Ghost 2.5.0 before 6.34.0 Untrusted Script Execution via oEmbed (CVE-2026-103277) | HOL Guard CVE

High · CVSS 8.6CVE-2026-103277

Ghost 2.5.0 before 6.34.0 Untrusted Script Execution via oEmbed

Answer in brief

CVE-2026-103277 records a High severity (CVSS 8.6) vulnerability in Ghost 2.5.0 before 6.34.0 Untrusted Script Execution via oEmbed. The current sources do not mark it as known exploited. The current feed maps TryGhost/Ghost (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 1, 2026Updated Oct 1, 2026Source checked Oct 1, 2026First seen by HOL Oct 1, 2026Material review Oct 1, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.6
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 8.6. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps TryGhost/Ghost (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
TryGhost/Ghostgeneric	>=2.5.0 <6.34.0	6.34.0

Recommended response

Check inventory. Check lockfiles and deployed manifests for TryGhost/Ghost.
Review the reported fix. Update TryGhost/Ghost to 6.34.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Oct 1, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 1, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Oct 1, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.