CVE-2026-19988Public exploitNetwork attack vector

Popup UI injection via innerHTML rendering

Published Aug 17, 2026 · Updated Aug 18, 2026

Cross-site scripting in Alaev & Co Alaev SEO Tools 1.0.10 and earlier allows remote attackers to alter popup UI content via crafted page SEO fields. In src/popup.html, the popup requests title, description, keywords, and headings from the active tab and the addDiv helper writes those page-controlled strings to innerHTML; headings are likewise rendered with F.innerHTML = D.textContent ?? "". Exploitation requires a user to open the extension popup while visiting a malicious page, and the public proof describes trusted-UI markup injection rather than confirmed extension-context script execution.

CVSS severity4.3
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

Cross-site scripting in Alaev & Co Alaev SEO Tools 1.0.10 and earlier allows remote attackers to alter popup UI content via crafted page SEO fields. In src/popup.html, the popup requests title, description, keywords, and headings from the active tab and the addDiv helper writes those page-controlled strings to innerHTML; headings are likewise rendered with F.innerHTML = D.textContent ?? "". Exploitation requires a user to open the extension popup while visiting a malicious page, and the public proof describes trusted-UI markup injection rather than confirmed extension-context script execution.

The record

CVE
CVE-2026-19988
Published
Aug 17, 2026
Updated
Aug 18, 2026
Vendor
Alaev & Co
Product
Alaev SEO Tools
Classifications
CWE-74, CWE-80
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 18, 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=1.0.0
  2. Affected versionversion=1.0.1
  3. Affected versionversion=1.0.10
  4. Affected versionversion=1.0.2
  5. Affected versionversion=1.0.3
  6. Affected versionversion=1.0.4
  7. Affected versionversion=1.0.5
  8. Affected versionversion=1.0.6
  9. Affected versionversion=1.0.7
  10. Affected versionversion=1.0.8
  11. Affected versionversion=1.0.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Alaev & Co · Alaev SEO Toolsversion=1.0.0; version=1.0.1; version=1.0.10; version=1.0.2; version=1.0.3; version=1.0.4; version=1.0.5; version=1.0.6; version=1.0.7; version=1.0.8; version=1.0.9

Published CVSS scores

5.0VulDBAV:N/AC:L/Au:N/C:N/I:P/A:N
4.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:R/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.

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-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)

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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