Evidence used
- No CISA KEV confirmation is currently recorded.
- A structured source references public exploit or proof-of-concept material.
- EPSS is 0.28% for the current model date.
BlackTreeCVE IntelligenceFull vulnerability report · 2026
CVE-2026-104048High confidence
Sssd: sssd: authorization bypass via cross-domain username collision in hbac evaluation
Red Hat · Red Hat Enterprise Linux 10
6.8MediumCVSS 3.1
Within 7 days
Fix not verifiedMedium technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.
R
Open reassessment dashboard →Operational reassessment
Published severity in operational context
Published severityMedium→Operational priority:High, raised one band.upgradedsince 7 Oct 2026
Compensating controls
- Restrict the affected network interface to trusted sources where business-safe.
- Increase monitoring for the attack path and post-exploitation behaviour described in the report.
Verification
- Confirm that the asset runs Red Hat Red Hat Enterprise Linux 10 and falls inside the recorded affected range.
- Recheck the vendor advisory before scheduling a change because no verified fixed version is currently retained.
- Validate exposure, authentication requirements and compensating controls in the actual environment.
- Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Distribution package intelligence
3 package statesRelease-specific package status
Debian findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.
Repository candidate not checked
A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.
| Distribution release | Source package | Vendor state | Fixed version | Evidence |
|---|---|---|---|---|
| Debian trixietrixie · source | sssd | Affected, no fix publishedDebian currently tracks this release as open. | Not published in this feed | Debian Security Tracker ↗Source updated 8 Oct 2026 |
| Debian bookwormbookworm · source | sssd | Affected, no fix publishedDebian currently tracks this release as open. | Not published in this feed | Debian Security Tracker ↗Source updated 8 Oct 2026 |
| Debian sidsid · source | sssd | Affected, no fix publishedDebian currently tracks this release as open. | Not published in this feed | Debian Security Tracker ↗Source updated 8 Oct 2026 |
Direct vendor intelligence
2 currentAuthoritative vendor CSAF and VEX advisories
Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.
CVE-2026-104048 · CSAF 2.0 · revision 2 · interimSUSE Product Security TeamCVE-2026-104048
The vendor explicitly identifies these products as affected by this CVE.
- libipa_hbac-devel as component of SUSE Linux Enterprise Desktop 15 SP7
- libipa_hbac0 as component of SUSE Linux Enterprise Desktop 15 SP7
- libsss_certmap-devel as component of SUSE Linux Enterprise Desktop 15 SP7
- libsss_certmap0 as component of SUSE Linux Enterprise Desktop 15 SP7
- libsss_idmap-devel as component of SUSE Linux Enterprise Desktop 15 SP7
- libsss_idmap0 as component of SUSE Linux Enterprise Desktop 15 SP7
- libsss_nss_idmap-devel as component of SUSE Linux Enterprise Desktop 15 SP7
- libsss_nss_idmap0 as component of SUSE Linux Enterprise Desktop 15 SP7
- libsss_simpleifp-devel as component of SUSE Linux Enterprise Desktop 15 SP7
- libsss_simpleifp0 as component of SUSE Linux Enterprise Desktop 15 SP7
- python3-sssd-config as component of SUSE Linux Enterprise Desktop 15 SP7
- sssd as component of SUSE Linux Enterprise Desktop 15 SP7
- Summary
- 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.
- Remediation
- No remediation text is recorded.
CVE-2026-104048 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitysssd: sssd: Authorization bypass via cross-domain username collision in HBAC evaluation
The vendor explicitly identifies these products as affected by this CVE.
- 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
- libsss_idmap as a component of Red Hat Enterprise Linux 10
- libsss_nss_idmap as a component of Red Hat Enterprise Linux 10
- libsss_nss_idmap-devel as a component of Red Hat Enterprise Linux 10
- libsss_sudo as a component of Red Hat Enterprise Linux 10
- python3-libipa_hbac as a component of Red Hat Enterprise Linux 10
- python3-libsss_nss_idmap as a component of Red Hat Enterprise Linux 10
- python3-sss as a component of Red Hat Enterprise Linux 10
- python3-sss-murmur as a component of Red Hat Enterprise Linux 10
- python3-sssdconfig as a component of Red Hat Enterprise Linux 10
- Summary
- 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.
- Remediation
- Mitigation 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.
Medium technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.
Fix not verified01
What, why and how
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.
What
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.
Why
The code performs a comparison between two entities, but the comparison examines the wrong factors or characteristics of the entities, which can lead to incorrect results and resultant weaknesses.
How
An attacker operating through a network path may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.
What
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.
Why
The code performs a comparison between two entities, but the comparison examines the wrong factors or characteristics of the entities, which can lead to incorrect results and resultant weaknesses.
How
An attacker operating through a network path may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.
02
Exploit reality and attack path
CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.
Observed exploitation No confirmed evidence
?
Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.
Public PoC / exploit material Reference recorded
?
Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.CISA Vulnrichment records proof-of-concept exploitation in its SSVC data. BlackTree has not independently executed or validated exploit material.
- Likely attack path
- a network path → Comparison Using Wrong Factors → cause the confidentiality, integrity or availability impact described by the vendor
- Attack surface
- Network
- Privileges required
- Low: a basic authenticated account is required
- User interaction
- None
- Attack complexity
- High: exploitation depends on specific conditions
- Security boundary
- Unchanged: impact remains within the vulnerable component's security authority
- Weakness
?
