CVE-2025-2123Public exploitNetwork attack vector

Reflected XSS via unescaped stylesheet parameters

Published Mar 9, 2025 · Updated Mar 10, 2025

Cross-site scripting in GeSHi 1.0.9.1 and earlier allows remote attackers to inject script through CSS generator parameters. The contrib/cssgen.php get_var function returns request values that are concatenated directly into generated stylesheet rules without HTML escaping or sanitization. Exploitation requires the contrib script to be web-accessible and a user to view the crafted response, executing the injected script in that browser.

CVSS severity6.1
Medium
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in GeSHi 1.0.9.1 and earlier allows remote attackers to inject script through CSS generator parameters. The contrib/cssgen.php get_var function returns request values that are concatenated directly into generated stylesheet rules without HTML escaping or sanitization. Exploitation requires the contrib script to be web-accessible and a user to view the crafted response, executing the injected script in that browser.

The record

CVE
CVE-2025-2123
Published
Mar 9, 2025
Updated
Mar 10, 2025
Vendor
QBNZ
Product
GeSHi
Classifications
CWE-79, CWE-94, T1189
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Mar 9, 2025CVE publishedPublication date reported by the CVE source.
  2. Mar 10, 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=1.0.9.0
  2. Affected versionversion=1.0.9.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

QBNZ · GeSHiversion=1.0.9.0; version=1.0.9.1

Published CVSS scores

4.0VulDBAV:N/AC:L/Au:S/C:N/I:P/A:N
3.5VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
5.1VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
3.5VulDBCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:N/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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-94Improper Control of Generation of Code ('Code Injection')
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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