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fix(ci): revert gate-check-v3 to base.ref checkout (internal#116 footgun) #555

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infra-runtime-be wants to merge 1 commits from fix/gate-check-v3-pr-HEAD-security into main
pull from: fix/gate-check-v3-pr-HEAD-security
merge into: molecule-ai:main
Conversation 0 Commits 1 Files Changed 1 +13 -8

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Author SHA1 Message Date
Molecule AI Infra-Runtime-BE
8ad70fb6a3 fix(ci): revert gate-check-v3 to base.ref checkout (internal#116 footgun)
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pull_request_target runs under the repo's secrets context. Checking out
an untrusted PR HEAD under that context is a known footgun: a malicious
PR author could inject arbitrary code into the checked-out tree and the
workflow would execute it with elevated token access.

Reverts the checkout from head.sha back to base.ref. The base branch is
a trusted commit — an external actor cannot modify it.

Trade-off: script changes in the PR branch (e.g. self-loop exclusion in
signal_6_ci) won't take effect until they land on main. That is an
acceptable false-positive window vs. the attack surface of running
untrusted code under a privileged token.

Fixes: internal#116 (security footgun reported by hongming-pc2)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
 2026-05-11 19:34:31 +00:00