Cyber Resilience

CVE-2025-27156

Medium

Published: 04 March 2025

Published
04 March 2025
Modified
22 August 2025
KEV Added
—
Patch
—
CVSS Score v3.1 4.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N
EPSS Score 0.0070 72.6th percentile
Risk Priority 9 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-27156 is a medium-severity Cross-site Scripting (CWE-79) vulnerability in Enalean Tuleap. Its CVSS base score is 4.1 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Client Execution (T1203); ranked in the top 27.4% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

Tuleap is an Open Source Suite to improve management of software developments and collaboration. The mass emailing features do not sanitize the content of the HTML emails. A malicious user could use this issue to facilitate a phishing attempt or…

more

to indirectly exploit issues in the recipients mail clients. This vulnerability is fixed in Tuleap Community Edition 16.4.99.1740567344 and Tuleap Enterprise Edition 16.4-6 and 16.3-11.

CWE(s)
CWE-79

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1203 Exploitation for Client Execution Execution
Adversaries may exploit software vulnerabilities in client applications to execute code.
attack.mitre.org →
T1534 Internal Spearphishing Lateral Movement
After they already have access to accounts or systems within the environment, adversaries may use internal spearphishing to gain access to additional information or compromise other users within the same organization.
attack.mitre.org →
T1659 Content Injection Initial Access
Adversaries may gain access and continuously communicate with victims by injecting malicious content into systems through online network traffic.
attack.mitre.org →
Why these techniques?

Vulnerability allows authenticated users to inject unsanitized HTML content into mass emails, facilitating internal spearphishing (T1534), content injection (T1659), and indirect exploitation of recipient email client vulnerabilities (T1203).

Affected Assets

enalean
tuleap
≤ 16.3-11 · ≤ 16.4.99.1740567344 · 16.4 — 16.4-6

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

CA-8 Penetration Testing
addresses: CWE-79

Penetration testing submits XSS payloads to web applications, detecting cross-site scripting flaws for subsequent remediation.

SI-10 Information Input Validation
addresses: CWE-79

Validates web inputs to reject script-related content that could produce XSS.

SI-15 Information Output Filtering
addresses: CWE-79

Output validation against expected content can reject or sanitize script content in generated web pages, reducing XSS exploitability.

References