High severity · published Oct 1, 2026
CVE-2026-103277
Ghost 2.5.0 before 6.34.0 Untrusted Script Execution via oEmbed
8.1
CVSS
0.3%
EPSS
No
On KEV
Description
Ghost versions from 2.5.0 before 6.34.0 contain an untrusted script execution vulnerability in the oEmbed preview feature that fails to sandbox externally hosted scripts. Attackers can craft malicious oEmbed content to execute scripts in the context of a staff user's admin session, potentially compromising administrative access.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 20% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GH
Ghost · TryGhost
2.5.0 before 6.34.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-103277
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-103277
vendor-advisory
https://github.com/TryGhost/Ghost/security/advisories/GHSA-8vhf-xxpj-4qrg
third-party-advisory
https://www.vulncheck.com/advisories/ghost-2.5.0-before-6.34.0-untrusted-script-execution-via-oembed
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