Skip to main content
Public proof of concept

CVE-2026-104048

Sssd: sssd: authorization bypass via cross-domain username collision in hbac evaluation

A public proof of concept exists; no exploitation attested.

  • Published2026-10-06
  • WeaknessCWE-1025

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A flaw was found in SSSD. In trust-enabled identity management environments, SSSD evaluates Host-Based Access Control (HBAC) rules by stripping domain qualifiers and comparing only short usernames. An authenticated user in a trusted domain who shares the same username as an authorized local account can bypass access policies and gain unauthorized access to protected services or hosts.

Timeline

dates in UTC
  1. 2026-10-0620:17CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-104048?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-104048?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Redhat enterprise linux
BranchAffectedFixed in
7.0= 7.0no fix published
8.0= 8.0no fix published
9.0= 9.0no fix published
10.0= 10.0no fix published
Fedoraproject sssd
BranchAffectedFixed in
2.12= 2.12.0no fix published
Redhat openshift container platform
BranchAffectedFixed in
4.0= 4.0no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2026-104048 Red Hat Product Security166 known affected

    sssd: sssd: Authorization bypass via cross-domain username collision in HBAC evaluation

    libipa_hbac as a component of Red Hat Enterprise Linux 10 · libsss_autofs as a component of Red Hat Enterprise Linux 10 · libsss_certmap as a component of Red Hat Enterprise Linux 10 · +163 more

Full record on NVD

Fix

  1. Workaround from the vendor Red Hat Product Security CVE-2026-104048 · 166 productsMitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
  2. No fix available, says the vendor Red Hat Product Security CVE-2026-104048 · 135 productsFix deferred
  3. No fix planned, says the vendor Red Hat Product Security CVE-2026-104048 · 31 productsOut of support scope

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • CISA-ADPSSVC decisionpoc2026-10-07
  • OpenCVESSVC decisionpoc—
  • CNACVSS 3.16.8read 2026-10-23
  • NVDCVSS 3.18.1read 2026-10-23
  • CNAweakness (CWE)CWE-1025read 2026-10-23
  • FIRST EPSSEPSS score0.3 %2026-10-22

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Published
2026-10-06
Last Modified
2026-10-09
NVD status
Analyzed

Frequently asked questions

What is CVE-2026-104048?

A flaw was found in SSSD. In trust-enabled identity management environments, SSSD evaluates Host-Based Access Control (HBAC) rules by stripping domain qualifiers and comparing only short usernames. An authenticated user in a trusted domain who shares the same username as an authorized local account can bypass access policies and gain unauthorized access to protected services or hosts.

Is CVE-2026-104048 actively exploited?

A proof-of-concept exploit exists for CVE-2026-104048, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-104048?

CVE-2026-104048 has a CVSS v3 base score of 8.1 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.

Running sssd? Hear about its next vulnerability

Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».

Get alerts for this productCISA KEV additions, October 2026Search CVEs

No credit card required · No monthly cap on website lookups · 250 API requests/month

Go further

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database