CVE-2023-49179Network attack vector

Stored script execution via unescaped shortcode attributes

Published Dec 15, 2023 · Updated Apr 28, 2026

Stored XSS in N.O.U.S. Open Useful and Simple Event Post 5.8.6 and earlier allows remote authenticated users to run scripts in viewers' browsers. Shortcode handling neither sanitizes user-supplied attributes nor escapes them when generating page output, so injected script is stored with the post. Contributor-level access and a viewer opening the injected page are required; the script executes in that viewer's browser context.

CVSS severity5.4
Medium
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in N.O.U.S. Open Useful and Simple Event Post 5.8.6 and earlier allows remote authenticated users to run scripts in viewers' browsers. Shortcode handling neither sanitizes user-supplied attributes nor escapes them when generating page output, so injected script is stored with the post. Contributor-level access and a viewer opening the injected page are required; the script executes in that viewer's browser context.

The record

CVE
CVE-2023-49179
Published
Dec 15, 2023
Updated
Apr 28, 2026
Vendor
N.O.U.S. Open Useful and Simple
Product
Event Post
Classifications
CWE-79, CAPEC-592
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 15, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=n/a <=5.8.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

N.O.U.S. Open Useful and Simple · Event Postversion=n/a <=5.8.6

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
6.5PatchstackCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-592Stored XSS

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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