CVE-2018-25350

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-05-26. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this weekElevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: Elevated riskExposed: 0

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

userSpice 4.3.24 contains a username enumeration vulnerability that allows unauthenticated attackers to discover valid usernames by sending POST requests to the existingUsernameCheck.php endpoint. Attackers can submit usernames and analyze response text for the 'taken' string to identify existing accounts in the system.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
75(Attend)
EG Risk 75/100SSVC: Attend

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
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
35%
KEV
Not listed

Published

May 26, 2026

Last Modified

July 23, 2026

Advisory Details (2)

Auto-updated Jul 25, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

userSpice 4.3.24 Username Enumeration via existingUsernameCheck.php | Advisories | VulnCheck

https://www.vulncheck.com/advisories/userspice-username-enumeration-via-existingusernamecheck-php
generic🟡 PoC Available

userSpice 4.3.24 - Username Enumeration - PHP webapps Exploit

https://www.exploit-db.com/exploits/44872

Vendor Advisories for CVE-2018-25350(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 14× in last 7d / 57× 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.

Showing the most recent 100 of 223 total refreshes for this CVE.

  1. 2026-07-26 14:51 UTCEPSS rescore
  2. 2026-07-26 14:51 UTCEPSS rescore
  3. 2026-07-26 07:48 UTCEG score recompute
  4. 2026-07-26 07:48 UTCGHSA enrichment
  5. 2026-07-25 14:14 UTCEPSS rescore
  6. 2026-07-24 14:14 UTCEPSS rescore
  7. 2026-07-24 14:14 UTCEPSS rescore
  8. 2026-07-23 14:15 UTCEPSS rescore
  9. 2026-07-23 01:36 UTCEG score recompute
  10. 2026-07-22 22:16 UTCEG score recompute
  11. 2026-07-22 14:05 UTCEPSS rescore
  12. 2026-07-21 15:22 UTCEPSS rescore
  13. 2026-07-20 17:04 UTCEPSS rescore
  14. 2026-07-20 17:04 UTCEPSS rescore
  15. 2026-07-19 14:28 UTCEPSS rescore
  16. 2026-07-19 02:26 UTCEPSS rescore
  17. 2026-07-19 02:26 UTCEPSS rescore
  18. 2026-07-16 16:59 UTCEPSS rescore
  19. 2026-07-16 16:59 UTCEPSS rescore
  20. 2026-07-15 16:55 UTCEPSS rescore
  21. 2026-07-15 16:55 UTCEPSS rescore
  22. 2026-07-15 01:56 UTCEPSS rescore
  23. 2026-07-15 01:56 UTCEPSS rescore
  24. 2026-07-13 22:27 UTCEPSS rescore
  25. 2026-07-13 22:26 UTCEPSS rescore
Show 75 more
  1. 2026-07-13 06:10 UTCEPSS rescore
  2. 2026-07-12 05:43 UTCEPSS rescore
  3. 2026-07-11 08:24 UTCEPSS rescore
  4. 2026-07-09 19:06 UTCEPSS rescore
  5. 2026-07-08 15:11 UTCEPSS rescore
  6. 2026-07-07 13:42 UTCEPSS rescore
  7. 2026-07-07 13:42 UTCEPSS rescore
  8. 2026-07-06 16:24 UTCEPSS rescore
  9. 2026-07-06 16:24 UTCEPSS rescore
  10. 2026-07-06 02:20 UTCEPSS rescore
  11. 2026-07-05 02:27 UTCEPSS rescore
  12. 2026-07-04 06:28 UTCEPSS rescore
  13. 2026-07-04 06:28 UTCEPSS rescore
  14. 2026-07-02 16:54 UTCEPSS rescore
  15. 2026-07-01 15:03 UTCEPSS rescore
  16. 2026-07-01 15:03 UTCEPSS rescore
  17. 2026-07-01 14:10 UTCGHSA enrichment
  18. 2026-06-30 23:20 UTCEPSS rescore
  19. 2026-06-30 23:19 UTCEPSS rescore
  20. 2026-06-29 19:53 UTCGHSA enrichment
