CVE-2026-10745: upKeeper Log Injection Vulnerability

CVE-2026-10745 Overview

CVE-2026-10745 is an improper output neutralization for logs vulnerability [CWE-117] in upKeeper Solutions upKeeper Instant Privilege Access on Windows. The flaw affects all versions through 1.6.1 and enables Log Injection, Tampering, and Forging attacks. Attackers can inject crafted content into log entries without prior authentication or user interaction. Successful exploitation impacts the integrity, confidentiality, and availability of downstream systems that consume those logs.

Critical Impact
Unauthenticated network attackers can forge or tamper with log records in upKeeper Instant Privilege Access through 1.6.1, undermining audit trails and downstream log-processing systems.

Affected Products

upKeeper Solutions upKeeper Instant Privilege Access on Windows
All versions through 1.6.1
Deployments relying on upKeeper Instant Privilege Access logs for audit or SIEM ingestion

Discovery Timeline

2026-06-24 - CVE-2026-10745 published to NVD
2026-06-24 - Last updated in NVD database

Technical Details for CVE-2026-10745

Vulnerability Analysis

The vulnerability stems from improper neutralization of output written to logs by upKeeper Instant Privilege Access. The application accepts attacker-controlled input and writes it into log files without sanitizing control characters, newlines, or formatting sequences. This allows an attacker to inject synthetic log entries, overwrite contextual fields, or break log parsers that consume the data downstream.

The issue is classified under [CWE-117] Improper Output Neutralization for Logs. Because privileged access management products are commonly used as authoritative sources for forensic and compliance evidence, log tampering directly affects incident response. The advisory notes the issue affects all releases up to and including 1.6.1.

Root Cause

The root cause is missing or insufficient encoding of untrusted data prior to log writes. User-supplied fields are concatenated into log lines without escaping characters such as carriage return (\r), line feed (\n), or delimiters used by parsing pipelines. Downstream SIEM and log aggregation tools then interpret injected content as legitimate log records.

Attack Vector

The attack vector is network-based and requires no authentication or user interaction. An attacker submits crafted strings to any endpoint or input field whose values are written to logs. Injected newline sequences create forged entries that can impersonate administrative actions, hide malicious activity, or trigger errors in log processors. Because the subsequent system impact spans confidentiality, integrity, and availability, downstream log consumers, dashboards, and alerting workflows are all at risk.

No verified public proof-of-concept is available. Refer to the upKeeper CVE-2026-10745 Advisory for vendor technical details.

Detection Methods for CVE-2026-10745

Indicators of Compromise

Log lines from upKeeper Instant Privilege Access containing embedded \r\n, %0a, or %0d sequences in user-supplied fields.
Duplicate or out-of-sequence timestamps within the same log file or stream.
Log entries attributing privileged actions to accounts that did not authenticate during the corresponding window.
Parser errors or malformed records in SIEM ingestion pipelines tied to upKeeper sources.

Detection Strategies

Hunt for unescaped control characters in fields originating from upKeeper Instant Privilege Access logs.
Correlate upKeeper authentication events with Windows Security event logs to identify forged entries that lack a matching OS-level event.
Baseline normal log volume and field cardinality, then alert on sudden spikes consistent with injection attempts.

Monitoring Recommendations

Forward upKeeper logs to a tamper-resistant collector with write-once storage before parsing.
Enable integrity hashing or signing on log files at the host level on Windows.
Validate parser output against schema rules and reject records containing raw newline or delimiter characters in value positions.

How to Mitigate CVE-2026-10745

Immediate Actions Required

Inventory all upKeeper Instant Privilege Access deployments and identify instances running version 1.6.1 or earlier.
Restrict network exposure of the upKeeper management interface to trusted administrative networks.
Preserve and back up existing log files before remediation to retain forensic evidence.
Review recent privileged access logs for signs of injected or forged entries.

Patch Information

upKeeper Solutions has published an advisory for CVE-2026-10745. Apply the fixed release identified in the upKeeper CVE-2026-10745 Advisory as soon as it is available in your change-management process. The advisory confirms that versions through 1.6.1 are affected, so any release after 1.6.1 from the vendor should be evaluated for remediation status.

Workarounds

Place upKeeper Instant Privilege Access behind a reverse proxy that strips or encodes CR/LF characters in request parameters.
Configure log forwarders to escape or drop control characters before records reach SIEM parsers.
Apply least-privilege network ACLs to limit which hosts can reach the upKeeper service over the network.

bash

# Configuration example: sanitize CR/LF in forwarded logs (rsyslog template)
template(name="upkeeper_safe" type="string"
  string="%timegenerated% %HOSTNAME% upkeeper: %msg:::sp-if-no-1st-sp,drop-cc%\n")
if $programname == 'upkeeper' then {
  action(type="omfile" file="/var/log/upkeeper.log" template="upkeeper_safe")
  stop
}