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CVE-2011-10038· NVD / CVE Program· CNA VulnCheck

Nagios XI < 2011R1.9 XSS via Recurring Downtime Script

Nagios XI versions prior to 2011R1.9 are vulnerable to cross-site scripting (XSS) via the recurring downtime script of the web interface. Insufficient validation or escaping of user-supplied input may allow an attacker to inject and execute arbitrary script in the context of a victim's browser.

MediumCVSS 5.1 · v4.0—No exploit No fix recorded
Published
Oct 30, 2025
Updated
Jun 16, 2026
EPSS
0.4% · 36th percentile
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Report tools

JSON

Action score

20

Monitor

Low priority for now.

CVSS
20 / 40 · 5.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · VulnCheck
5.1
NVD has not scored this yet; the score shown is the CNA’s.

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

VendorProduct
nagiosnagios xi

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • nagios nagios xiup to 2009 inclusive
  • nagios nagios xi2011

Versions reported by the vendor

Affected version ranges reported by the assigning authority (VulnCheck). Independent of NVD's CPE analysis and usually ahead of it.

  • Nagios XI

    • before 2011R1.9affected

Same product

nagios: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-25298Nagios XI version xi-5.7.5 is affected by OS command injection.KEV
    88Now
  • CVE-2019-15949Nagios XI before 5.6.6 allows remote command execution as root.KEV
    88Now
  • CVE-2021-25296Nagios XI version xi-5.7.5 is affected by OS command injection.KEV
    87Now
  • CVE-2021-25297Nagios XI version xi-5.7.5 is affected by OS command injection.KEV
    82Now
  • CVE-2018-15708Snoopy 1.0 in Nagios XI 5.5.6 allows remote unauthenticated attackers to execute arbitrary commands via a crafted HTTP request.
    66This week
  • CVE-2021-37350Nagios XI before version 5.8.5 is vulnerable to SQL injection vulnerability in Bulk Modifications Tool due to improper input sanitisation.
    63This week

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2023-48082381 days apartNagios XI before 2024R1 was discovered to improperly handle API keys generation (randomly-generated), allowing attackers to possibly generat
    36Monitor
  • CVE-2020-368620 days apartNagios XI < 5.6.11 Unauthenticated XSS and SSRF via Highcharts
    27Monitor
  • CVE-2025-5643265 days apartA cross-site scripting (XSS) vulnerability exists in Nagios XI 2024R2.
    24Monitor
  • CVE-2024-54958252 days apartNagios XI 2024R1.2.2 is susceptible to a stored Cross-Site Scripting (XSS) vulnerability in the Tools page.
    24Monitor
  • CVE-2024-54959252 days apartNagios XI 2024R1.2.2 is vulnerable to a Cross-Site Request Forgery (CSRF) attack through the Favorites component, enabling POST-based Cross-
    24Monitor
  • CVE-2024-42898294 days apartA cross-site scripting (XSS) vulnerability in Nagios XI 2024R1.1.4 allows attackers to execute arbitrary web scripts or HTML via a crafted p
    21Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
P
Scope
X

Weakness class (CWE)

CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSS 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

nvd-secondary

Root cause

User content is inserted into the page as HTML. The browser interprets the content as code rather than data.

The bug in code

The whole CWE-79 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

ts
commentEl.innerHTML = comment.body;

Fixed

ts
commentEl.textContent = comment.body;

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records