CVE-2026-18092
XML signature wrapping in Net::SAML2 allows SAML authentication bypass.
Is CVE-2026-18092 being exploited?
Not confirmed. CVE-2026-18092 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 0.20% probability of exploitation in the next 30 days.
How severe is CVE-2026-18092?
CVE-2026-18092 is rated High with a CVSS score of 8.1. 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-2026-18092?
Yes. A fix has been recorded for CVE-2026-18092. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-18092 affect?
CVE-2026-18092 affects Net::SAML2 (< 0.86), Perl web apps using Net::SAML2, SAML Service Providers parsing untrusted Responses. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-18092?
Upgrade Net::SAML2 to >= 0.86 and validate assertions are covered by the signature.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authentication bypass: attacker with any valid signed assertion can add an unsigned assertion earlier in document order to impersonate arbitrary users.
Immediate action required
- affected< 0.86
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.