CVE-2026-55454
Authenticated SSRF can takeover bundled Caddy admin API.
Is CVE-2026-55454 being exploited?
Not confirmed. CVE-2026-55454 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 0.60% probability of exploitation in the next 30 days.
How severe is CVE-2026-55454?
CVE-2026-55454 is rated Critical with a CVSS score of 9.9. 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-2026-55454?
Yes. A fix has been recorded for CVE-2026-55454. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-55454 affect?
CVE-2026-55454 affects Appsmith. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-55454?
Upgrade to Appsmith 2.1+; verify proxy config; restrict admin API.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated low-priv attacker can SSRF to 0.0.0.0:2019 and POST /load, replacing Caddy config and seizing reverse proxy.
Immediate action required
- affected< 2.1
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.