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Fencer Intel
medium 6.1

CVE-2025-45286 json

Reflected XSS in go-httpbin due to unrestricted client control over Content-Type

published last yr. modified 5d ago also GHSA-528q-4pgm-wvg2 , GO-2025-3554 , EUVD-2025-7205

cvss
6.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 18%
public exploits
0
none known

Summary

A cross-site scripting (XSS) vulnerability in mccutchen httpbin v2.17.1 allows attackers to execute arbitrary web scripts or HTML via a crafted payload.

Patch / fix

  • go github.com/mccutchen/go-httpbin 2.18.0
  • go github.com/mccutchen/go-httpbin/v2 2.18.0
  • httpbingo go-httpbin 2.18.0

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CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
10mo ago

Exploit prediction

0.27% chance of exploitation in the next 30 days, higher than 18% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • github.com https://github.com/mccutchen/go-httpbin/security/advisories/GHSA-528q-4pgm-wvg2 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CNA 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
go github.com/mccutchen/go-httpbin
<2.18.0
all versions
2.18.0
go github.com/mccutchen/go-httpbin/v2
<2.18.0
2.18.0

Classification

Weakness
  • CWE-80 Improper Neutralization of Script-Related HTML Tags in a Web Page
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.