VulnerabilityPublished 30 Oct 2025Updated 17 Nov 2025

CVE-2023-7313: Nagios XI · XSS or 'Cross-site Scripting'

Affects Nagios XISource CVE Database V5

Not known to be exploited · CVSS 5.1 Medium · fixed in 5.11.3 : update Nagios XI when convenient.

Data as of 26 Oct 2026, 12:54 UTC

CVSS 4.0 base score

5.1Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.4% chance of exploitation in 30 days – higher than 41% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 5.11.3

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

Attack Vector: Network
Attack Complexity: Low
Attack Requirements: None
Privileges Required: Low
User Interaction: Passive
Vulnerable system confidentiality: None
Vulnerable system integrity: None
Vulnerable system availability: None
Subsequent system confidentiality: Low
Subsequent system integrity: Low
Subsequent system availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Attack Requirements: None: The successful attack does not depend on the deployment and execution conditions of the vulnerable system. The attacker can expect to be able to reach the vulnerability and execute the exploit under all or most instances of the vulnerability.
Privileges Required: Low: The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
User Interaction: Passive: Successful exploitation of this vulnerability requires limited interaction by the targeted user with the vulnerable system and the attacker’s payload. These interactions would be considered involuntary and do not require that the user actively subvert protections built into the vulnerable system.
Vulnerable system confidentiality: None: There is no loss of confidentiality within the Vulnerable System.
Vulnerable system integrity: None: There is no loss of integrity within the Vulnerable System.
Vulnerable system availability: None: There is no impact to availability within the Vulnerable System.
Subsequent system confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the Subsequent System.
Subsequent system integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact to the Subsequent System.
Subsequent system availability: None: There is no impact to availability within the Subsequent System or all availability impact is constrained to the Vulnerable System.

Definitions: FIRST CVSS v4.0 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 30 Oct 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
Nagios XI	Affected =0	Fixed in–

AI-suggested

European organizations should immediately verify their Nagios XI version and upgrade to version 5.11.3 or later where the vulnerability is patched. In the absence of an official patch, organizations should restrict access to the Bulk Modifications tool to trusted administrators only and implement strict input validation and output encoding on all user-supplied data within Nagios XI interfaces. Deploying Content Security Policies (CSP) can help mitigate the impact of injected scripts by restricting script execution sources. Monitoring and logging user activities around the Bulk Modifications tool can help detect suspicious behavior indicative of exploitation attempts. Additionally, organizations should educate users about the risks of interacting with untrusted links or inputs within the Nagios XI environment. Network segmentation and multi-factor authentication (MFA) for Nagios XI access can further reduce the risk of exploitation. Regular vulnerability scanning and penetration testing focused on web application security should be conducted to identify similar issues proactively.

Description

CVE-2023-7313 is a medium-severity cross-site scripting (XSS) vulnerability in Nagios XI versions prior to 5.11.3, specifically in the Bulk Modifications tool. It arises from improper neutralization of user input, allowing attackers to inject and execute arbitrary scripts in the context of a victim's browser. Exploitation requires low privileges and user interaction but no authentication. While no known exploits are currently reported in the wild, successful attacks could lead to session hijacking, credential theft, or unauthorized actions within the Nagios XI interface. European organizations using affected Nagios XI versions should prioritize patching and implement input validation and Content Security Policies to mitigate risk. Countries with significant Nagios XI deployments and critical infrastructure monitoring, such as Germany, France, and the UK, are most likely to be impacted. Given the medium CVSS score of 5.1, the vulnerability poses a moderate risk but should not be underestimated due to the sensitive nature of monitoring platforms.

Impact

For European organizations, the impact of CVE-2023-7313 can be significant due to the role Nagios XI plays in monitoring IT infrastructure and critical systems. Successful exploitation could allow attackers to execute arbitrary scripts in the context of legitimate users, potentially leading to session hijacking, unauthorized access to monitoring data, or manipulation of monitoring configurations. This could disrupt incident detection and response, delay remediation efforts, or expose sensitive operational data. Organizations in sectors such as finance, energy, telecommunications, and government, which rely heavily on Nagios XI for infrastructure monitoring, may face increased risk of operational disruption or data breaches. The medium severity score reflects moderate risk, but the potential for lateral movement or escalation within an environment after initial compromise elevates the threat. Additionally, the requirement for user interaction and low privileges reduces the likelihood of automated exploitation but does not eliminate targeted attacks. The absence of known exploits in the wild currently lowers immediate risk but should not lead to complacency.

Summary

CVE-2023-7313 is a cross-site scripting (XSS) vulnerability classified under CWE-79 that affects Nagios XI versions prior to 5.11.3. The vulnerability exists in the Bulk Modifications tool where insufficient validation or escaping of user-supplied input allows an attacker to inject malicious scripts. When a victim interacts with the crafted input, the injected script executes in their browser context, potentially enabling session hijacking, theft of credentials, or unauthorized actions within the Nagios XI web interface. The vulnerability has a CVSS 4.0 base score of 5.1, indicating medium severity. The vector metrics indicate network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:L - low privileges), and user interaction required (UI:P). The scope is limited (S: I), and the impact on confidentiality, integrity, and availability is none or low, but the risk lies in the potential misuse of user sessions or data. No known exploits have been reported in the wild, but the vulnerability's presence in a widely used IT infrastructure monitoring tool makes it a notable risk. The lack of a patch link in the provided data suggests organizations should verify with Nagios for updates or mitigations. The vulnerability highlights the importance of proper input sanitization and escaping in web applications, especially those managing critical infrastructure.

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (opens in a new tab)
Base weaknessLikelihood of exploit: HighCWE Top 25 (2025): #1OWASP Top 10 A05:2025: Injection (opens in a new tab)
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
Architecture and Design · Libraries or Frameworks
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
Implementation · Architecture and Design
Understand the context in which your data will be used and the encoding that will be expected. This is especially important when transmitting data between different components, or when generating outputs that can contain multiple encodings at the same time, such as web pages or multi-part mail messages.
Architecture and Design · Implementation · Attack Surface Reduction
Understand all the potential areas where untrusted inputs can enter your software: parameters or arguments, cookies, anything read from the network, environment variables, reverse DNS lookups, query results, request headers, URL components, e-mail, files, filenames, databases, and any external systems that provide…
OWASP Cheat Sheets
Cross Site Scripting Prevention (opens in a new tab)
DOM based XSS Prevention (opens in a new tab)
Injection Prevention (opens in a new tab)
Abuse Case (opens in a new tab)
Deserialization (opens in a new tab)
OWASP ASVS 4.0.3
V5.3.3 (opens in a new tab)
V1.5.1 (opens in a new tab)
Attack patterns
XSS Using MIME Type Mismatch (opens in a new tab)
DOM-Based XSS (opens in a new tab)
Reflected XSS (opens in a new tab)
Stored XSS (opens in a new tab)
Cross-Site Scripting (XSS) (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 24 Nov 2025, 18:35 UTC

WeaknessesCWE-79

Technical details

References

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