CVE-2026-11443Network attack vector

Stored script execution via malicious SVG attachment

Published Jun 12, 2026 · Updated Jun 12, 2026

Stored cross-site scripting in Alltena GmbH Allegra before 9.0 allows remote authenticated users to run script in another user’s session. A low-privileged user can upload a malicious SVG attachment, and downloadAttachment serves it so the browser executes embedded script in the application origin. Another user must download the attachment; the script then runs with that user’s Allegra session and can access session cookies, including an administrator’s.

CVSS severity4.6
Medium
EPSS probability0.82%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in Alltena GmbH Allegra before 9.0 allows remote authenticated users to run script in another user’s session. A low-privileged user can upload a malicious SVG attachment, and downloadAttachment serves it so the browser executes embedded script in the application origin. Another user must download the attachment; the script then runs with that user’s Allegra session and can access session cookies, including an administrator’s.

The record

CVE
CVE-2026-11443
Published
Jun 12, 2026
Updated
Jun 12, 2026
Vendor
Alltena GmbH
Product
Allegra
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 12, 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=8.1.6.22

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Alltena GmbH · Allegraversion=8.1.6.22

Published CVSS scores

4.6Zero Day InitiativeCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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