CVE-2026-56696 json
OpenHarness - Prompt Injection via /issue and /pr_comments Slash Commands
published 4mo ago modified 3d ago also EUVD-2026-38469 , GHSA-24cw-228q-3rx9 , PYSEC-2026-3880
- cvss
- 5.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 31%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- github.com/HKUDS/OpenHarness@27bb93b commit
- github.com/HKUDS/OpenHarness#272 pull request
Is CVE-2026-56696 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 4mo ago
Exploit prediction
0.37% chance of exploitation in the next 30 days, higher than 31% of all scored CVEs (FIRST EPSS, 2026-11-11).
Exploits and checks
- github.com https://github.com/HKUDS/OpenHarness/pull/272 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 5.3 | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N |
| CNA | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N |
| GitHub | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N |
| CNA | 4.0 | 5.3 | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/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 |
| OSV | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | openharness-ai | <=0.1.9 |
no fix listed |
Affected products
- HKUDS OpenHarness
Classification
- Weakness
-
- CWE-862 Missing Authorization
References
-
github.com
/HKUDS/OpenHarness/pull/272
issue-tracking, patch, exploit, web
-
github.com
/HKUDS/OpenHarness/commit/27bb93b810e9ea8fa4832eab7152eeb3b4a6bffb
patch, web
-
vulncheck.com
/advisories/openharness-prompt-injection-via-issue-and-pr-comments-slash-commands
third-party-advisory, web
-
nvd.nist.gov
/vuln/detail/CVE-2026-56696
advisory
-
github.com
/HKUDS/OpenHarness
package
-
pypi.org
/project/openharness-ai
package
-
github.com
/advisories/GHSA-24cw-228q-3rx9
advisory
Sources
- CVE List CVE-2026-56696
- GitHub Advisory GHSA-24cw-228q-3rx9
- NVD CVE-2026-56696
- OSV PYSEC-2026-3880
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.