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Medium

Member account takeover

  • Disclosed: 23.09.2021
  • Updated: 11.10.2026 10:22

Impact

An error in the implementation of the member email change functionality allows unauthenticated users to change the email address of arbitrary member accounts to one they control by crafting a request to the relevant API endpoint, and validating the new address via magic link sent to the new email address.

Ghost(Pro) has already been patched. Self-hosters are impacted if running Ghost a version between 3.18.0 and 4.15.0 with members functionality enabled.

Patches

Fixed in 4.15.1, all 4.x sites should upgrade as soon as possible. Fixed in 3.42.6, all 3.x sites should upgrade as soon as possible.

Workarounds

The patch in 4.15.1 and 3.42.6 adds a new authenticated endpoint for updating member email addresses. Updating Ghost is the quickest complete solution.

As a workaround, if for any reason you cannot update your Ghost instance, you can block the POST /members/api/send-magic-link/ endpoint, which will also disable member login and signup for your site.

For more information

If you have any questions or comments about this advisory:

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
npm package ghost >= 3.18.0, < 3.42.6, >= 4.0.0, < 4.15.1 3.42.6, 4.15.1

References

CVSS score 6.5/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Weakness (CWE)
-
Platform
npm
Package
ghost
Disclosed
23.09.2021
Updated
11.10.2026 10:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-65p7-pjj8-ggmr - CC BY 4.0

Vulnerability history: ghost

All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (61) in the archive
Total entries
61
First → latest
04.2021 10.2026
Without a fix
3
Exploited in attacks
0

Severity breakdown

  • Critical 4
  • High 16
  • Medium 38
  • Low 3

Disclosures per year

Severity:
  1. Member account takeover this entry
    Medium · 6.5 ghsa-65p7-pjj8-ggmr >= 3.18.0, < 3.42.6, >= 4.0.0, < 4.15.1 3.42.6, 4.15.1
  2. Ghost: Remote Code Execution via Bookmark Card Images
    High · 8.8 CVE-2026-105642 >= 6.56.0, < 6.67.0 6.67.0
  3. Ghost: Stored XSS via Embed Card Previews
    High · 7.3 CVE-2026-105643 >= 6.34.0, < 6.67.0 6.67.0
  4. Ghost: Stored XSS via SVG Uploads Bypassing Sanitization
    High · 7.3 CVE-2026-105649 >= 4.22.0, < 6.65.0 6.65.0
  5. Ghost: Stored XSS via oEmbed Photo Responses
    High · 8.1 CVE-2026-104414 >= 2.5.0, < 6.64.0 6.64.0
  6. Ghost: Stored XSS via Bookmark Card Images
    High · 7.3 CVE-2026-104413 >= 5.94.0, < 6.64.0 6.64.0
  7. Ghost: Invite Token Disclosure in Ghost Admin API
    High · 7.5 CVE-2026-104416 >= 4.39.0, < 6.64.0 6.64.0
  8. Ghost: Remote Code Execution via Theme Translation Files
    High · 7.2 CVE-2026-104418 >= 6.10.3, < 6.64.0 6.64.0
  9. Ghost: Stored XSS via File Uploads on Local Storage
    High · 7.3 CVE-2026-104411 >= 6.22.1, < 6.64.0 6.64.0
  10. Ghost: Cache-poisoning XSS in Ghost frontend via x-ghost-preview header
    Critical · 9.6 CVE-2026-53943 >= 4.0.0, < 6.37.0 6.37.0
  11. Ghost has incomplete CSRF protections around OTC use
    High · 7.5 CVE-2026-29784 >= 5.101.6, < 6.19.3 6.19.3
  12. Ghost Vulnerable to Remote Code Execution via Malicious Themes
    High · 7.6 CVE-2026-29053 >= 0.7.2, < 6.19.1 6.19.1
  13. Ghost has a SQL injection in Content API
    Critical · 9.4 CVE-2026-26980 >= 3.24.0, < 6.19.1 6.19.1
  14. Ghost vulnerable to XSS via malicious Portal preview links
    High · 8.8 CVE-2026-24778 >= 5.43.0, < 5.121.0, >= 6.0.0, < 6.15.0 5.121.0, 6.15.0
  15. Ghost has Staff Token permission bypass
    High · 8.1 CVE-2026-22595 >= 6.0.0, < 6.11.0, >= 5.105.0, < 5.130.6 6.11.0, 5.130.6
  16. Ghost has Staff 2FA bypass
    High · 8.1 CVE-2026-22594 >= 6.0.0, < 6.11.0, >= 5.105.0, < 5.130.6 6.11.0, 5.130.6
  17. Path Traversal in Ghost
    High · 7.5 CVE-2023-32235 < 5.42.1 5.42.1
  18. Ghost vulnerable to information disclosure of private API fields
    High · 7.5 CVE-2023-31133 < 5.46.1 5.46.1
  19. ghost vulnerable to unauthorized newsletter modification via improper access controls
    High · 8.5 CVE-2022-41654 >= 5.0.0, < 5.22.7, >= 4.46.0, < 4.48.8 5.22.7, 4.48.8
  20. Arbitrary file upload in Ghost
    Critical · 9.8 CVE-2022-27139 <= 4.39.0 no fix
  21. Arbitrary file upload in Ghost
    Critical · 9.8 CVE-2022-28397 <= 4.42.0 no fix

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