Security readout for executives and security teams
Plain-English summary
This is a Windows local privilege escalation flaw in Accessibility Infrastructure ATBroker.exe. An attacker who already has a low-privileged account on a vulnerable Windows system could potentially gain higher privileges. Microsoft rates it high severity and lists an official remediation. It is not marked in the provided bundle as known exploited.
Executive priority
Treat this as a high-priority patching item, especially for shared, remote-access, and privileged operational systems. It is not described as remotely exploitable from the network, but it can materially worsen any endpoint or server compromise by enabling privilege escalation.
Technical view
CVE-2026-24291 is CWE-732, incorrect permission assignment for a critical resource in Windows Accessibility Infrastructure ATBroker.exe. CVSS 3.1 is 7.8: local attack, low complexity, low privileges, no user interaction, and high confidentiality, integrity, and availability impact. Affected products span listed Windows 10, Windows 11, and Windows Server versions.
Likely exposure
Exposure is broad where the listed Windows client or server versions are present and not patched. The issue requires local authenticated access, so risk is highest on shared workstations, VDI, developer endpoints, terminal servers, and systems where attackers may already have a foothold.
Exploitation context
The provided data does not show KEV listing or confirmed active exploitation. Exploitation would be local post-access privilege escalation, not initial remote compromise. Public references include MSRC guidance and MDSec RegPwn materials, but the bundle does not prove exploitation in the wild.
Researcher notes
Key constraints are local access and low privileges. The most important validation questions are patch presence, exact Windows build coverage, and whether ATBroker-related permission changes were remediated by the Microsoft update. Evidence in the bundle supports high severity, not confirmed active exploitation.
Mitigation direction
- Apply the Microsoft security update for CVE-2026-24291 through normal patch channels.
- Prioritize shared Windows systems, RDP-accessible hosts, admin workstations, and servers with many local users.
- Check MSRC guidance for any updated workarounds or supersedence notes.
- Limit unnecessary local logon rights and reduce standing administrative privileges.
- Track patch deployment through endpoint management and vulnerability management tooling.
Validation and detection
- Inventory Windows assets against the affected product and version list in the bundle.
- Confirm the relevant Microsoft update is installed on each in-scope host.
- Review scanner findings specifically mapped to CVE-2026-24291.
- Check whether high-risk shared systems received the update first.
- Monitor trusted advisories for any change in exploitation status.
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-732: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. 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-2026-24291 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
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/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
1 official scoreWe 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:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C1.85.9microsoftVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
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.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- Windows Accessibility Infrastructure (ATBroker.exe) Elevation of Privilege VulnerabilityCVE reference, microsoft · vendor-advisory, patch
- https://www.mdsec.co.uk/2026/03/rip-regpwn/CVE reference, CVE
- https://github.com/mdsecactivebreach/RegPwnCVE reference, CVE
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.
Incorrect Permission Assignment for Critical Resource
Incorrect Permission Assignment for Critical Resource represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.