CVE-2025-45286Public exploitNetwork attack vector

Reflected XSS via attacker-controlled response Content-Type

Published Jan 2, 2026 · Updated Jan 2, 2026

Reflected XSS in mccutchen go-httpbin before 2.18.0 allows remote attackers to run scripts in a victim's browser. The ResponseHeaders and Base64 handlers accept a client-selected HTML Content-Type while returning attacker-controlled body data without HTML escaping. Exploitation requires a victim to open a crafted URL, after which script execution is limited to the browser context of that response.

CVSS severity6.1
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in mccutchen go-httpbin before 2.18.0 allows remote attackers to run scripts in a victim's browser. The ResponseHeaders and Base64 handlers accept a client-selected HTML Content-Type while returning attacker-controlled body data without HTML escaping. Exploitation requires a victim to open a crafted URL, after which script execution is limited to the browser context of that response.

The record

CVE
CVE-2025-45286
Published
Jan 2, 2026
Updated
Jan 2, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, CWE-80, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 2, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

1.3GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U
6.1CISA-ADPCVSS: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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
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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