Parse Server has a protected field change detection oracle via LiveQuery watch parameter

Description

An attacker can subscribe to LiveQuery with a watch parameter targeting a protected field. Although the protected field value is properly stripped from event payloads, the presence or absence of update events reveals whether the protected field changed, creating a binary oracle.

Recommendation

Update the parse-server package to the latest compatible version. Followings are version details:

• Affected version(s): **< 8.6.54

  >= 9.0.0, < 9.6.0-alpha.43**

• Patched version(s): **8.6.54

  9.6.0-alpha.43**

References

• GHSA-qpc3-fg4j-8hgm
• CVE-2026-33429
• CWE-203
• CAPEC-310
• OWASP 2021-A6

Related Issues

• Parse Server has a protected fields bypass via LiveQuery subscription WHERE clause - CVE-2026-32098
• Parse Server has a protected fields bypass via dot-notation in query and sort - CVE-2026-31872
• Parse Server has a stored XSS filter bypass via Content-Type MIME parameter and missing XML extension blocklist entries - CVE-2026-32728
• Parse Server has Regular Expression Denial of Service (ReDoS) via `$regex` query in LiveQuery - CVE-2026-30925

Tags:

npm

parse-server