Windows Task Scheduler Elevation of Privilege Vulnerability
CVE-2024-49039 is an elevation of privilege vulnerability in Microsoft Windows Task Scheduler. Microsoft describes it as allowing a specially crafted application to elevate privileges to Medium Integrity level, and multiple reports state it can be triggered from a low-privilege AppContainer context. Supporting reporting from ESET and Google Threat Intelligence Group indicates the flaw was used as part of an exploit chain with Firefox CVE-2024-9680 to escape the browser sandbox. GTIG further reported the chain abused Windows RPC behavior associated with Task Scheduler to let an unprivileged context create and execute scheduled tasks as SYSTEM, resulting in escalation from low integrity to SYSTEM. Publicly available content does not identify the exact vulnerable function or patch-diff-confirmed root cause, but the vulnerability is consistently characterized as a Task Scheduler/RPC privilege boundary failure enabling AppContainer escape and local privilege escalation.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository provides a proof-of-concept (POC) exploit for CVE-2024-49039, a vulnerability in the WPTaskScheduler.dll component of Windows Task Scheduler (present since Windows 10 1507). The exploit leverages the Task Scheduler's RPC interface to create persistent scheduled tasks, bypassing sandbox and integrity restrictions (such as those imposed on Chrome renderer or AppContainer processes). The main entry point is 'main.cpp', which demonstrates both task creation (for persistence) and task enumeration/deletion via RPC calls. The exploit can be compiled as an executable or DLL (for reflective injection), and is tested on multiple Windows versions (Windows 10, 11, Server 2016). The codebase includes custom IDL definitions for the RPC interface, and uses the 'ncalrpc' protocol for local RPC communication. The exploit does not provide a weaponized payload but demonstrates the ability to persist and escalate privileges by abusing the vulnerable interface. No external network endpoints are used; all actions are performed locally via RPC and file system interactions.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
27 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Microsoft Windows Task Scheduler privilege escalation vulnerability that CISA KEV’s knownRansomwareCampaignUse field flipped from Unknown to Known (indicating evidence of ransomware campaign use).
A Windows privilege-escalation vulnerability reportedly chained with a Firefox bug to complete compromise and deliver a RomCom backdoor.
A Windows Task Scheduler vulnerability used as part of an exploit chain by RomCom (details not expanded in the provided content).
A vulnerability leading to arbitrary code execution in Firefox, Thunderbird, and the Tor Browser, exploited by RomCom.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.