PT-2026-51534 · Hkuds · Openharness

Chia Min + 1 · Published 2026-06-23 · Updated 2026-06-23 · CVE-2026-56696

Mitre

CVSS v3.1

5.4

Medium

Base vector

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

OpenHarness /issue and /pr comments slash commands lack remote invocable=False protection, allowing remote channel senders to write attacker-controlled Markdown into project context files. Admitted remote attackers can inject malicious content into .openharness/issue.md and .openharness/pr comments.md files, which are subsequently injected into runtime system prompts, persistently influencing local agent behavior.

Exploit

Fix

Missing Authorization

Weakness Enumeration

CWE-862

Related Identifiers

CVE-2026-56696

Affected Products

Openharness

References · 4

• 🔥 https://github.com/HKUDS/OpenHarness/pull/272 · Exploit
• https://github.com/HKUDS/OpenHarness/commit/27bb93b810e9ea8fa4832eab7152eeb3b4a6bffb · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-56696 · Security Note
• https://vulncheck.com/advisories/openharness-prompt-injection-via-issue-and-pr-comments-slash-commands · Note