CVE-2023-4819Public exploitNetwork attack vector

Unauthenticated stored XSS via incorrect content type

Published Oct 16, 2023 · Updated Apr 23, 2025

Stored cross-site scripting in Tammersoft Shared Files before 1.7.6 allows remote attackers to execute scripts through an uploaded file. The file-view route serves an allowed-extension upload containing script markup without the correct Content-Type header, so the browser interprets it as active code. No authentication is required to place the payload, but execution requires a user to open the uploaded file's preview URL and occurs in that site's browser origin.

CVSS severity6.1
Medium
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in Tammersoft Shared Files before 1.7.6 allows remote attackers to execute scripts through an uploaded file. The file-view route serves an allowed-extension upload containing script markup without the correct Content-Type header, so the browser interprets it as active code. No authentication is required to place the payload, but execution requires a user to open the uploaded file's preview URL and occurs in that site's browser origin.

The record

CVE
CVE-2023-4819
Published
Oct 16, 2023
Updated
Apr 23, 2025
Vendor
Tammersoft
Product
Shared Files
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 16, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 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?

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

  1. Affected versionversion=0 <1.7.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Tammersoft · Shared Filesversion=0 <1.7.6

Published CVSS scores

6.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.1NIST NVDCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

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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