high severityConfidence mediumHistorical record

Net::SAML2 authentication bypass via unsigned encrypted assertions

Direct answer

Net::SAML2 authentication bypass via unsigned encrypted assertions, also tracked as CVE-2026-18108 is a high-severity threat campaign HOL Guard tracked from Aug 4, 2026 to Aug 4, 2026, verified against 3 primary sources and last reviewed Sep 20, 2026. Active tracking has ended and the record remains published as a permanent historical research record.

Net::SAML2 authentication bypass via unsigned encrypted assertions. Upgrade to the patched release.

Also tracked as CVE-2026-18108

First observed
Aug 4, 2026
Last observed
Aug 4, 2026
Last reviewed
Sep 20, 2026
Tracking ended
Aug 4, 2026

Record exports

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Uncertainty and limitations

Read the evidence limits before acting on this record.

Confirm exact fixed version against the live advisory.

  • Campaign tracks CVE-2026-18108 only.
  • HOL blog is operator guidance.

Guard coverage and policy

What Guard's reviewed assertions do and do not claim for this campaign, and the reviewed starting points for defense.

No Guard coverage mapping or campaign-specific policy guidance is published for this record.

Safe next step. Campaign guidance is defensive context. It does not auto-apply policy or claim universal campaign coverage.

Open policy controlsCampaign-specific emergency policy starting point

Timeline

Reviewed events, oldest first, each tied to a verified source.

  1. Disclosure

    CVE-2026-18108 Net::SAML2 auth bypass disclosed.

    Sources:NVD CVE-2026-18108·CVE Record CVE-2026-18108

  2. Update

    HOL Guard published operator coverage.

    Source:HOL Guard operator write-up

Publication clock: 1147.4 hours from reviewed disclosure timestamp to HOL publication; 24-hour high target; historical backfill outside target.

Sources

Every claim on this record is traceable to the sources below.

Campaign questions, answered

Net::SAML2 authentication bypass via unsigned encrypted assertions. Upgrade to the patched release. HOL Guard tracked the campaign from Aug 4, 2026 to Aug 4, 2026.

No. Active tracking ended Aug 4, 2026; this page remains as a labeled historical research record and does not imply the threat is currently active.

The record cites 3 primary sources, names 0 reviewed artifacts, and was last fully reviewed Sep 20, 2026 by HOL Guard Security Publishing. Its uncertainty and limitations are stated on the record itself.

Campaign guidance is defensive context. It does not auto-apply policy or claim universal campaign coverage.

The permalink above is permanent. The full record can be downloaded from this page as JSON, an artifact CSV, and a STIX 2.1 bundle, and corrections can be requested through the published correction path on the record. Confirm exact fixed version against the live advisory.

Reviewed in full by HOL Guard Security Publishing.

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Record HGTC-2026-9831F4D4