CVE-2026-55789
Authenticated XML injection lets low-priv user forge signed SAML attributes in Logto <1.41.0
Is CVE-2026-55789 being exploited?
Not confirmed. CVE-2026-55789 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 0.40% probability of exploitation in the next 30 days.
How severe is CVE-2026-55789?
CVE-2026-55789 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-2026-55789?
Yes. A fix has been recorded for CVE-2026-55789. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-55789 affect?
CVE-2026-55789 affects Logto self-hosted SAML IdP < 1.41.0, samlify 2.10.0 (used for templating). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-55789?
Upgrade Logto to v1.41.0+, review SAML attribute mappings, rotate credentials
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated low-priv user can inject XML into profile attributes causing forged signed SAML assertions (e.g., arbitrary roles) and escalate privileges at relying SPs.
Immediate action required
- affected< 1.41.0
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.