CVE-2023-39521Network attack vector

Stored XSS via unescaped kanban deletion message

Published Aug 24, 2023 · Updated Oct 2, 2024

Stored XSS in affected Enalean Tuleap releases allows remote authenticated users to execute scripts through a malicious kanban label. The kanban deletion success message inserts the label into generated HTML without proper output escaping. An agile dashboard administrator must delete the labeled kanban, after which the script runs in that administrator's browser and can read or modify session-accessible data.

CVSS severity4.8
Medium
EPSS probability0.56%
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 affected Enalean Tuleap releases allows remote authenticated users to execute scripts through a malicious kanban label. The kanban deletion success message inserts the label into generated HTML without proper output escaping. An agile dashboard administrator must delete the labeled kanban, after which the script runs in that administrator's browser and can read or modify session-accessible data.

The record

CVE
CVE-2023-39521
Published
Aug 24, 2023
Updated
Oct 2, 2024
Vendor
Enalean
Product
Tuleap
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Aug 24, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Tuleap Community Edition < 14.11.99.28
  2. Affected versionversion=Tuleap Enterprise Edition < 14.10-6
  3. Affected versionversion=Tuleap Enterprise Edition >= 14.11, < 14.11-3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Enalean · Tuleapversion=Tuleap Community Edition < 14.11.99.28; version=Tuleap Enterprise Edition < 14.10-6; version=Tuleap Enterprise Edition >= 14.11, < 14.11-3

Published CVSS scores

4.8NISTCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
4.8GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:H/UI:R/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.

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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

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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