CVE-2026-33538
Unauthenticated DoS in Parse Server via unconfigured provider requests
Is CVE-2026-33538 being exploited?
Not confirmed. CVE-2026-33538 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.41% probability of exploitation in the next 30 days.
How severe is CVE-2026-33538?
CVE-2026-33538 is rated High with a CVSS score of 8.7. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-33538?
Yes. A fix has been recorded for CVE-2026-33538. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-33538 affect?
CVE-2026-33538 affects Parse Server (<8.6.58), Parse Server (<9.6.0-alpha.52). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-33538?
Upgrade to 8.6.58 or 9.6.0-alpha.52
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated DoS: unconfigured provider requests trigger full user DB scans, potentially saturating DB resources.
Patch when possible
- affected< 8.6.58
- affected>= 9.0.0 and < 9.6.0-alpha.52
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.