GHSA-999R-QQ7V-R334

yt-dlp: Arbitrary command injection possible if --exec option used with yt-dlp

Deno: Command Injection via spawnSync & spawn on Windows

Poisoned Pipeline Execution is the class of attack in which an actor with write access to source control, but no direct access to the build environment, injects attacker-controlled commands that the CI pipeline then executes with its own privileges, secrets, and tokens. Direct PPE (D-PPE) modifies the CI configuration file itself (for example .github/workflows, .gitlab-ci.yml, or a Jenkinsfile) by pushing to an unprotected branch or opening a pull request, so the new pipeline steps run on trigger. Indirect PPE (I-PPE) instead poisons files the pipeline already references, such as a Makefile, test harness, build script, or linter config, when the config is protected but the referenced code is not. Public PPE (3PE) abuses public and open-source repositories that run unreviewed code from anonymous fork pull requests, frequently via the dangerous pull_request_target trigger that grants the fork workflow access to repository secrets. The pattern is catalogued as CICD-SEC-4 in the OWASP Top 10 CI/CD Security Risks (published September 2022) and in Cider/Legit Security research, with real cases including public-repo PPE in popular projects and GitHub Actions workflows abused for cryptocurrency mining.

GitHub Security Lab documented (initial guidance August 20, 2020, updated since) a widespread GitHub Actions vulnerability class in which attacker-controlled event fields interpolated into run shell steps cause command execution. Because expressions in double-brace syntax are evaluated and substituted into the temporary shell script before the runner executes it, embedding an untrusted field such as github.event.issue.title or github.event.pull_request.head_ref directly in a run block lets the attacker break out of the intended command. An attacker who simply opens an issue or PR with a title containing a quote and a shell payload (for example a backtick command-substitution or a semicolon-curl sequence) executes arbitrary commands on the runner, reading environment variables and exfiltrating GITHUB_TOKEN and repository secrets to an external host. This is expression/script injection via untrusted github.event input, found across a large number of public-repo workflows. The fix is to never interpolate untrusted context into a shell; pass it through an intermediate quoted environment variable so it is treated as data, not script.

CakePHP Authentication: Open redirect weakness via backslash bypass

Avo: Missing Authorization in Avo Association Attach Endpoint Allows Unauthorized Relationship Manipulation and Privilege Escalation