CVE-2026-70617
Auth bypass lets authenticated users join private group DMs and act as members.
Is CVE-2026-70617 being exploited?
Not confirmed. CVE-2026-70617 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 0.23% probability of exploitation in the next 30 days.
How severe is CVE-2026-70617?
CVE-2026-70617 is rated High with a CVSS score of 8.6. 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-2026-70617?
Yes. A fix has been recorded for CVE-2026-70617. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-70617 affect?
CVE-2026-70617 affects Spacebar Server (versions before commit dcfd910), API: PUT /channels/{channel_id}/recipients/{user_id}. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-70617?
Upgrade to commit dcfd910 or later; restrict and monitor recipients PUT API; audit DM memberships.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated attackers can join private group DMs, read history, post messages, and force-add third parties via unguarded PUT endpoint.
Immediate action required
- affected<= dcfd91035e3da42abf5f32d8d86a35219225b3d4
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.