CVE-2026-49103

CRITICALNVD 9.49.4—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.4 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 78% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.4
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.4Exploit: NoneExposed: 0

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

Webmin before 2.640 does not safely construct a filename for saving of an attachment within the mailboxes component. This occurs in mailboxes/detachall.cgi.

CVSS v3
9.4
EG Score
9.4(medium)
EPSS
22.5%
KEV
Not listed

Published

May 27, 2026

Last Modified

May 27, 2026

Advisory Details (2)

Auto-updated May 28, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

Comparing 2.630...2.640 · webmin/webmin · GitHub

https://github.com/webmin/webmin/compare/2.630...2.640
github_commit

commit cf432879a145 (webmin/webmin)

Fix landed in webmin/webmin commit cf432879a145 — awaiting tagged release

https://github.com/webmin/webmin/commit/cf432879a14568c4bb44cd2f9e5a9bd0e168edc1

Vendor Advisories for CVE-2026-49103(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 8× in last 7d / 60× 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 205 total refreshes for this CVE.

  1. 2026-07-22 14:08 UTCEPSS rescore
  2. 2026-07-21 15:25 UTCEPSS rescore
  3. 2026-07-20 17:08 UTCEPSS rescore
  4. 2026-07-19 14:31 UTCEPSS rescore
  5. 2026-07-19 14:31 UTCEPSS rescore
  6. 2026-07-19 02:29 UTCEPSS rescore
  7. 2026-07-18 10:04 UTCEPSS rescore
  8. 2026-07-16 17:03 UTCEPSS rescore
  9. 2026-07-15 16:57 UTCEPSS rescore
  10. 2026-07-15 02:00 UTCEPSS rescore
  11. 2026-07-13 22:30 UTCEPSS rescore
  12. 2026-07-13 06:13 UTCEPSS rescore
  13. 2026-07-12 05:46 UTCEPSS rescore
  14. 2026-07-11 23:19 UTCGHSA enrichment
  15. 2026-07-11 08:27 UTCEPSS rescore
  16. 2026-07-09 19:10 UTCEPSS rescore
  17. 2026-07-08 23:45 UTCGHSA enrichment
  18. 2026-07-08 15:16 UTCEPSS rescore
  19. 2026-07-07 13:46 UTCEPSS rescore
  20. 2026-07-06 16:27 UTCEPSS rescore
  21. 2026-07-06 02:23 UTCEPSS rescore
  22. 2026-07-05 02:30 UTCEPSS rescore
  23. 2026-07-04 06:31 UTCEPSS rescore
  24. 2026-07-01 15:07 UTCEPSS rescore
  25. 2026-07-01 14:06 UTCGHSA enrichment
Show 75 more
  1. 2026-07-01 09:33 UTCGHSA enrichment
  2. 2026-06-30 23:22 UTCEPSS rescore
  3. 2026-06-30 09:13 UTCGHSA enrichment
  4. 2026-06-30 03:13 UTCGHSA enrichment
  5. 2026-06-29 19:47 UTCGHSA enrichment
  6. 2026-06-29 14:07 UTCGHSA enrichment
  7. 2026-06-29 14:06 UTCEPSS rescore
  8. 2026-06-29 14:06 UTCEPSS rescore
  9. 2026-06-29 00:48 UTCGHSA enrichment
  10. 2026-06-28 20:41 UTCGHSA enrichment
  11. 2026-06-28 16:37 UTCGHSA enrichment
  12. 2026-06-28 14:07 UTCEPSS rescore
  13. 2026-06-28 10:44 UTCGHSA enrichment
  14. 2026-06-28 06:40 UTCGHSA enrichment
  15. 2026-06-28 04:56 UTCEPSS rescore
  16. 2026-06-28 04:56 UTCEPSS rescore
  17. 2026-06-28 02:38 UTCGHSA enrichment
  18. 2026-06-27 22:26 UTCGHSA enrichment
  19. 2026-06-27 18:25 UTCGHSA enrichment
  20. 2026-06-27 13:50 UTCGHSA enrichment
  21. 2026-06-27 09:46 UTCGHSA enrichment
