CVE-2026-24778 is a high-severity (CVSS 8.8) Cross-site Scripting (XSS) vulnerability in ghost. A fix is available for ghost — see the affected versions and patch details below.
Ghost vulnerable to XSS via malicious Portal preview links
Exploitation Status
No confirmed exploitation observed yet
- A successful exploit gives an attacker total control of the affected component, not partial access.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2026-24778.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.
ghostnpm@tryghost/portalnpmDescription
Impact
An attacker was able to craft a malicious link that, when accessed by an authenticated staff user or member, would execute JavaScript with the victim's permissions, potentially leading to account takeover.
Vulnerable versions
This vulnerability is present in Ghost versions:
- v5.43.0 to v5.120.4
- v6.0.0 to v6.14.0
As well as in Portal versions:
- v2.29.1 to v2.51.4
- v2.52.0 to v2.57.0
Patches
Ghost automatically loads the latest patch of the members Portal component via CDN. Therefore:
- For Ghost 5.x users, upgrading to v5.121.0 or later fixes the vulnerability (loads Portal v2.51.5, which contains the patch)
- For Ghost 6.x users, upgrading to v6.15.0 or later fixes the vulnerability (loads Portal v2.57.1, which contains the patch)
For Ghost installations using a customised or self-hosted version of Portal, it will be necessary to manually rebuild from or update to the latest patch version.
References
Ghost thanks Younes Belalia for discovering and disclosing this vulnerability responsibly.
For more information
If users have any questions or comments about this advisory, email Ghost at [email protected].
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | ghost | ≥ 5.43.0&&< 5.121.0 | 5.121.0npm install ghost@5.121.0 |
| 📦npm | @tryghost/portal | ≥ 2.29.1&&< 2.51.5 | 2.51.5npm install @tryghost/portal@2.51.5 |
| 📦npm | @tryghost/portal | ≥ 2.52.0&&< 2.57.1 | 2.57.1npm install @tryghost/portal@2.57.1 |
| 📦npm | ghost | ≥ 6.0.0&&< 6.15.0 | 6.15.0npm install ghost@6.15.0 |
Affected Products
ghostghostportalghostDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for ghost, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update ghost to 5.121.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-24778 is resolved across your whole dependency graph.
Workarounds
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.
Frequently Asked Questions
Is CVE-2026-24778 in your dependencies?
Find it across npm, including transitive dependencies.