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Ssti CVE-2026-5559

| EUVD-2026-19066 LOW
Improper Neutralization of Special Elements Used in a Template Engine (CWE-1336)
2026-04-05 VulDB GHSA-23jg-5f8m-gw8c
2.1
CVSS 4.0

CVSS VectorNVD

CVSS: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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

6
Severity Changed
Apr 29, 2026 - 01:11 NVD
MEDIUM LOW
CVSS changed
Apr 29, 2026 - 01:11 NVD
5.3 (MEDIUM) 2.1 (LOW)
PoC Detected
Apr 07, 2026 - 13:20 vuln.today
Public exploit code
EUVD ID Assigned
Apr 05, 2026 - 10:30 euvd
EUVD-2026-19066
Analysis Generated
Apr 05, 2026 - 10:30 vuln.today
CVE Published
Apr 05, 2026 - 10:15 nvd
MEDIUM 5.3

DescriptionNVD

A vulnerability has been found in AntaresMugisho PyBlade 0.1.8-alpha/0.1.9-alpha. The affected element is the function _is_safe_ast of the file sandbox.py of the component AST Validation. Such manipulation leads to improper neutralization of special elements used in a template engine. The attack may be performed from remote. The exploit has been disclosed to the public and may be used. The project was informed of the problem early through an issue report but has not responded yet.

AnalysisAI

Server-side template injection in PyBlade's AST validation function (_is_safe_ast in sandbox.py) allows authenticated remote attackers to bypass template safety checks and inject arbitrary template code, leading to information disclosure and potential code execution. Affected versions 0.1.8-alpha and 0.1.9-alpha contain improper neutralization of special template elements. …

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CVE-2026-5559 vulnerability details – vuln.today

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