026-09-11 09:36 UTCEPSS rescore
  12. 2026-09-11 07:31 UTCGHSA enrichment
  13. 2026-09-10 19:16 UTCEG score recompute
  14. 2026-09-10 19:16 UTCGHSA enrichment
  15. 2026-09-10 09:34 UTCEPSS rescore
  16. 2026-09-10 07:01 UTCGHSA enrichment
  17. 2026-09-09 18:46 UTCGHSA enrichment
  18. 2026-09-09 06:30 UTCEG score recompute
  19. 2026-09-09 06:30 UTCGHSA enrichment
  20. 2026-09-08 22:00 UTCEPSS rescore
  21. 2026-09-08 18:15 UTCEG score recompute
  22. 2026-09-08 18:15 UTCGHSA enrichment
  23. 2026-09-08 17:03 UTCEG score recompute
  24. 2026-09-08 17:02 UTCGHSA enrichment
  25. 2026-09-08 14:15 UTCGHSA enrichment
  26. 2026-09-08 09:58 UTCGHSA enrichment
  27. 2026-09-07 20:43 UTCEG score recompute
  28. 2026-09-07 20:43 UTCGHSA enrichment
  29. 2026-09-07 16:01 UTCEPSS rescore
  30. 2026-09-07 08:28 UTCGHSA enrichment
  31. 2026-09-06 20:09 UTCEG score recompute
  32. 2026-09-06 20:08 UTCGHSA enrichment
  33. 2026-09-06 13:47 UTCEPSS rescore
  34. 2026-09-06 07:53 UTCGHSA enrichment
  35. 2026-09-05 19:38 UTCEG score recompute
  36. 2026-09-05 19:38 UTCGHSA enrichment
  37. 2026-09-05 07:24 UTCEG score recompute
  38. 2026-09-05 06:49 UTCEG score recompute
  39. 2026-09-05 06:48 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-19887?
CVE-2026-19887 is a high vulnerability published on September 5, 2026. The Welcart e-Commerce plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 2.12.1 via deserialization of untrusted input in the Telecom EDY payment callback (uscesactionacting_transaction). Unauthenticated attackers can store arbitrary 'reserve'…
When was CVE-2026-19887 disclosed?
CVE-2026-19887 was first published in the National Vulnerability Database on September 5, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-19887 actively exploited?
CVE-2026-19887 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 53.9% of all scored CVEs.
What is the CVSS score of CVE-2026-19887?
CVE-2026-19887 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-19887?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-19887, 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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