CVE-2026-1379Network attack vector

Administrator-level stored XSS via unescaped directive rendering

Published Apr 22, 2026 · Updated Apr 22, 2026

Stored XSS in Dimitar Ivanov HTTP Headers 1.19.4 and earlier allows remote authenticated users to execute scripts via custom headers. The Manual settings view writes Apache and Nginx directive arrays into HTML textarea elements with raw join output, allowing a stored value to terminate the textarea and inject script markup. Administrator access is required, and exposure is limited to multisite installations or sites where unfiltered_html is disabled.

CVSS severity4.4
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Dimitar Ivanov HTTP Headers 1.19.4 and earlier allows remote authenticated users to execute scripts via custom headers. The Manual settings view writes Apache and Nginx directive arrays into HTML textarea elements with raw join output, allowing a stored value to terminate the textarea and inject script markup. Administrator access is required, and exposure is limited to multisite installations or sites where unfiltered_html is disabled.

The record

CVE
CVE-2026-1379
Published
Apr 22, 2026
Updated
Apr 22, 2026
Vendor
Dimitar Ivanov
Product
HTTP Headers
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Apr 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 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 <=1.19.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Dimitar Ivanov · HTTP Headersversion=0 <=1.19.2

Published CVSS scores

4.4WordfenceCVSS:3.1/AV:N/AC:H/PR:H/UI:N/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript

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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