🛡️ CVE-2026-53949 — ghost

🟡 CVSS 5.3 — Medium ✅ No Known Exploit CWE-200 NVD
5.3
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Ghost Content API filter bypass reveals private fields

Impact

The validation applied to filters on the public API endpoints could be partially bypassed, making it possible to reveal private fields via a brute force attack. If SQLite was used as the database password hashes were fully accessible. If MySQL was used as the database the password hashes' case (uppercase / lowercase) would have been lost, which would likely have rendered a further brute force attack on the discovered hashes fruitless.

Vulnerable versions

This vulnerability is present in Ghost from v5.46.1 up to v6.21.1.

Patches

v6.21.2 contains a fix for this issue.

How to update

For self-hosters using Docker, find [Docker's official Ghost image here](https://hub.docker.com/_/ghost). Updating a Docker-based Ghost instance [is documented here](https://docs.ghost.org/install/docker#updating-ghost).

If your Ghost is a Ghost-CLI install see our documentation on [updating it to the latest version here](https://docs.ghost.org/update).

Workarounds

If upgrading immediately is not possible, block or filter requests to Content API endpoints where the filter query parameter contains password or email (including any compound form such as users.password, users.email, authors.password, authors.email). Reject requests at a reverse proxy / WAF layer before they reach Ghost.

Example (case-insensitive) pattern to block on the raw querystring:

```

filter=[^&]*(password|email)

```

References

Ghost thanks crnkovic for disclosing this vulnerability responsibly.

For more information

If you have any questions or comments about this advisory, email Ghost at [security@ghost.org](mailto:[email protected]).

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity none, availability none.

Weakness class

CVE-2026-53949 is classified as CWE-200: Exposure of Sensitive Information. Information that should stay internal is disclosed to someone who is not authorised to see it.

Affected software

CVE-2026-53949 is recorded against 2 packages.

  • ghost
  • unknown

Timeline and source

Published on 30 June 2026 and last revised on 5 August 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com (Web)
nvd.nist.gov (Web)

Details

Severity MEDIUM
CVSS Score 5.3
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE CWE-200
Public Exploit ✅ No
Source NVD
Published 2026-06-30
Updated 2026-08-12
Modified 2026-08-05
Fix URL N/A

Affected Packages

Software From version Fixed in
ghost — —
unknown — —

Similar Threats

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