CVE-2026-27803
Vaultwarden ACL bypass: manage=false can perform collection ops; fixed 1.35.4.
Is CVE-2026-27803 being exploited?
Not confirmed. CVE-2026-27803 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 0.29% probability of exploitation in the next 30 days.
How severe is CVE-2026-27803?
CVE-2026-27803 is rated High with a CVSS score of 8.3. 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-2026-27803?
Yes. A fix has been recorded for CVE-2026-27803. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-27803 affect?
CVE-2026-27803 affects Vaultwarden <1.35.4. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-27803?
Upgrade to 1.35.4+
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Privilege escalation: unauthorized collection management actions via ACL bug; data/config changes possible.
Patch when possible
- affected< 1.35.4
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.