CVE-2026-53944: tryghost ghost Incomplete List of Disallowed Inputs
CVSS: 5.8v3.1MediumDeferred
AliasesGHSA-wvp2-4qqp-4h3rBIT-ghost-2026-53944
Published 24-06-2026Last modified 24-06-2026
Vulnerability summary
CVE-2026-53944 is a medium (CVSS 5.8) Incomplete List of Disallowed Inputs vulnerability in tryghost ghost. EPSS estimates a 0.33% chance of exploitation in the next 30 days, higher than 24.6% of scored vulnerabilities.
CVSS score
5.8/10
010
Medium · v3.1 (CVE.org)EPSS score
0.33%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 24-06-2026PublishedVulnerability first disclosed.
- 24-06-2026Last modifiedVulnerability information updated.
Description
Ghost is a Node.js content management system. From 6.0.9 until 6.21.1, when making an external request, it is possible to bypass the IP filter that ensures the request isn't going to an internal service using an IPv6 literal which maps to a private IPv4 address. This vulnerability is fixed in 6.21.1.
CVSS metrics
3 scores · 3 sources · 1 versionMedium 5.8Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:NSourcesAll 3 agree
- OSV · NpmEcosystem advisory · calculated5.8MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
- NVDNIST5.8MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
EPSS trend
Probability
0.33%
Chance of exploitation in the next 30 days
Percentile
25%
Versus all other CVEs
30-day change
0.00 pp
From 0.33% on 21-09-2026
21-09-202621-10-2026
EPSS score0.33%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-184Incomplete List of Disallowed InputsThe product implements a protection mechanism that relies on a list of inputs (or properties of inputs) that are not allowed by policy or otherwise require other action to neutralize before additional processing takes place, but the list is incomplete.
- CWE-918Server-Side Request Forgery (SSRF)The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.
Affected systems
Npm1 product
- ghost≥ 6.0.9, < 6.21.1
Tryghost1 product
- ghost≥ 6.0.9, < 6.21.1
2 vendors · 2 products
References
6 links
- github.com/TryGhost/GhostPACKAGE