CVE-2026-87899
Execution with unnecessary privileges in cPanel allows remote authenticated users to execute arbitrary code with root privileges.
CVSS
—
Sin CVSS
EPSS
0.6%
p46
KEV
—
Exploit Today
14
0-100
Publicado: 23 sept 2026 · Última mod.: 24 sept 2026 · CWE-250
0.5%EPSS · 30 días0.6%
2026-09-242026-10-20
Execution with unnecessary privileges in cPanel allows remote authenticated users to execute arbitrary code with root privileges.
CVECVSSEPSSKEVRExplotTítuloVis.
CVE-2026-1047958.8 ALT5.3%
——2The insights-runtime-extractor runs as a privileged DaemonSet (`hostPID: true`)
that scans container processes for runtime fingerprinting. When scanning a
container, the coordinator:
1. **fork()s** a child process
2. **setns()** into the target container's PID and mount namespaces
3. **fchdir()** back to an orphaned FD pointing at the extractor's own root
filesystem (where `/crio.sock` is hostPath-mounted)
4. Calls **only `seteuid(target_uid)`** — changing the effective UID but leaving
the **real UID and saved-set-UID at 0** and **retaining the permitted
capability set**
5. The `check_no_privileged_perms()` guard inspects only the Effective capability
set (so it passes), and is **skipped entirely when the target runs as uid 0**
6. The `VersionExecutable` fingerprint invokes `fpr_kind_executable` with
`process.command_line[0]` — the target's argv[0], read from
`/proc/<pid>/cmdline` and **fully controlled by the workload**
7. `fpr_kind_executable` calls `exec.Command(executable, "--version").Output()`
— executing the **workload's own binary** inside the workload's mount
namespace while **ruid=0 in the host user namespace**
The executed process can call `setuid(0)` to restore full root with
`CAP_SYS_ADMIN`, and inherits the orphaned cwd which resolves into the extractor
container's filesystem containing the host CRI-O socket.
## Affected Code
### 1. Insufficient privilege drop (Rust — extractor coordinator)
**File:** `extractor/src/insights_runtime_extractor.rs`
```rust
// Lines 139-146 — seteuid-only drop, guard skipped for root containers
join_process_namespaces(process.pid)?;
change_dir(current_dir);
switch_user(*process.uid)?;
if *process.uid != 0 {
perms::check_no_privileged_perms()
.expect("Must not have privileged permissions to run fingerprints");
}
fingerprint::run_fingerprints(&config, out_dir, &process);
```
```rust
// Lines 182-185 — only effective UID changed; ruid/suid stay 0
fn switch_user(uid: u32) -> Result<(), ScannerError> {
debug!("... Becoming user: {uid}");
seteuid(uid.into()).map_err(|e| ScannerError::Errno(e))
}
```
### 2. Execution of untrusted binary (Go — fingerprint)
**File:** `fingerprints/pkg/utils/file.go`
```go
// Lines 75-80 — executes a path taken verbatim from workload's argv[0]
func GetExecutableVersionOutput(executable string) (string, error) {
out, err := exec.Command(executable, "--version").Output()
if err != nil {
return "", err
}
return string(out), nil
}
```
### 3. Workload-controlled path forwarded (Rust — version_executable)
**File:** `version_executable.rs`
```rust
// Lines 29-34 — workload-controlled command_line[0] forwarded to fingerprint
return Some(vec![
fpr_kind_executable,
out_dir.to_string(),
String::from(&process.command_line[0]),
String::from(&version_executable.runtime_kind_name),
]);
```
## Attack Pattern
**Attacker:** Any tenant able to schedule a pod (unprivileged, any namespace)
**Victim:** The node running the insights-runtime-extractor DaemonSet
**Trigger:** Automatic — the DaemonSet scans all container processes on the node
**Attack sequence:**
1. Attacker creates a pod whose process name matches a configured
versioned-executable pattern (`node`, `python`, `python3`, `MainThread`,
or contains `java`)
2. The pod's main binary (at the path matching argv[0]) is a malicious
executable that calls `setuid(0)` to restore root
3. When the insights operator triggers a scan, the DaemonSet forks, enters the
attacker's mount namespace, and executes the attacker's binary with ruid=0
4. The attacker's code regains full root with `CAP_SYS_ADMIN` in the host user
namespace
5. The inherited cwd contains the host CRI-O socket → full node compromise1dCVE-2026-1101505.5 MED0.6%
——0Privilege elevation in Installer in Google Chrome on on Windows prior to 155.0.8059.79 allowed a local attacker to obtain sensitive information via a local program. (Chromium security severity: High)7dCVE-2026-877095.5 MED15.2%
——5Improper access control in Windows Host Guardian Service allows an authorized attacker to perform tampering locally.5dCVE-2026-6516210.0 CRÍ50.7%
——15NVIDIA AIStore for Linux contains a vulnerability in the legacy ETL Kubernetes PodSpec initialization API where a remote attacker may supply Kubernetes host-namespace and container-security settings. A successful exploit may lead to code execution, privilege escalation, information disclosure, data tampering, and denial of service.8dCVE-2026-756216.2 MED1.5%
——0IBM Aspera Enterprise WebApps 1.0.0 through 1.0.6 could allow a local attacker to obtain sensitive information due to excessive permissions assigned to a service account.8dCVE-2026-1088206.3 MED18.4%
——6A weakness has been identified in agno-agi agno up to 3.0.6/3.1.1. This issue affects the function member_agent.run in the library libs/agno/agno/team/_default_tools.py of the component Delegation Feature. Executing a manipulation can lead to execution with unnecessary privileges. The attack can be executed remotely. The exploit has been made available to the public and could be used for attacks. The pull request to fix this issue awaits acceptance.6d