CVE-2026-40353Public exploitNetwork attack vector

Stored XSS via unescaped license attribution fields

Published Apr 17, 2026 · Updated Apr 17, 2026

Stored XSS in wger before 2.5 allows remote authenticated users to execute JavaScript in visitors' browsers through crafted ingredient data. The AbstractLicenseModel.attribution_link property interpolates license_author and related fields into raw HTML, and ingredient templates mark the result safe instead of applying Django auto-escaping. Any authenticated non-temporary account can store the payload; execution occurs when another user, including an unauthenticated visitor, opens the affected public ingredient page.

CVSS severity5.1
Medium
EPSS probability0.21%
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 wger before 2.5 allows remote authenticated users to execute JavaScript in visitors' browsers through crafted ingredient data. The AbstractLicenseModel.attribution_link property interpolates license_author and related fields into raw HTML, and ingredient templates mark the result safe instead of applying Django auto-escaping. Any authenticated non-temporary account can store the payload; execution occurs when another user, including an unauthenticated visitor, opens the affected public ingredient page.

The record

CVE
CVE-2026-40353
Published
Apr 17, 2026
Updated
Apr 17, 2026
Vendor
wger Project
Product
wger
Classifications
CWE-79, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 17, 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=< 2.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

wger Project · wgerversion=< 2.5

Published CVSS scores

5.4NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
5.1GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA: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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

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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