CVE-2026-53948

MEDIUMPre-NVD 5.45.4
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 5.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2% (12th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Trending — 3 sources updated this week
5.4EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 5.4Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Ghost is a Node.js content management system. From 6.19.4 until 6.21.1, insufficient validation of the client-supplied Content-Type on Ghost's Admin API file upload endpoint allowed uploaded files to be served from the site with an attacker-chosen content type on S3/GCS storage backends. On installations that serve uploaded files from the same origin as the site, this could have been used to facilitate stored cross-site scripting against site visitors or staff. This vulnerability is fixed in 6.21.1.

CVSS v3
5.4
EG Score
5.4MEDIUMmedium confidence
EG Risk
24
EG Risk 24/100

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)
Severity54% × 45%
The EG Score, 5.4 of 10.
Exploitation0.2% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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.
EPSS PROB
0.2%
EPSS %ILE
12th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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)60 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 partial (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

June 24, 2026

Last Modified

June 25, 2026

Advisory Details (1)

Auto-updated Jun 24, 2026
Patch available. Sources: github.
GitHub advisoryMentions a patch (unverified)

File Upload Content-Type Spoofing · Advisory · TryGhost/Ghost · GitHub

https://github.com/TryGhost/Ghost/security/advisories/GHSA-944x-pm95-3jpr

Vendor Advisories for CVE-2026-53948(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFix by version rangeDependents
ghost—
  • 6.19.4 up to 6.21.1: fixed in 6.21.1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 32× 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 100 of 138 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. None are among the latest 100 rows. The 38 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-14 01:24 UTCOSV refresh
  2. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  3. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  4. 2026-10-12 15:57 UTCEG score recompute
  5. 2026-10-11 19:40 UTCEG score recompute
  6. 2026-10-11 16:55 UTCEG score recompute
  7. 2026-10-11 14:18 UTCEG score recompute
  8. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  9. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  10. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  11. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  12. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  13. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  14. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  15. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  16. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  17. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  18. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  19. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  20. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  21. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  22. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  23. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  24. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  25. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.2% · 13th percentile
Show 75 more
  1. 2026-09-23 09:51 UTCEG score recompute
  2. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  3. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  4. 2026-09-18 07:47 UTCEG score recompute
  5. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  6. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  7. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  8. 2026-09-14 01:33 UTCEG score recompute
  9. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  10. 2026-09-12 16:06 UTCEG score recompute
  11. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  12. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  13. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  14. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  15. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  16. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  17. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  18. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  19. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  20. 2026-08-30 19:50 UTCEG score recompute
  21. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  22. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  23. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  24. 2026-08-28 03:00 UTCEG score recompute
  25. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  26. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  27. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  28. 2026-08-24 13:18 UTCEG score recompute
  29. 2026-08-23 10:56 UTCEG score recompute
  30. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  31. 2026-08-21 06:47 UTCEG score recompute
  32. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  33. 2026-08-20 07:14 UTCEG score recompute
  34. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  35. 2026-08-19 01:47 UTCEG score recompute
  36. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  37. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  38. 2026-08-16 20:09 UTCEG score recompute
  39. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  40. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  41. 2026-08-15 20:38 UTCEG score recompute
  42. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  43. 2026-08-14 21:06 UTCEG score recompute
  44. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  45. 2026-08-12 21:45 UTCEG score recompute
  46. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  47. 2026-08-11 22:14 UTCEG score recompute
  48. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  49. 2026-08-09 23:12 UTCEG score recompute
  50. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  51. 2026-08-08 23:41 UTCEG score recompute
  52. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  53. 2026-08-08 00:10 UTCEG score recompute
  54. 2026-08-07 00:38 UTCEG score recompute
  55. 2026-08-06 13:47 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  56. 2026-08-06 01:07 UTCEG score recompute
  57. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  58. 2026-08-05 01:37 UTCEG score recompute
  59. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  60. 2026-08-04 10:39 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  61. 2026-08-04 01:46 UTCEG score recompute
  62. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  63. 2026-08-02 02:44 UTCEG score recompute
  64. 2026-08-02 02:27 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  65. 2026-08-01 04:16 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  66. 2026-07-31 03:24 UTCEG score recompute
  67. 2026-07-30 16:28 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  68. 2026-07-30 02:09 UTCEG score recompute
  69. 2026-07-30 01:30 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  70. 2026-07-27 17:33 UTCEG score recompute
  71. 2026-07-26 15:23 UTCEG score recompute
  72. 2026-07-25 14:18 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  73. 2026-07-24 14:18 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  74. 2026-07-23 14:18 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  75. 2026-07-23 03:19 UTCEG score recompute

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-53948?
CVE-2026-53948 is a medium-severity vulnerability; its CVE record was published on June 24, 2026. Ghost is a Node.js content management system. From 6.19.4 until 6.21.1, insufficient validation of the client-supplied Content-Type on Ghost's Admin API file upload endpoint allowed uploaded files to be served from the site with an attacker-chosen content type on S3/GCS storage backends. On…
When was the CVE record for CVE-2026-53948 published?
The CVE record for CVE-2026-53948 was published on June 24, 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 June 25, 2026; the record at its source may have been updated since.
Is CVE-2026-53948 actively exploited?
CVE-2026-53948 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (12th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-53948?
CVE-2026-53948 has a CVSS base score of 5.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-53948?
A fix for CVE-2026-53948 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-53948 are linked in the Vendor Advisories panel on this page.

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