  21. 2026-06-29 14:59 UTCGHSA enrichment
  22. 2026-06-29 14:03 UTCEPSS rescore
  23. 2026-06-28 23:44 UTCGHSA enrichment
  24. 2026-06-28 14:04 UTCEPSS rescore
  25. 2026-06-28 11:25 UTCGHSA enrichment
  26. 2026-06-28 07:33 UTCGHSA enrichment
  27. 2026-06-28 04:53 UTCEPSS rescore
  28. 2026-06-28 04:53 UTCEPSS rescore
  29. 2026-06-28 02:42 UTCGHSA enrichment
  30. 2026-06-27 22:50 UTCGHSA enrichment
  31. 2026-06-27 18:59 UTCGHSA enrichment
  32. 2026-06-27 15:01 UTCGHSA enrichment
  33. 2026-06-27 11:08 UTCGHSA enrichment
  34. 2026-06-27 07:07 UTCGHSA enrichment
  35. 2026-06-27 03:06 UTCEPSS rescore
  36. 2026-06-27 03:06 UTCEPSS rescore
  37. 2026-06-26 21:54 UTCGHSA enrichment
  38. 2026-06-26 18:02 UTCGHSA enrichment
  39. 2026-06-26 02:52 UTCGHSA enrichment
  40. 2026-06-25 20:08 UTCGHSA enrichment
  41. 2026-06-25 16:06 UTCGHSA enrichment
  42. 2026-06-25 13:47 UTCEPSS rescore
  43. 2026-06-25 13:47 UTCEPSS rescore
  44. 2026-06-25 12:04 UTCGHSA enrichment
  45. 2026-06-24 14:02 UTCEPSS rescore
  46. 2026-06-24 14:02 UTCEPSS rescore
  47. 2026-06-23 21:30 UTCEPSS rescore
  48. 2026-06-23 21:30 UTCEPSS rescore
  49. 2026-06-23 21:30 UTCEPSS rescore
  50. 2026-06-22 14:23 UTCEPSS rescore
  51. 2026-06-21 14:54 UTCEPSS rescore
  52. 2026-06-21 14:54 UTCEPSS rescore
  53. 2026-06-21 01:57 UTCEPSS rescore
  54. 2026-06-21 01:57 UTCEPSS rescore
  55. 2026-06-19 19:23 UTCEPSS rescore
  56. 2026-06-19 19:23 UTCEPSS rescore
  57. 2026-06-18 17:50 UTCEPSS rescore
  58. 2026-06-18 17:50 UTCEPSS rescore
  59. 2026-06-18 03:41 UTCGHSA enrichment
  60. 2026-06-17 23:11 UTCGHSA enrichment
  61. 2026-06-17 19:21 UTCGHSA enrichment
  62. 2026-06-17 17:50 UTCEPSS rescore
  63. 2026-06-17 17:50 UTCEPSS rescore
  64. 2026-06-17 13:51 UTCGHSA enrichment
  65. 2026-06-17 09:57 UTCGHSA enrichment
  66. 2026-06-17 04:55 UTCGHSA enrichment
  67. 2026-06-17 01:04 UTCGHSA enrichment
  68. 2026-06-16 21:13 UTCGHSA enrichment
  69. 2026-06-16 17:50 UTCEPSS rescore
  70. 2026-06-16 17:50 UTCEPSS rescore
  71. 2026-06-16 17:20 UTCGHSA enrichment
  72. 2026-06-16 10:24 UTCGHSA enrichment
  73. 2026-06-16 06:27 UTCGHSA enrichment
  74. 2026-06-16 02:23 UTCGHSA enrichment
  75. 2026-06-15 22:31 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2018-25350?
CVE-2018-25350 is a critical vulnerability published on May 26, 2026. userSpice 4.3.24 contains a username enumeration vulnerability that allows unauthenticated attackers to discover valid usernames by sending POST requests to the existingUsernameCheck.php endpoint. Attackers can submit usernames and analyze response text for the 'taken' string to identify existing…
When was CVE-2018-25350 disclosed?
CVE-2018-25350 was first published in the National Vulnerability Database on May 26, 2026, with the most recent update on July 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-25350 actively exploited?
CVE-2018-25350 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 64.5% of all scored CVEs.
What is the CVSS score of CVE-2018-25350?
CVE-2018-25350 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2018-25350?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-25350, 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.

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