CVE-2026-103277

high

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.

References

https://www.vulncheck.com/advisories/ghost-2.5.0-before-6.34.0-untrusted-script-execution-via-oembed

https://github.com/TryGhost/Ghost/security/advisories/GHSA-8vhf-xxpj-4qrg

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-90670

Details

Source: Mitre, NVD

Published: 2026-10-01

Updated: 2026-10-01

Risk Information

CVSS v2

Base Score: 9.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:N

Severity: High

CVSS v3

Base Score: 8.1

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Severity: High

CVSS v4

Base Score: 8.6

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Severity: High

EPSS

EPSS: 0.00273