CVE-2018-25349Public exploitNetwork attack vector

Stored script execution via unsanitized forwarded IP

Published May 23, 2026 · Updated May 23, 2026

Stored cross-site scripting in UserSpice 4.3.24 allows remote attackers to execute script in an administrator's browser via HTTP requests. The backup.php endpoint records the X-Forwarded-For header in the audit log without neutralizing attacker-supplied markup for HTML output. Exploitation requires an administrator to visit the audit log page, where the stored payload executes with that browser session's privileges.

CVSS severity5.1
Medium
EPSS probability0.15%
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 UserSpice 4.3.24 allows remote attackers to execute script in an administrator's browser via HTTP requests. The backup.php endpoint records the X-Forwarded-For header in the audit log without neutralizing attacker-supplied markup for HTML output. Exploitation requires an administrator to visit the audit log page, where the stored payload executes with that browser session's privileges.

The record

CVE
CVE-2018-25349
Published
May 23, 2026
Updated
May 23, 2026
Vendor
UserSpice
Product
UserSpice
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 23, 2026CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=4.3.24

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

UserSpice · UserSpiceversion=4.3.24

Published CVSS scores

6.1VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
5.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA: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')
T1203Exploitation for Client Execution

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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