CVE-2023-33961Network attack vector

Stored cross-site scripting via unsanitized comments

Published May 30, 2023 · Updated Jan 10, 2025

Stored cross-site scripting in Leantime 2.3.21 and earlier allows remote authenticated users to execute JavaScript through comments. The comment service in app/domain/comments/services/class.comments.php stores comment content without neutralizing script-related HTML before later browser rendering. Commenting privileges are required, and execution occurs when a user loads the malicious comment, exposing that user's browser session to attacker-controlled actions.

CVSS severity8.9
High
EPSS probability0.39%
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 Leantime 2.3.21 and earlier allows remote authenticated users to execute JavaScript through comments. The comment service in app/domain/comments/services/class.comments.php stores comment content without neutralizing script-related HTML before later browser rendering. Commenting privileges are required, and execution occurs when a user loads the malicious comment, exposing that user's browser session to attacker-controlled actions.

The record

CVE
CVE-2023-33961
Published
May 30, 2023
Updated
Jan 10, 2025
Vendor
Leantime
Product
Leantime
Classifications
CWE-79, CWE-80, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 30, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 10, 2025Record 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==> 2.3.21

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Leantime · Leantimeversion==> 2.3.21

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
8.9GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L

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')
CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
T1059.007Command and Scripting Interpreter: JavaScript

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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