What’s Vulnerable › Vulnerabilities

CVE-2026-53598: Prompty: Arbitrary File Read via ${file:path} Reference Expansion

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-16 · updated 2026-10-24
• Weakness: CWE-22

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.

Affected products

• microsoft prompty: before 2.0.0-beta.2

References

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

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