CVE-2026-18386

MEDIUMPre-NVD 4.94.9—
EchelonGraph scoreHIGH confidence

Score 4.9 from GitHub Security Advisory published 2026-09-10. A secondary CVSS source baseline 4.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
4.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 4.9Exploit: 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 WP BackItUp Community Edition plugin for WordPress is vulnerable to Directory Traversal in all versions up to, and including, 2.1.0 via the 'backup_file' parameter parameter. This makes it possible for authenticated attackers, with administrator-level access and above, to read the contents of arbitrary files on the server, which can contain sensitive information. The basename() normalization present in the handler only executes when the traversed target path does not exist, providing no protection against reads of existing files.

CVSS v3
4.9
EG Score
4.9MEDIUMhigh confidence
EG Risk
22
EG Risk 22/100CISA 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
Severity49% × 45%
Exploitation1% × 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
0.7%
EPSS %ILE
52nd
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 10, 2026

Last Modified

September 10, 2026

References (9)

Vendor Advisories for CVE-2026-18386(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 / 69× 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. 2026-10-04 23:21 UTCEPSS rescore
  2. 2026-10-04 14:01 UTCEG score recompute
  3. 2026-10-04 14:01 UTCGHSA enrichment
  4. 2026-10-03 14:25 UTCEPSS rescore
  5. 2026-10-03 13:19 UTCEG score recompute
  6. 2026-10-03 13:19 UTCGHSA enrichment
  7. 2026-10-02 12:36 UTCEG score recompute
  8. 2026-10-02 12:36 UTCGHSA enrichment
  9. 2026-10-01 19:49 UTCEPSS rescore
  10. 2026-10-01 11:23 UTCEG score recompute
  11. 2026-10-01 11:23 UTCGHSA enrichment
  12. 2026-09-30 15:02 UTCEPSS rescore
  13. 2026-09-30 10:42 UTCEG score recompute
  14. 2026-09-30 10:42 UTCGHSA enrichment
  15. 2026-09-29 15:20 UTCEPSS rescore
  16. 2026-09-29 09:54 UTCEG score recompute
  17. 2026-09-29 09:54 UTCGHSA enrichment
  18. 2026-09-28 13:51 UTCEPSS rescore
  19. 2026-09-28 09:12 UTCEG score recompute
  20. 2026-09-28 09:12 UTCGHSA enrichment
  21. 2026-09-27 13:47 UTCEPSS rescore
  22. 2026-09-27 08:31 UTCEG score recompute
  23. 2026-09-27 08:31 UTCGHSA enrichment
  24. 2026-09-26 15:58 UTCEPSS rescore
  25. 2026-09-26 07:48 UTCEG score recompute
Show 44 more
  1. 2026-09-26 07:48 UTCGHSA enrichment
  2. 2026-09-25 07:06 UTCEG score recompute
  3. 2026-09-25 07:06 UTCGHSA enrichment
  4. 2026-09-24 06:24 UTCEG score recompute
  5. 2026-09-24 06:24 UTCGHSA enrichment
  6. 2026-09-23 05:42 UTCEG score recompute
  7. 2026-09-23 05:42 UTCGHSA enrichment
  8. 2026-09-22 05:01 UTCEG score recompute
  9. 2026-09-22 05:00 UTCGHSA enrichment
  10. 2026-09-21 04:17 UTCEG score recompute
  11. 2026-09-21 04:17 UTCGHSA enrichment
  12. 2026-09-20 03:35 UTCEG score recompute
  13. 2026-09-20 03:35 UTCGHSA enrichment
  14. 2026-09-19 02:53 UTCEG score recompute
  15. 2026-09-19 02:53 UTCGHSA enrichment
  16. 2026-09-18 19:27 UTCEPSS rescore
  17. 2026-09-18 02:12 UTCEG score recompute
  18. 2026-09-18 02:12 UTCGHSA enrichment
  19. 2026-09-17 01:30 UTCEG score recompute
  20. 2026-09-17 01:30 UTCGHSA enrichment
  21. 2026-09-16 14:07 UTCEPSS rescore
  22. 2026-09-16 05:14 UTCEPSS rescore
  23. 2026-09-16 00:48 UTCEG score recompute
  24. 2026-09-16 00:48 UTCGHSA enrichment
  25. 2026-09-15 00:06 UTCGHSA enrichment
  26. 2026-09-13 23:24 UTCEG score recompute
  27. 2026-09-13 23:24 UTCGHSA enrichment
  28. 2026-09-13 16:46 UTCEPSS rescore
  29. 2026-09-12 22:43 UTCEG score recompute
  30. 2026-09-12 22:43 UTCGHSA enrichment
  31. 2026-09-12 15:00 UTCEPSS rescore
  32. 2026-09-11 22:01 UTCEG score recompute
  33. 2026-09-11 22:01 UTCGHSA enrichment
  34. 2026-09-11 14:52 UTCEPSS rescore
  35. 2026-09-11 09:36 UTCEPSS rescore
  36. 2026-09-10 21:19 UTCEG score recompute
  37. 2026-09-10 21:19 UTCGHSA enrichment
  38. 2026-09-10 21:05 UTCEG score recompute
  39. 2026-09-10 21:05 UTCGHSA enrichment
  40. 2026-09-10 14:58 UTCEG score recompute
  41. 2026-09-10 14:58 UTCGHSA enrichment
  42. 2026-09-10 04:34 UTCEG score recompute
  43. 2026-09-10 03:50 UTCEG score recompute
  44. 2026-09-10 03:49 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-18386?
CVE-2026-18386 is a medium vulnerability published on September 10, 2026. The WP BackItUp Community Edition plugin for WordPress is vulnerable to Directory Traversal in all versions up to, and including, 2.1.0 via the 'backup_file' parameter parameter. This makes it possible for authenticated attackers, with administrator-level access and above, to read the contents of…
When was CVE-2026-18386 disclosed?
CVE-2026-18386 was first published on September 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18386 actively exploited?
CVE-2026-18386 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (52nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-18386?
CVE-2026-18386 has a CVSS base score of 4.9 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-18386?
No fix for CVE-2026-18386 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-2026-18386 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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