CVE-2026-19991

HIGHPre-NVD 8.18.1—
EchelonGraph scoreHIGH confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-09-11. A secondary CVSS source baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.1EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 8.1Exploit: 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 UsersWP plugin for WordPress is vulnerable to Arbitrary File Deletion in versions up to, and including, 1.2.70 via the upload_file_remove() AJAX handler. The plugin stores the value of an account 'file' form field taken directly from $_POST when no real $_FILES upload is provided (process_account() calls uwp_validate_fields() and array_merges the result with the empty output of UsersWP_Files::validate_uploads()). At storage time the value is only checked with validate_file(), which passes any string that does not contain a literal '../'. When the value is later processed by upload_file_remove(), it is again gated with validate_file() and then normalized through uwp_get_file_relative_url(); that helper performs a global str_replace() of the uploads base URL against the stored URL, allowing a crafted URL containing embedded '..' tokens to collapse into '../../' traversal sequences after the last validation. The transformed value is then appended to the uploads base directory and passed to wp_delete_file() without any canonical containment check. This makes it possible for authenticated attackers, with Subscriber-level access and above, to delete arbitrary files on the affected site's server (including wp-config.

CVSS v3
8.1
EG Score
8.1HIGHhigh confidence
EG Risk
37
EG Risk 37/100CISA 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
Severity81% × 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
0.4%
EPSS %ILE
32nd
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 11, 2026

Last Modified

September 11, 2026

References (7)

