CVE-2026-53950

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 90% 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, secondary
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.5Exploit: NoneExposed: 0

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

@tryghost/activitypub is Ghost’s social/federation client app. Prior to 3.1.0, the ActivityPub client in Ghost was vulnerable to JavaScript injection on posts shared by a maliciously customised ActivityPub server. This vulnerability is fixed in 3.1.0.

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
10.5%
KEV
Not listed

Published

June 24, 2026

Last Modified

June 25, 2026

Advisory Details (1)

Auto-updated Jun 24, 2026
Patch available. Sources: github.
github Patch Available

XSS in Ghost's ActivityPub client · Advisory · TryGhost/Ghost · GitHub

https://github.com/TryGhost/Ghost/security/advisories/GHSA-xpp7-93x6-v29m

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 23× in last 7d / 74× 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.

  1. 2026-07-16 00:19 UTCEG score recompute
  2. 2026-07-15 12:39 UTCEG score recompute
  3. 2026-07-15 02:00 UTCEPSS rescore
  4. 2026-07-15 02:00 UTCEPSS rescore
  5. 2026-07-15 00:56 UTCEG score recompute
  6. 2026-07-14 13:16 UTCEG score recompute
  7. 2026-07-14 01:36 UTCEG score recompute
  8. 2026-07-13 22:31 UTCEPSS rescore
  9. 2026-07-13 13:56 UTCEG score recompute
  10. 2026-07-13 06:13 UTCEPSS rescore
  11. 2026-07-13 06:13 UTCEPSS rescore
  12. 2026-07-13 02:13 UTCEG score recompute
  13. 2026-07-12 14:32 UTCEG score recompute
  14. 2026-07-12 05:46 UTCEPSS rescore
  15. 2026-07-12 02:52 UTCEG score recompute
  16. 2026-07-11 15:12 UTCEG score recompute
  17. 2026-07-11 03:30 UTCEG score recompute
  18. 2026-07-10 15:47 UTCEG score recompute
  19. 2026-07-10 03:46 UTCEG score recompute
  20. 2026-07-09 19:10 UTCEPSS rescore
  21. 2026-07-09 19:10 UTCEPSS rescore
  22. 2026-07-09 16:05 UTCEG score recompute
  23. 2026-07-09 04:22 UTCEG score recompute
  24. 2026-07-08 16:37 UTCEG score recompute
  25. 2026-07-08 15:16 UTCEPSS rescore
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  1. 2026-07-08 15:16 UTCEPSS rescore
  2. 2026-07-08 04:57 UTCEG score recompute
  3. 2026-07-07 16:53 UTCEG score recompute
  4. 2026-07-07 13:46 UTCEPSS rescore
  5. 2026-07-07 13:46 UTCEPSS rescore
  6. 2026-07-07 04:21 UTCEG score recompute
  7. 2026-07-06 16:36 UTCEG score recompute
  8. 2026-07-06 16:27 UTCEPSS rescore
  9. 2026-07-06 16:27 UTCEPSS rescore
  10. 2026-07-06 04:55 UTCEG score recompute
  11. 2026-07-06 02:23 UTCEPSS rescore
  12. 2026-07-06 02:23 UTCEPSS rescore
  13. 2026-07-05 16:59 UTCEG score recompute
  14. 2026-07-05 05:19 UTCEG score recompute
  15. 2026-07-05 02:31 UTCEPSS rescore
  16. 2026-07-05 02:30 UTCEPSS rescore
  17. 2026-07-04 17:39 UTCEG score recompute
  18. 2026-07-04 06:31 UTCEPSS rescore
  19. 2026-07-04 06:31 UTCEPSS rescore
  20. 2026-07-04 05:57 UTCEG score recompute
  21. 2026-07-03 18:12 UTCEG score recompute
  22. 2026-07-03 06:29 UTCEG score recompute
  23. 2026-07-02 18:49 UTCEG score recompute
  24. 2026-07-02 07:10 UTCEG score recompute
  25. 2026-07-01 19:28 UTCEG score recompute
  26. 2026-07-01 15:07 UTCEPSS rescore
  27. 2026-07-01 07:47 UTCEG score recompute
  28. 2026-06-30 23:22 UTCEPSS rescore
  29. 2026-06-30 20:07 UTCEG score recompute
  30. 2026-06-30 08:27 UTCEG score recompute
  31. 2026-06-29 20:47 UTCEG score recompute
  32. 2026-06-29 14:06 UTCEPSS rescore
  33. 2026-06-29 14:06 UTCEPSS rescore
  34. 2026-06-29 09:05 UTCEG score recompute
  35. 2026-06-28 21:25 UTCEG score recompute
  36. 2026-06-28 14:07 UTCEPSS rescore
  37. 2026-06-28 09:44 UTCEG score recompute
  38. 2026-06-28 04:56 UTCEPSS rescore
  39. 2026-06-28 04:56 UTCEPSS rescore
  40. 2026-06-27 22:04 UTCEG score recompute
  41. 2026-06-27 10:24 UTCEG score recompute
  42. 2026-06-27 03:08 UTCEPSS rescore
  43. 2026-06-26 22:43 UTCEG score recompute
  44. 2026-06-26 11:00 UTCEG score recompute
  45. 2026-06-25 19:26 UTCEG score recompute
  46. 2026-06-25 13:49 UTCEPSS rescore
  47. 2026-06-25 07:45 UTCEG score recompute
  48. 2026-06-24 20:05 UTCEG score recompute
  49. 2026-06-24 20:03 UTCNVD updatefirst tracked

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Frequently asked(5)

What is CVE-2026-53950?
CVE-2026-53950 is a high vulnerability published on June 24, 2026. @tryghost/activitypub is Ghost’s social/federation client app. Prior to 3.1.0, the ActivityPub client in Ghost was vulnerable to JavaScript injection on posts shared by a maliciously customised ActivityPub server. This vulnerability is fixed in 3.1.0.
When was CVE-2026-53950 disclosed?
CVE-2026-53950 was first published in the National Vulnerability Database on June 24, 2026, with the most recent update on June 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-53950 actively exploited?
CVE-2026-53950 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 10.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-53950?
CVE-2026-53950 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-53950?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53950, 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.

Dependency Blast Radius

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