CVE-2026-16640Network attack vector

Reflected XSS via unvalidated test-script input

Published Aug 25, 2026 · Updated Aug 25, 2026

Reflected XSS in Drupal Search API Autocomplete before 1.12.0 allows remote attackers to execute script through an anonymously accessible test script. The search_api_autocomplete_test_custom_autocomplete_callback() endpoint accepts invalid input, and PHP warning output reflects that input without safe handling. Exploitation requires displayed warning messages and user interaction, allowing script execution in the affected page's browser context.

CVSS severity6.1
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

Reflected XSS in Drupal Search API Autocomplete before 1.12.0 allows remote attackers to execute script through an anonymously accessible test script. The search_api_autocomplete_test_custom_autocomplete_callback() endpoint accepts invalid input, and PHP warning output reflects that input without safe handling. Exploitation requires displayed warning messages and user interaction, allowing script execution in the affected page's browser context.

The record

CVE
CVE-2026-16640
Published
Aug 25, 2026
Updated
Aug 25, 2026
Vendor
OAuth.js
Product
Search API Autocomplete
Classifications
CWE-79, CAPEC-591, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 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=0.0.0 <1.12.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OAuth.js · Search API Autocompleteversion=0.0.0 <1.12.0

Published CVSS scores

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 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 exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-591Reflected XSS
T1203Exploitation for Client Execution

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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