Security Resilience

CVE-2026-2623

Path Traversal in Wangyunf Blossom ≤ 1.17.1

Public PoCPath Traversal
Published
17 February 2026
Modified
20 February 2026
CVSS Score v4 5.3
Click a component to see what it means
Raw vectorCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS Score 0.0092 60th percentile
Risk Priority 35 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.

Summary

CVE-2026-2623 is a medium-severity Path Traversal (CWE-22) vulnerability in Wangyunf Blossom. Its CVSS base score is 5.3 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique /etc/passwd and /etc/shadow (T1003.008); ranked in the top 40% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified map to AC-3 (Access Enforcement) and SI-10 (Information Input Validation) — see the control section below for these in your framework.

Deeper analysis AI-assisted summary

Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.

CVE-2026-2623 is a path traversal vulnerability (CWE-22) affecting Blossom versions up to 1.17.1. The flaw resides in the 'put' function within the file blossom-backend/common/common-iaas/src/main/java/com/blossom/common/iaas/blos/BLOSManager.java, part of the File Upload component. Published on 2026-02-17 with a CVSS v3.1 base score of 6.3 (AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L), it allows manipulation that enables attackers to traverse directories via crafted inputs.

The vulnerability can be exploited remotely by authenticated users with low privileges (PR:L). Attackers can initiate the exploit over the network with low complexity and no user interaction required, potentially achieving limited impacts on confidentiality, integrity, and availability. An exploit has been published and is available for use.

Advisories and details are available at referenced URLs including https://fx4tqqfvdw4.feishu.cn/docx/WmA3dzNfto3AxlxoFlqcu5amnXe and VulDB entries (https://vuldb.com/?ctiid.346274, https://vuldb.com/?id.346274, https://vuldb.com/?submit.751988). The vendor was contacted early about the disclosure but did not respond, and no patches or mitigations are mentioned in the available information.

OWASP Top 10 for Web (2025)

A01:2025 Broken Access Control

EU & UK References

Vulnerability Data

A flaw has been found in Blossom up to 1.17.1. This issue affects the function put of the file blossom-backend/common/common-iaas/src/main/java/com/blossom/common/iaas/blos/BLOSManager.java of the component File Upload. This manipulation causes path traversal. The attack may be initiated remotely. The exploit has been…

more

published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

CWE(s)
CWE-22

Related Threats

MITRE ATT&CK Enterprise Techniques

T1003.008 /etc/passwd and /etc/shadow Credential Access
Adversaries may attempt to dump the contents of <code>/etc/passwd</code> and <code>/etc/shadow</code> to enable offline password cracking.
attack.mitre.org →
T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2024-50649Shared CWE-22
CVE-2023-24416Shared CWE-22
CVE-2024-9935Shared CWE-22
CVE-2025-23084Shared CWE-22
CVE-2025-32631Shared CWE-22
CVE-2025-3486Shared CWE-22
CVE-2025-34508Shared CWE-22
CVE-2026-39844Shared CWE-22
CVE-2025-6265Shared CWE-22
CVE-2023-51646Shared CWE-22

Affected Assets

wangyunf
blossom
≤ 1.17.1

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V5.3.2

Mitigating Controls (NIST 800-53 r5) AI

AC-3 Access Enforcement good match

Enforces the intended directory access authorizations that path traversal would otherwise bypass.

SI-10 Information Input Validation good match

Input validation directly neutralizes special path elements before pathname construction occurs.

AC-6 Least Privilege partial match

Least privilege reduces the impact of any unauthorized file access obtained via traversal.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-02 partial match
blocks

Patching/maintenance can remediate known path-traversal flaws in deployed software (partial prevention of exploitability) but does nothing to stop the coding defect from being introduced in the first place.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing in development catches path traversal via static/dynamic analysis.

A.8.28 Secure coding partial match
prevents

Secure coding standards explicitly forbid unsafe path construction and mandate safe APIs.

References