CVE-2026-42238

CRITICALNVD 9.89.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.8% (56th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
Elevated
9.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.8%CVSS: 9.8Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

Nginx UI is a web user interface for the Nginx web server. Prior to version 2.3.8, nginx-ui exposes a backup restore endpoint (POST /api/restore) that is completely unauthenticated during the first 10 minutes after process startup on any fresh installation. An unauthenticated remote attacker can upload a crafted backup archive that overwrites the application's configuration file (app.ini) and SQLite database. Because the attacker controls the restored app.ini, they can inject an arbitrary OS command into the TestConfigCmd setting. After the application automatically restarts to apply the restored config, a single follow-up request triggers that command as the user running nginx-ui — typically root in Docker deployments. This issue has been patched in version 2.3.8.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
60
EG Risk 60/100

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 (value × EchelonGraph’s weight)
Severity98% × 45%
The EG Score, 9.8 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.8%
EPSS %ILE
56th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

May 4, 2026

Last Modified

May 6, 2026

Advisory Details (2)

Auto-updated Oct 8, 2026
Patch available. Sources: github_release, github.
GitHub advisoryMentions a patch (unverified)

Unauthenticated Remote Code Execution via Backup Restore in nginx-ui · Advisory · 0xJacky/nginx-ui · GitHub

https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-4pvg-prr3-9cxr
GitHub release Patch Available

v2.3.8

Patch available: 0xJacky/nginx-ui v2.3.8

https://github.com/0xJacky/nginx-ui/releases/tag/v2.3.8

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFix by version rangeDependents
github.com/0xJacky/nginx-ui—
  • every version up to 2.3.8: fixed in 2.3.8
  • every version on: no fix on record
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 15× in last 7d / 31× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 99 of 182 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 1 repeat row among the latest 100 is merged into the row it repeats. The 83 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  2. 2026-10-16 15:19 UTCEG score recompute
  3. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  4. 2026-10-15 15:33 UTCEG score recompute
  5. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  6. 2026-10-14 09:50 UTCEG score recompute
  7. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  8. 2026-10-13 07:43 UTCEG score recompute
  9. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  10. 2026-10-12 16:07 UTCEG score recompute
  11. 2026-10-11 19:49 UTCEG score recompute
  12. 2026-10-11 17:03 UTCEG score recompute
  13. 2026-10-11 14:29 UTCEG score recompute
  14. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  15. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  16. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  17. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  18. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  19. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  20. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  21. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  22. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  23. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  24. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  25. 2026-09-30 10:47 UTCOSV refresh
Show 74 more
  1. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  2. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  3. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  4. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  5. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  6. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  7. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  8. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  9. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  10. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  11. 2026-09-11 17:40 UTCOSV refresh
  12. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  13. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  14. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  15. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  16. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  17. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  18. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.8% · 52nd percentile
  19. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.8% · 52nd percentile
  20. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.8% · 52nd percentile
  21. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.8% · 52nd percentile
  22. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.8% · 52nd percentile
  23. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.8% · 52nd percentile
  24. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.8% · 52nd percentile
  25. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.8% · 52nd percentile
  26. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.8% · 52nd percentile
  27. 2026-08-23 21:15 UTCEG score recompute
  28. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.8% · 52nd percentile
  29. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.8% · 52nd percentile
  30. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.8% · 52nd percentile
  31. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.8% · 52nd percentile
  32. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.8% · 52nd percentile
  33. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.8% · 52nd percentile
  34. 2026-08-17 13:06 UTCEG score recompute
  35. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.8% · 52nd percentile
  36. 2026-08-16 05:02 UTCEG score recompute
  37. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.8% · 52nd percentile
  38. 2026-08-15 02:15 UTCEG score recompute
  39. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.8% · 52nd percentile
  40. 2026-08-14 03:37 UTCEG score recompute
  41. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.8% · 52nd percentile
  42. 2026-08-12 17:14 UTCEG score recompute
  43. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.8% · 52nd percentile
  44. 2026-08-11 16:07 UTCEG score recompute
  45. 2026-08-11 13:43 UTCEPSS rescoreEPSS 0.8% · 52nd percentile
  46. 2026-08-11 01:39 UTCEG score recompute
  47. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.8% · 52nd percentile
  48. 2026-08-09 14:17 UTCEG score recompute
  49. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.8% · 51st percentile
  50. 2026-08-09 02:43 UTCEG score recompute
  51. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.8% · 52nd percentile
  52. 2026-08-07 18:54 UTCEG score recompute
  53. 2026-08-06 17:00 UTCEG score recompute
  54. 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.8% · 51st percentile
  55. 2026-08-05 22:28 UTCEG score recompute
  56. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.8% · 51st percentile
  57. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.8% · 51st percentile
  58. 2026-08-04 10:38 UTCEPSS rescoreEPSS 0.8% · 51st percentile
  59. 2026-08-03 20:01 UTCEG score recompute
  60. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.8% · 51st percentile
  61. 2026-08-02 05:23 UTCEG score recompute
  62. 2026-08-02 02:27 UTCEPSS rescoreEPSS 0.8% · 51st percentile
  63. 2026-08-01 04:16 UTCEPSS rescoreEPSS 0.8% · 51st percentile
  64. 2026-07-30 16:28 UTCEPSS rescoreEPSS 0.8% · 51st percentile
  65. 2026-07-30 01:30 UTCEPSS rescoreEPSS 0.8% · 51st percentile
  66. 2026-07-28 15:36 UTCEPSS rescoreEPSS 0.8% · 51st percentile
  67. 2026-07-27 14:13 UTCEPSS rescoreEPSS 0.8% · 51st percentile
  68. 2026-07-26 14:54 UTCEPSS rescoreEPSS 0.8% · 51st percentile
  69. 2026-07-25 14:18 UTCEPSS rescoreEPSS 0.8% · 51st percentile
  70. 2026-07-24 14:17 UTCEPSS rescoreEPSS 0.8% · 51st percentile
  71. 2026-07-23 14:18 UTCEPSS rescoreEPSS 0.8% · 51st percentile
  72. 2026-07-23 03:11 UTCEG score recompute
  73. 2026-07-22 14:08 UTCEPSS rescoreEPSS 0.8% · 51st percentile
  74. 2026-07-21 15:24 UTCEPSS rescoreEPSS 0.8% · 51st percentile

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Frequently asked(5)

What is CVE-2026-42238?
CVE-2026-42238 is a critical-severity vulnerability; its CVE record was published on May 4, 2026. Nginx UI is a web user interface for the Nginx web server. Prior to version 2.3.8, nginx-ui exposes a backup restore endpoint (POST /api/restore) that is completely unauthenticated during the first 10 minutes after process startup on any fresh installation. An unauthenticated remote attacker can…
When was the CVE record for CVE-2026-42238 published?
The CVE record for CVE-2026-42238 was published on May 4, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of May 6, 2026; the record at its source may have been updated since.
Is CVE-2026-42238 actively exploited?
CVE-2026-42238 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.8% probability of exploitation in the next 30 days (56th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-42238?
CVE-2026-42238 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-42238?
A fix for CVE-2026-42238 is available: update to the fixed version the vendor names in its advisory.

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