Analyst readout for executives and security teams
Plain-English summary
Nagios Log Server, a tool that collects and displays system logs, has a flaw in versions before 1.4.2 that lets attacker-controlled text inside log entries run as code in a viewer's browser. An admin or analyst opening the affected dashboard could trigger the script, potentially exposing their session within the application.
Executive priority
Schedule a planned upgrade to Nagios Log Server 2024R1 within the normal patch cycle. This is not an emergency, but it affects a security-monitoring tool used by analysts, so a successful attack could undermine the team that watches for other incidents.
Technical view
A stored cross-site scripting weakness (CWE-79) exists in the Dashboards section of Nagios Log Server prior to 1.4.2. Log entries rendered in the Logs table were not safely encoded for the HTML output context, so attacker-supplied data ingested as log content executes in the victim's browser within the application origin. Fixed in the 2024R1 release per Nagios changelog.
Likely exposure
Organizations running Nagios Log Server instances older than 1.4.2 (pre-2024R1) are exposed, particularly where ingested log sources include untrusted or attacker-influenceable fields. Internet-exposed dashboards or shared analyst consoles increase risk; isolated, internal-only deployments with trusted log sources reduce it.
Exploitation context
Not listed in CISA KEV, and the source bundle does not cite active exploitation. Exploitation is plausible but requires an authenticated user (PR:L) to view the malicious log entry (UI:P), and the attacker must be able to land crafted data into an ingested log stream. CVSS 4.0 base score 5.1.
Researcher notes
Stored XSS in the Dashboards Logs table; payload delivery depends on attacker influence over an ingested log field. CVSS 4.0 vector indicates low privileges required and passive user interaction, with limited subsequent confidentiality and integrity impact in the victim browser context. No KEV listing, no public exploit referenced in the bundle. Confirm fix lineage in the Nagios 2024R1 changelog and cross-reference VulnCheck's advisory.
Mitigation direction
- Upgrade Nagios Log Server to 2024R1 (1.4.2) or later per the vendor changelog.
- Restrict dashboard access to trusted, authenticated users and limit admin sessions.
- Review which log sources can be influenced by external or untrusted parties.
- Apply browser-side defenses such as a strict Content Security Policy on the application origin.
- Until patched, avoid opening Logs table dashboards on suspect or unfamiliar log streams.
Validation and detection
- Inventory Nagios Log Server instances and record installed versions against 1.4.2 / 2024R1.
- Confirm the Dashboards Logs table renders log fields with proper output encoding after upgrade.
- Test in a non-production instance by ingesting benign markup and verifying it displays as text, not HTML.
- Review web server and proxy logs for unusual dashboard access patterns by privileged users.
- Verify upgrade success against the vendor changelog and the VulnCheck advisory references.
Public sources used
Based on public source material and reviewed before publication.
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-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. 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 lookupCVE-2016-15049 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
- Medium
- CVSS
- 5.1 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
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.
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:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
5.1MediumVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.nagios.com/changelog/nagios-log-server-2024r1/CVE reference · release-notes, patch
- https://www.vulncheck.com/advisories/nagios-log-server-dashboards-logs-table-xssCVE reference · third-party-advisory
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.
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.