Security readout for executives and security teams
Plain-English summary
.NET has a local privilege elevation flaw caused by improper input validation. An attacker would need local access and user interaction, but successful exploitation could expose sensitive data, modify system state, and partially affect availability. Microsoft lists official remediation, so affected environments should patch on normal high-priority timelines.
Executive priority
Treat as a high-priority patching item, not an emergency internet-wide exposure based on current evidence. Focus first on systems where local users, developers, contractors, or automation can execute code.
Technical view
CVE-2026-35433 affects listed .NET 8.0, 9.0, 10.0, and .NET Framework configurations. The CVSS 3.1 score is 7.3 with local attack vector, low complexity, no privileges required, user interaction required, and high confidentiality and integrity impact. The CWE mapping includes integer overflow and improper input validation.
Likely exposure
Systems with the listed Microsoft .NET or .NET Framework versions installed are potentially exposed, especially workstations, application servers, build hosts, or shared systems where local code or user-launched content can interact with affected components.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation. CVSS marks exploit code maturity as unproven. The attack is local and requires user interaction, limiting remote mass exploitation but still relevant for post-compromise privilege escalation.
Researcher notes
The bundle does not identify the vulnerable component, trigger condition, proof of concept, or precise user-interaction scenario. Avoid assuming exploitability beyond the CVSS and vendor description. Current analysis is limited to published CVE, MSRC, and Red Hat reference metadata.
Mitigation direction
- Apply Microsoft updates referenced by the MSRC advisory.
- Inventory installed .NET and .NET Framework versions across endpoints and servers.
- Check Red Hat guidance for any Linux package applicability or non-affected status.
- Prioritize shared systems, developer machines, build agents, and high-value application servers.
- Use vendor guidance if patch details differ by operating system or package source.
Validation and detection
- Confirm whether listed .NET or .NET Framework versions are present.
- Verify Microsoft security updates are installed on affected Windows systems.
- Review Red Hat CVE and VEX entries for applicable package status.
- Document assets requiring delayed patching and compensating access controls.
- Monitor vendor advisories for revised affected-version or remediation details.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-190: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCWE-20: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-35433 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L/E:U/RL:O/RC:C
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
2 official scoresWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L/E:U/RL:O/RC:C1.85.5microsoftCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L1.85.5redhat-SADPVulnerability scoring details
Base CVSS 3.1 score
7.3HighVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L/E:U/RL:O/RC:C
Base CVSS 3.1 score
7.3HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- ADP timelineredhat-SADP
Made public.
- CVE publishedCVE Program
The CVE record was published.
- ADP timelineredhat-SADP
Reported to Red Hat.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
- 2026-05-12T18:01:11.848Z: Reported to Red Hat.
- 2026-05-12T16:58:34.612Z: Made public.
Source materials
- CVE List V5 sourceCVE List V5
- .NET Elevation of Privilege VulnerabilityCVE reference, microsoft · vendor-advisory, patch
- https://access.redhat.com/security/cve/CVE-2026-35433CVE reference, redhat-SADP · vdb-entry, x_refsource_REDHAT
- RHBZ#2476577CVE reference, redhat-SADP · issue-tracking, x_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-35433.jsonCVE reference, redhat-SADP · x_sadp-csaf-vex
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Integer Overflow or Wraparound
Integer Overflow or Wraparound represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
Improper Input Validation
Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.