CVE-2016-15049 Nagios Log Server < 1.4.2 Dashboards Logs Table XSS

What is CVE-2016-15049?

CVE-2016-15049 is a medium-severity cross-site scripting vulnerability in Nagios Log Server, published on 30 Oct 2025. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

Nagios Log Server versions prior to 1.4.2 are vulnerable to cross-site scripting (XSS) in the Dashboards section when rendering log entries in the Logs table. Untrusted log content was not safely encoded for the output context, allowing attacker-controlled data present in logs to execute script in the victim’s browser within the application origin.

Weakness: CWE-79

Which versions are affected by CVE-2016-15049?

It affects 1 product.

Products include Nagios Log Server.

How do I fix CVE-2016-15049?

No fix has been published for CVE-2016-15049 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2016-15049 being exploited?

There is no known exploitation of CVE-2016-15049 in the wild and no public exploit code.

Other vulnerabilities in Nagios Log Server

• CVE-2025-44823 Information disclosure in Log Server Critical 9.9
• CVE-2025-34277 Nagios Log Server < 2024R1.3.1 RCE via Malformed Dashboard ID Critical 9.4
• CVE-2025-34274 Nagios Log Server < 2024R2.0.3 Logstash Process Root Privileges Critical 9.3
• CVE-2023-7322 Nagios Log Server < 2024R1 Incorrect Authorization Granting Full API Access High 8.7
• CVE-2025-34271 Nagios Log Server < 2024R2.0.2 Cluster Manager Credential Requests Sent Over Plaintext High 8.7

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-fjxm-h5hx-rv42.