  22. 2026-06-27 05:44 UTCGHSA enrichment
  23. 2026-06-27 03:08 UTCEPSS rescore
  24. 2026-06-26 21:03 UTCGHSA enrichment
  25. 2026-06-26 17:03 UTCGHSA enrichment
  26. 2026-06-26 02:23 UTCGHSA enrichment
  27. 2026-06-25 20:55 UTCGHSA enrichment
  28. 2026-06-25 16:54 UTCGHSA enrichment
  29. 2026-06-25 13:49 UTCEPSS rescore
  30. 2026-06-25 12:54 UTCGHSA enrichment
  31. 2026-06-25 08:53 UTCGHSA enrichment
  32. 2026-06-25 00:28 UTCGHSA enrichment
  33. 2026-06-24 14:05 UTCEPSS rescore
  34. 2026-06-23 21:33 UTCEPSS rescore
  35. 2026-06-23 21:33 UTCEPSS rescore
  36. 2026-06-22 14:25 UTCEPSS rescore
  37. 2026-06-22 14:25 UTCEPSS rescore
  38. 2026-06-21 14:56 UTCEPSS rescore
  39. 2026-06-21 14:56 UTCEPSS rescore
  40. 2026-06-21 01:59 UTCEPSS rescore
  41. 2026-06-21 01:59 UTCEPSS rescore
  42. 2026-06-19 19:26 UTCEPSS rescore
  43. 2026-06-19 19:26 UTCEPSS rescore
  44. 2026-06-18 17:52 UTCEPSS rescore
  45. 2026-06-18 17:52 UTCEPSS rescore
  46. 2026-06-18 02:40 UTCGHSA enrichment
  47. 2026-06-17 22:38 UTCGHSA enrichment
  48. 2026-06-17 18:37 UTCGHSA enrichment
  49. 2026-06-17 17:53 UTCEPSS rescore
  50. 2026-06-17 12:33 UTCGHSA enrichment
  51. 2026-06-17 08:07 UTCGHSA enrichment
  52. 2026-06-17 04:04 UTCGHSA enrichment
  53. 2026-06-17 00:03 UTCGHSA enrichment
  54. 2026-06-16 20:02 UTCGHSA enrichment
  55. 2026-06-16 17:53 UTCEPSS rescore
  56. 2026-06-16 16:02 UTCGHSA enrichment
  57. 2026-06-16 10:26 UTCGHSA enrichment
  58. 2026-06-16 06:25 UTCGHSA enrichment
  59. 2026-06-16 02:16 UTCGHSA enrichment
  60. 2026-06-15 22:16 UTCGHSA enrichment
  61. 2026-06-15 17:49 UTCEPSS rescore
  62. 2026-06-15 17:49 UTCEPSS rescore
  63. 2026-06-15 13:26 UTCGHSA enrichment
  64. 2026-06-15 04:57 UTCGHSA enrichment
  65. 2026-06-15 00:56 UTCGHSA enrichment
  66. 2026-06-14 23:18 UTCEPSS rescore
  67. 2026-06-14 20:54 UTCGHSA enrichment
  68. 2026-06-14 16:53 UTCGHSA enrichment
  69. 2026-06-14 12:52 UTCGHSA enrichment
  70. 2026-06-14 08:52 UTCGHSA enrichment
  71. 2026-06-14 04:51 UTCGHSA enrichment
  72. 2026-06-14 00:40 UTCGHSA enrichment
  73. 2026-06-13 23:00 UTCEPSS rescore
  74. 2026-06-13 20:35 UTCGHSA enrichment
  75. 2026-06-13 11:54 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-49103?
CVE-2026-49103 is a critical vulnerability published on May 27, 2026. Webmin before 2.640 does not safely construct a filename for saving of an attachment within the mailboxes component. This occurs in mailboxes/detachall.cgi.
When was CVE-2026-49103 disclosed?
CVE-2026-49103 was first published in the National Vulnerability Database on May 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-49103 actively exploited?
CVE-2026-49103 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 22.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-49103?
CVE-2026-49103 has a CVSS v3 base score of 9.4 (NVD).
How do I remediate CVE-2026-49103?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-49103, 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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