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Vulnerability record · public intelligence
CVE-2019-3878
HIGH

CVE-2019-3878

Published Mar 26, 2019 · Updated Nov 3, 2026

Severity · CVSSHIGH · Not scored
Known exploitationNot listed
EPSS / likelihood2.97%
QFinch risk scoreNot available

Original summary

Normalized public record · Updated Nov 3, 2026

A vulnerability was found in mod_auth_mellon before v0.14.2. If Apache is configured as a reverse proxy and mod_auth_mellon is configured to only let through authenticated users (with the require valid-user directive), adding special HTTP headers that are normally used to start the special SAML ECP (non-browser based) can be used to bypass authentication.

Publisher and source text is retained separately from QFinch interpretation.

QFinch assessment

A vulnerability was found in mod_auth_mellon before v0.14.2. If Apache is configured as a reverse proxy and mod_auth_mellon is configured to only let through authenticated users (with the require valid-user directive), adding special HTTP headers that are normally used to start the special SAML ECP (non-browser based) can be used to bypass authentication.

Evidence: public source records

Affected products

Affected scope reported by the available public evidence
Affected package, product or rangeFix status
Consult the referenced vendor advisory for affected versions.Consult source advisory

Matching a version is only one part of assessing exposure. QFinch has not assessed your environment on this public page.

Remediation

Apply the vendor-supported fixed release or mitigation, then verify the affected component is no longer reachable.

  1. Confirm the affected product and reachable code path exist in your environment.
  2. Apply the vendor-supported patch or mitigation from the primary advisory.
  3. Rescan the exact deployed revision and retain verification evidence.
Review primary references

Evidence coverage

FIRST-EPSSCVE-LIST-V5
SSVC priority
MEDIUM
Confidence
Not available
Aliases
None reported

Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.

Sources and record history

  1. bugzilla.redhat.com ↗
  2. Source repository ↗
  3. USN-3924-1 ↗
  4. FEDORA-2019-db1e9b3002 ↗
  5. FEDORA-2019-2d8ee47f61 ↗
  6. RHSA-2019:0746 ↗
  7. RHSA-2019:0766 ↗
  8. RHSA-2019:0985 ↗
  9. RHBA-2019:0959 ↗

Record history

Published Mar 26, 2019 · Last refreshed Nov 3, 2026

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