Vendor Advisories for CVE-2026-19991(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 27× in last 7d / 93× 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. 2026-10-05 10:41 UTCEG score recompute
  2. 2026-10-05 10:41 UTCGHSA enrichment
  3. 2026-10-04 23:21 UTCEPSS rescore
  4. 2026-10-04 23:10 UTCGHSA enrichment
  5. 2026-10-04 11:43 UTCGHSA enrichment
  6. 2026-10-04 00:15 UTCEG score recompute
  7. 2026-10-04 00:15 UTCGHSA enrichment
  8. 2026-10-03 12:07 UTCGHSA enrichment
  9. 2026-10-03 00:10 UTCEG score recompute
  10. 2026-10-03 00:10 UTCGHSA enrichment
  11. 2026-10-02 12:36 UTCGHSA enrichment
  12. 2026-10-02 00:22 UTCEG score recompute
  13. 2026-10-02 00:22 UTCGHSA enrichment
  14. 2026-10-01 19:49 UTCEPSS rescore
  15. 2026-10-01 12:49 UTCGHSA enrichment
  16. 2026-10-01 01:23 UTCEG score recompute
  17. 2026-10-01 01:22 UTCGHSA enrichment
  18. 2026-09-30 15:03 UTCEPSS rescore
  19. 2026-09-30 13:55 UTCGHSA enrichment
  20. 2026-09-30 01:51 UTCEG score recompute
  21. 2026-09-30 01:51 UTCGHSA enrichment
  22. 2026-09-29 15:21 UTCEPSS rescore
  23. 2026-09-29 06:08 UTCEG score recompute
  24. 2026-09-29 06:08 UTCGHSA enrichment
  25. 2026-09-28 18:41 UTCEG score recompute
Show 68 more
  1. 2026-09-28 18:41 UTCGHSA enrichment
  2. 2026-09-28 13:51 UTCEPSS rescore
  3. 2026-09-28 06:31 UTCGHSA enrichment
  4. 2026-09-27 19:04 UTCEG score recompute
  5. 2026-09-27 19:04 UTCGHSA enrichment
  6. 2026-09-27 13:47 UTCEPSS rescore
  7. 2026-09-27 07:37 UTCGHSA enrichment
  8. 2026-09-26 20:10 UTCEG score recompute
  9. 2026-09-26 20:10 UTCGHSA enrichment
  10. 2026-09-26 15:58 UTCEPSS rescore
  11. 2026-09-26 08:39 UTCEG score recompute
  12. 2026-09-26 08:39 UTCGHSA enrichment
  13. 2026-09-25 21:12 UTCGHSA enrichment
  14. 2026-09-25 06:25 UTCGHSA enrichment
  15. 2026-09-24 18:58 UTCEG score recompute
  16. 2026-09-24 18:58 UTCGHSA enrichment
  17. 2026-09-24 07:31 UTCGHSA enrichment
  18. 2026-09-23 20:03 UTCEG score recompute
  19. 2026-09-23 20:03 UTCGHSA enrichment
  20. 2026-09-23 08:36 UTCGHSA enrichment
  21. 2026-09-22 21:08 UTCEG score recompute
  22. 2026-09-22 21:08 UTCGHSA enrichment
  23. 2026-09-22 09:41 UTCGHSA enrichment
  24. 2026-09-21 22:14 UTCEG score recompute
  25. 2026-09-21 22:13 UTCGHSA enrichment
  26. 2026-09-21 10:46 UTCGHSA enrichment
  27. 2026-09-20 23:19 UTCEG score recompute
  28. 2026-09-20 23:19 UTCGHSA enrichment
  29. 2026-09-20 11:51 UTCGHSA enrichment
  30. 2026-09-20 00:20 UTCEG score recompute
  31. 2026-09-20 00:20 UTCGHSA enrichment
  32. 2026-09-19 12:52 UTCGHSA enrichment
  33. 2026-09-19 01:25 UTCEG score recompute
  34. 2026-09-19 01:24 UTCGHSA enrichment
  35. 2026-09-18 19:27 UTCEPSS rescore
  36. 2026-09-18 13:57 UTCGHSA enrichment
  37. 2026-09-18 02:27 UTCEG score recompute
  38. 2026-09-18 02:27 UTCGHSA enrichment
  39. 2026-09-17 14:59 UTCGHSA enrichment
  40. 2026-09-17 03:32 UTCGHSA enrichment
  41. 2026-09-16 16:05 UTCEG score recompute
  42. 2026-09-16 16:05 UTCGHSA enrichment
  43. 2026-09-16 14:07 UTCEPSS rescore
  44. 2026-09-16 05:14 UTCEPSS rescore
  45. 2026-09-16 04:37 UTCGHSA enrichment
  46. 2026-09-15 17:10 UTCGHSA enrichment
  47. 2026-09-15 05:42 UTCEG score recompute
  48. 2026-09-15 05:42 UTCGHSA enrichment
  49. 2026-09-14 18:15 UTCGHSA enrichment
  50. 2026-09-14 06:38 UTCGHSA enrichment
  51. 2026-09-13 19:11 UTCEG score recompute
  52. 2026-09-13 19:11 UTCGHSA enrichment
  53. 2026-09-13 16:46 UTCEPSS rescore
  54. 2026-09-13 07:43 UTCGHSA enrichment
  55. 2026-09-12 20:16 UTCEG score recompute
  56. 2026-09-12 20:16 UTCGHSA enrichment
  57. 2026-09-12 15:00 UTCEPSS rescore
  58. 2026-09-12 08:49 UTCGHSA enrichment
  59. 2026-09-11 21:22 UTCEG score recompute
  60. 2026-09-11 21:22 UTCGHSA enrichment
  61. 2026-09-11 20:34 UTCEG score recompute
  62. 2026-09-11 20:34 UTCGHSA enrichment
  63. 2026-09-11 14:52 UTCEPSS rescore
  64. 2026-09-11 13:32 UTCEG score recompute
  65. 2026-09-11 13:32 UTCGHSA enrichment
  66. 2026-09-11 04:20 UTCEG score recompute
  67. 2026-09-11 03:50 UTCEG score recompute
  68. 2026-09-11 03:49 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-19991?
CVE-2026-19991 is a high vulnerability published on September 11, 2026. The UsersWP plugin for WordPress is vulnerable to Arbitrary File Deletion in versions up to, and including, 1.2.70 via the uploadfileremove() AJAX handler. The plugin stores the value of an account 'file' form field taken directly from $POST when no real $FILES upload is provided (processaccount()…
When was CVE-2026-19991 disclosed?
CVE-2026-19991 was first published on September 11, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-19991 actively exploited?
CVE-2026-19991 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (32nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-19991?
CVE-2026-19991 has a CVSS base score of 8.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-19991?
No fix for CVE-2026-19991 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-2026-19991 are linked in the Vendor Advisories panel on this page.

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