CVE-2026-13604Public exploitNetwork attack vector

Unauthenticated event injection via public AJAX nonce

Published Aug 1, 2026 · Updated Aug 1, 2026

Server-side event injection in HasThemes Pixelavo before 1.5.4 allows remote attackers to submit forged Facebook conversion events. Pixelavo's unauthenticated pixelavo_event AJAX action accepts client-supplied event data after checking only a nonce published on every configured site's front end, then forwards the data through Facebook's Conversions API with the administrator's stored token. The normal server-side tracking setup must contain a Facebook pixel and access token; successful requests pollute advertising data and consume API quota.

CVSS severity5.3
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-side event injection in HasThemes Pixelavo before 1.5.4 allows remote attackers to submit forged Facebook conversion events. Pixelavo's unauthenticated pixelavo_event AJAX action accepts client-supplied event data after checking only a nonce published on every configured site's front end, then forwards the data through Facebook's Conversions API with the administrator's stored token. The normal server-side tracking setup must contain a Facebook pixel and access token; successful requests pollute advertising data and consume API quota.

The record

CVE
CVE-2026-13604
Published
Aug 1, 2026
Updated
Aug 1, 2026
Vendor
HasThemes
Product
Pixelavo
Classifications
CWE-918, CAPEC-664, T1565.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 1, 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 <1.5.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

HasThemes · Pixelavoversion=0 <1.5.4

Published CVSS scores

5.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/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.

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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 exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
CAPEC-664Server Side Request Forgery
T1565.002Transmitted Data Manipulation

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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