GHSA-xpp7-93x6-v29m

Source

https://github.com/advisories/GHSA-xpp7-93x6-v29m

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-xpp7-93x6-v29m/GHSA-xpp7-93x6-v29m.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-xpp7-93x6-v29m

Aliases

Published

2026-08-04T21:54:01Z

Modified

2026-08-04T22:00:24Z

Severity

7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H CVSS Calculator

Summary

XSS in Ghost's ActivityPub client

Details

Impact

The ActivityPub client in Ghost was vulnerable to JavaScript injection on posts shared by a maliciously customised ActivityPub server.

Vulnerable Versions

This vulnerability is present in the @tryghost/activitypub package up to v3.0.8. All prior versions are also affected.

Patches

@tryghost/activitypub v3.1.0 contains a fix for this issue and is also automatically fetched by Ghost.

References

Ghost thanks Brad Geesaman, Ghost Security for disclosing this vulnerability responsibly.

For more information

If you have any questions or comments about this advisory, email Ghost at security@ghost.org.

Database specific

{
    "cwe_ids":  [
        "CWE-79"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-08-04T21:54:01Z",
    "nvd_published_at":  "2026-06-24T19:17:12Z",
    "severity":  "HIGH"
}

References

Affected packages

npm / @tryghost/activitypub

Package

Name: @tryghost/activitypub; View open source insights on deps.dev
Purl: pkg:npm/%40tryghost/activitypub

Affected ranges

Type: SEMVER
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

3.1.0

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-xpp7-93x6-v29m/GHSA-xpp7-93x6-v29m.json"