CVE-2026-42560
Patreon OAuth maps all Patreon users to the same local ID.
Is CVE-2026-42560 being exploited?
Not confirmed. CVE-2026-42560 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 0.42% probability of exploitation in the next 30 days.
How severe is CVE-2026-42560?
CVE-2026-42560 is rated Critical with a CVSS score of 9.1. 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-2026-42560?
Yes. A fix has been recorded for CVE-2026-42560. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-42560 affect?
CVE-2026-42560 affects Patreon OAuth provider library (versions 1.18.0–1.25.1, 2.0.0–2.1.1). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-42560?
Upgrade to 1.25.2 or 2.1.2+, audit identity handling.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Cross-account access and data leakage: stable token.User.ID key can merge unrelated Patreon accounts.
Immediate action required
- affected>= 1.18.0 and < 1.25.2
- affected>= 2.0.0 and < 2.1.2
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.