CVE-2026-56696
MEDIUMOpenHarness - Prompt Injection via /issue and /pr_comments Slash Commands
Title source: cnaDescription
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.
References (3)
Core 3
Core References
Patch patch
Patch Commit
https://github.com/HKUDS/OpenHarness/commit/27bb93b810e9ea8fa4832eab7152eeb3b4a6bffb
Third Party Advisory third-party-advisory
https://www.vulncheck.com/advisories/openharness-prompt-injection-via-issue-and-pr-comments-slash-commands
Scores
CVSS v3
5.4
EPSS
0.0022
EPSS Percentile
12.1%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
partial
Details
CWE
CWE-862
Status
published
Products (2)
HKUDS/OpenHarness
< 0.1.9
HKUDS/OpenHarness
27bb93b810e9ea8fa4832eab7152eeb3b4a6bffb
Published
Jun 23, 2026
Tracked Since
Jun 23, 2026