CVE-2026-53977
Auth bypass allows unauthenticated POST to /api/system/shutdown to stop the server.
Is CVE-2026-53977 being exploited?
Not confirmed. CVE-2026-53977 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 0.52% probability of exploitation in the next 30 days.
How severe is CVE-2026-53977?
CVE-2026-53977 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-2026-53977?
Not known from our data. No patch reference has been recorded for CVE-2026-53977, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-53977 affect?
CVE-2026-53977 affects OpenChamber 1.11.7, Express-based OpenChamber deployments. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-53977?
Block or restrict /api/system/shutdown (firewall/reverse-proxy/localhost), apply vendor patch when released.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated remote denial-of-service: attacker can POST /api/system/shutdown to terminate the server, ending all AI coding sessions and locking out users.
Immediate action required
- affected<= 1.11.7
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.