CVE-2023-31285Public exploitNetwork attack vector

Stored XSS via permitted HTML temporary uploads

Published Apr 27, 2023 · Updated Feb 13, 2025

Stored XSS in Serenity Serene and StartSharp before 6.7.0 allows remote authenticated users to run scripts via temporary uploads. The temporary-upload handler accepts .html and .htm files and serves them from the application origin, so embedded JavaScript executes with the victim's session context. A low-privileged account can upload the payload, but an administrator must follow the resulting link; the script can perform application actions as that administrator.

CVSS severity6.1
Medium
EPSS probability0.78%
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 Serenity Serene and StartSharp before 6.7.0 allows remote authenticated users to run scripts via temporary uploads. The temporary-upload handler accepts .html and .htm files and serves them from the application origin, so embedded JavaScript executes with the victim's session context. A low-privileged account can upload the payload, but an administrator must follow the resulting link; the script can perform application actions as that administrator.

The record

CVE
CVE-2023-31285
Published
Apr 27, 2023
Updated
Feb 13, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1566.002
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 27, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.1GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

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 exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1566.002Phishing: Spearphishing Link

Public exploit references

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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