CVE-2026-55665
Stored XSS in Grist allows editors to run JavaScript in other users' sessions.
Is CVE-2026-55665 being exploited?
Not confirmed. CVE-2026-55665 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 0.53% probability of exploitation in the next 30 days.
How severe is CVE-2026-55665?
CVE-2026-55665 is rated High with a CVSS score of 8.5. 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-2026-55665?
Yes. A fix has been recorded for CVE-2026-55665. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-55665 affect?
CVE-2026-55665 affects Grist < 1.7.15, Self-hosted Grist instances, Grist cloud/shared documents. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-55665?
Upgrade to Grist 1.7.15; audit shared docs and restrict editor permissions.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Stored XSS lets a malicious editor execute JS as victims to read/modify data, change sharing, and escalate to owner.
Immediate action required
- affected< 1.7.15
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.