CVE-2026-34206Network attack vector

Script execution via unescaped challenge destination

Published Mar 31, 2026 · Updated Mar 31, 2026

Reflected XSS in LibOps Captcha Protect before 1.12.2 allows remote attackers to execute script via a crafted challenge URL. The challenge renderer inserts the client-supplied destination into a hidden input with Go text/template, which lacks contextual HTML escaping. Exploitation requires a non-inline challenge URL and victim interaction; injected JavaScript runs in the protected application's origin.

CVSS severity6.1
Medium
EPSS probability0.19%
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 LibOps Captcha Protect before 1.12.2 allows remote attackers to execute script via a crafted challenge URL. The challenge renderer inserts the client-supplied destination into a hidden input with Go text/template, which lacks contextual HTML escaping. Exploitation requires a non-inline challenge URL and victim interaction; injected JavaScript runs in the protected application's origin.

The record

CVE
CVE-2026-34206
Published
Mar 31, 2026
Updated
Mar 31, 2026
Vendor
LibOps
Product
Captcha Protect
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 31, 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=< 1.12.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

LibOps · Captcha Protectversion=< 1.12.2

Published CVSS scores

6.1GitHub, Inc.CVSS: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.

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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 exploitUnconfirmed

Weakness, pattern, technique

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

Public exploit references

No public exploit references are available in this record.

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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