CVE-2026-53598 | Prompty is a markdown file format (.prompty) for LLM prompts… | CVSS 7.5 HIGH

Description

Prompty is a markdown file format (.prompty) for LLM prompts. Prior to 2.0.0-beta.2, Prompty loaders expanded ${file:...} references in .prompty frontmatter without enforcing that resolved paths stayed within the prompt directory or allowed roots, allowing an attacker-controlled prompt file to read local files through absolute paths, .. traversal, or symlink escapes. This issue is fixed in versions 2.0.0-beta.2.

Metadata

CVE ID: CVE-2026-53598
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-06-09 19:39 UTC
Published: 2026-07-16 14:59 UTC
Last updated: 2026-07-17 14:06 UTC
Primary CWE: CWE-22
CWE-22: Improper Limitation of a Pathname to a Restricted Di…
Vendor / Product: microsoft / prompty
Sources: cve.org · NVD

Severity & Metrics

7.5 HIGH CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

SSVC — CISA Coordinator

Exploitation: none
Automatable: yes
Tech. Impact: partial

Affected products (1)

Vendor	Product	Platform	Versions
microsoft	prompty	—	< 2.0.0-beta.2

Weakness (CWE)

CWE	Source	Description
CWE-200	cna	CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
CWE-22	cna	CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSS scores (1)

Score	Severity	Version	Source	Vector
7.5	HIGH	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References (2)

https://github.com/microsoft/prompty/security/advisories/GHSA-wxhm-2mq7-7697 https://github.com/microsoft/prompty/security/advisories/GHSA-wxhm-2mq7-7697
https://github.com/microsoft/prompty/commit/88ac9948d7d37995edbb2f6d36913436626c39e1 https://github.com/microsoft/prompty/commit/88ac9948d7d37995edbb2f6d36913436626c39e1