CWE means Common Weakness Enumeration: a standard category for the underlying weakness. - CWE-1025 ↗
CWE-1025: Comparison Using Wrong Factors. The code performs a comparison between two entities, but the comparison examines the wrong factors or characteristics of the entities, which can lead to incorrect results and resultant weaknesses.
- CVSS vector
?
CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity. CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:NCommon Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.
AVNetworkAttack vector: The vulnerable component can be reached over a network.ACHighAttack complexity: Successful exploitation depends on specific conditions outside the attacker's direct control.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.ANoneAvailability impact: No direct loss is represented by this metric.- Post-exploitation / living off the land
- No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
03
Patch and workaround
Operational remediation based on structured source evidence.
- Status
?
Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change. - Fix not verified
- Affected
- libipa_hbac-devel as component of SUSE Linux Enterprise Desktop 15 SP7
- libipa_hbac0 as component of SUSE Linux Enterprise Desktop 15 SP7
- libsss_certmap-devel as component of SUSE Linux Enterprise Desktop 15 SP7
- libsss_certmap0 as component of SUSE Linux Enterprise Desktop 15 SP7
- libsss_idmap-devel as component of SUSE Linux Enterprise Desktop 15 SP7
- libsss_idmap0 as component of SUSE Linux Enterprise Desktop 15 SP7
- libsss_nss_idmap-devel as component of SUSE Linux Enterprise Desktop 15 SP7
- libsss_nss_idmap0 as component of SUSE Linux Enterprise Desktop 15 SP7
- libsss_simpleifp-devel as component of SUSE Linux Enterprise Desktop 15 SP7
- libsss_simpleifp0 as component of SUSE Linux Enterprise Desktop 15 SP7
- python3-sssd-config as component of SUSE Linux Enterprise Desktop 15 SP7
- sssd as component of SUSE Linux Enterprise Desktop 15 SP7
- sssd-32bit as component of SUSE Linux Enterprise Desktop 15 SP7
- sssd-ad as component of SUSE Linux Enterprise Desktop 15 SP7
- sssd-dbus as component of SUSE Linux Enterprise Desktop 15 SP7
- sssd-ipa as component of SUSE Linux Enterprise Desktop 15 SP7
- sssd-kcm as component of SUSE Linux Enterprise Desktop 15 SP7
- sssd-krb5 as component of SUSE Linux Enterprise Desktop 15 SP7
- sssd-krb5-common as component of SUSE Linux Enterprise Desktop 15 SP7
- sssd-ldap as component of SUSE Linux Enterprise Desktop 15 SP7
- sssd-proxy as component of SUSE Linux Enterprise Desktop 15 SP7
- sssd-tools as component of SUSE Linux Enterprise Desktop 15 SP7
- sssd-winbind-idmap as component of SUSE Linux Enterprise Desktop 15 SP7
- libipa_hbac-devel as component of SUSE Linux Enterprise High Performance Computing 12 SP5
- libipa_hbac0 as component of SUSE Linux Enterprise High Performance Computing 12 SP5
- libsss_certmap0 as component of SUSE Linux Enterprise High Performance Computing 12 SP5
- libsss_idmap-devel as component of SUSE Linux Enterprise High Performance Computing 12 SP5
- libsss_idmap0 as component of SUSE Linux Enterprise High Performance Computing 12 SP5
- libsss_nss_idmap-devel as component of SUSE Linux Enterprise High Performance Computing 12 SP5
- libsss_nss_idmap0 as component of SUSE Linux Enterprise High Performance Computing 12 SP5
- and 908 more
- Fixed
- No fixed version is explicitly recorded in the structured CVE data.
- Action
- No verified patch reference is present in the current structured sources. Check the vendor advisory before making a change.
- Workaround
- No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04
Evidence and provenance
Published 6 Oct 2026 · Last source change 7 Oct 2026, 14:34 UTC · CWE-1025 · Comparison Using Wrong Factors
CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source FIRST · tracked since 2026-10-07
?
The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.European sourceENISA EUVD · EUVD-2026-93942
Product sourceVendor CSAF · SUSE Product Security Team
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD awaiting enrichment
Core structured fields are present and their contributing authorities are shown above.
Material change intelligence
View recent updates ↗What changed after publication
- Public exploit evidencePublic exploit evidence changed from No public exploit to Public exploit reference.CVE.org ↗
- Before
- No public exploit
- After
- Public exploit reference
- ENISA EUVD mappingEUVD-2026-93942 was added to the official ENISA EUVD mapping for this CVE.ENISA EUVD ↗
- Before
- not recorded
- After
- {"euvdId":"EUVD-2026-93942"}
- Catalogue recordCVE added to the BlackTree catalogue.CNA ↗
Technical terms and abbreviations used in this report
- CVE
- Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
- CVSS
- Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
- EPSS
- Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
- CWE
- Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
- CNA
- CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
- CISA ADP
- Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
- NVD
- National Vulnerability Database: NIST's enrichment service for CVE records.
- CERT / CSIRT
- A computer security incident response team that publishes warnings or coordinates incident response.
- PoC
- Proof of concept: public material that demonstrates or helps reproduce exploitation.
- CSAF
- Common Security Advisory Framework: a machine-readable format for security advisories.
- LoTL
- Living off the land: abuse of legitimate tools or system functions during an attack.