CVE-2026-49103

CRITICALNVD 9.49.4—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.4 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 67% 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
Trending — 4 sources updated this week
9.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.4Exploit: None knownExposed: 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)
EG Risk
42(Track)
EG Risk 42/100SSVC: Track

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
Severity94% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
33%
KEV
Not listed

Published

May 27, 2026

Last Modified

May 27, 2026

Advisory Details (2)

Auto-updated Sep 15, 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 7× in last 7d / 42× 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 359 total refreshes for this CVE.

  1. 2026-09-16 05:15 UTCEPSS rescore
  2. 2026-09-14 07:38 UTCEG score recompute
  3. 2026-09-14 07:38 UTCGHSA enrichment
  4. 2026-09-13 16:47 UTCEPSS rescore
  5. 2026-09-13 03:09 UTCOSV refresh
  6. 2026-09-11 14:53 UTCEPSS rescore
  7. 2026-09-10 09:35 UTCEPSS rescore
  8. 2026-09-08 22:01 UTCEPSS rescore
  9. 2026-09-07 16:01 UTCEPSS rescore
  10. 2026-09-06 13:47 UTCEPSS rescore
  11. 2026-09-04 05:06 UTCEPSS rescore
  12. 2026-09-02 14:12 UTCEPSS rescore
  13. 2026-09-01 13:54 UTCEPSS rescore
  14. 2026-09-01 04:40 UTCEPSS rescore
  15. 2026-08-30 19:17 UTCEPSS rescore
  16. 2026-08-30 01:22 UTCEPSS rescore
  17. 2026-08-28 21:41 UTCEPSS rescore
  18. 2026-08-27 14:25 UTCEPSS rescore
  19. 2026-08-26 14:46 UTCEPSS rescore
  20. 2026-08-25 13:49 UTCEPSS rescore
  21. 2026-08-25 05:15 UTCEG score recompute
  22. 2026-08-25 05:15 UTCGHSA enrichment
  23. 2026-08-23 23:57 UTCGHSA enrichment
  24. 2026-08-23 19:00 UTCGHSA enrichment
  25. 2026-08-23 14:59 UTCEG score recompute
Show 75 more
  1. 2026-08-23 14:59 UTCGHSA enrichment
  2. 2026-08-23 00:19 UTCEPSS rescore
  3. 2026-08-22 00:39 UTCEG score recompute
  4. 2026-08-22 00:39 UTCGHSA enrichment
  5. 2026-08-21 23:49 UTCEPSS rescore
  6. 2026-08-21 20:33 UTCGHSA enrichment
  7. 2026-08-21 01:40 UTCEG score recompute
  8. 2026-08-21 01:40 UTCGHSA enrichment
  9. 2026-08-20 22:55 UTCEPSS rescore
  10. 2026-08-20 21:40 UTCGHSA enrichment
  11. 2026-08-20 17:39 UTCGHSA enrichment
  12. 2026-08-20 11:17 UTCEG score recompute
  13. 2026-08-20 11:17 UTCGHSA enrichment
  14. 2026-08-19 17:04 UTCEPSS rescore
  15. 2026-08-18 13:48 UTCEPSS rescore
  16. 2026-08-17 13:47 UTCEPSS rescore
  17. 2026-08-17 13:15 UTCGHSA enrichment
  18. 2026-08-17 09:15 UTCGHSA enrichment
  19. 2026-08-16 15:14 UTCEG score recompute
  20. 2026-08-16 15:14 UTCGHSA enrichment
  21. 2026-08-16 14:56 UTCEPSS rescore
  22. 2026-08-16 10:48 UTCGHSA enrichment
  23. 2026-08-16 06:48 UTCGHSA enrichment
  24. 2026-08-16 02:48 UTCEG score recompute
  25. 2026-08-16 02:48 UTCGHSA enrichment
  26. 2026-08-16 02:14 UTCEPSS rescore
  27. 2026-08-15 02:16 UTCEG score recompute
  28. 2026-08-15 02:16 UTCGHSA enrichment
  29. 2026-08-15 01:30 UTCEPSS rescore
  30. 2026-08-14 22:16 UTCGHSA enrichment
  31. 2026-08-14 17:58 UTCGHSA enrichment
  32. 2026-08-14 13:30 UTCGHSA enrichment
  33. 2026-08-14 09:26 UTCGHSA enrichment
  34. 2026-08-14 05:26 UTCGHSA enrichment
  35. 2026-08-14 01:25 UTCEG score recompute
  36. 2026-08-14 01:25 UTCGHSA enrichment
  37. 2026-08-13 22:00 UTCEPSS rescore
  38. 2026-08-13 09:54 UTCGHSA enrichment
  39. 2026-08-13 05:54 UTCGHSA enrichment
  40. 2026-08-13 01:54 UTCGHSA enrichment
  41. 2026-08-12 21:54 UTCGHSA enrichment
  42. 2026-08-12 17:53 UTCGHSA enrichment
  43. 2026-08-12 13:53 UTCEG score recompute
  44. 2026-08-12 13:53 UTCGHSA enrichment
  45. 2026-08-12 13:51 UTCEPSS rescore
  46. 2026-08-12 09:31 UTCGHSA enrichment
  47. 2026-08-12 02:32 UTCGHSA enrichment
  48. 2026-08-11 22:31 UTCGHSA enrichment
  49. 2026-08-11 18:30 UTCEG score recompute
  50. 2026-08-11 18:30 UTCGHSA enrichment
  51. 2026-08-11 13:34 UTCGHSA enrichment
  52. 2026-08-11 08:13 UTCGHSA enrichment
  53. 2026-08-11 04:11 UTCGHSA enrichment
  54. 2026-08-11 00:11 UTCEG score recompute
  55. 2026-08-11 00:11 UTCGHSA enrichment
  56. 2026-08-11 00:00 UTCEPSS rescore
  57. 2026-08-10 13:34 UTCGHSA enrichment
  58. 2026-08-10 09:24 UTCGHSA enrichment
  59. 2026-08-10 05:24 UTCGHSA enrichment
  60. 2026-08-10 01:23 UTCGHSA enrichment
  61. 2026-08-09 21:23 UTCGHSA enrichment
  62. 2026-08-09 17:22 UTCEG score recompute
  63. 2026-08-09 17:22 UTCGHSA enrichment
  64. 2026-08-09 13:46 UTCEPSS rescore
  65. 2026-08-09 13:22 UTCGHSA enrichment
  66. 2026-08-09 09:22 UTCGHSA enrichment
  67. 2026-08-09 05:20 UTCGHSA enrichment
  68. 2026-08-09 01:20 UTCGHSA enrichment
  69. 2026-08-08 21:17 UTCEG score recompute
  70. 2026-08-08 21:17 UTCGHSA enrichment
  71. 2026-08-08 16:37 UTCEPSS rescore
  72. 2026-08-08 13:01 UTCGHSA enrichment
  73. 2026-08-08 09:01 UTCGHSA enrichment
  74. 2026-08-08 05:00 UTCGHSA enrichment
  75. 2026-08-08 01:00 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 0% probability of exploitation in the next 30 days, which ranks it in the top 66.7% of all scored CVEs.
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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