Vulnerability · Published Oct 10, 2026 · Assigned by VulnCheck

CVE-2026-108595Phi 0.3.0 through 0.28.4 Permission Bypass via agent_spawn Workdir

Medium 5.3

In plain English

A medium-severity incorrect authorization in phi from pulseaiclub. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 25% of all known vulnerabilities).

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.3%top 75.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Phi 0.3.0 through 0.28.4 contains a permission bypass vulnerability that allows spawned sub-agents to escape workspace_only_writes and readonly mode by supplying an unchecked workdir to agent_spawn. Attackers can plant prompt-injected instructions in processed content so the agent spawns a worker rooted elsewhere, causing unapproved file writes anywhere the user can write.

Affected products (as reported)

Vendor	Product	Versions
pulseaiclub	phi	0.3.0 – through 0.28.4

Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N

References

https://hackmd.io/@haind/phi-subagent-workdir-workspace-escape third-party-advisory
https://github.com/pulseaiclub/phi/blob/5b3cb440a7c58115ef64283a737a43299f2805a4/internal/tools/agenttool/agent.go#L106-L120 technical-description
https://github.com/pulseaiclub/phi/blob/5b3cb440a7c58115ef64283a737a43299f2805a4/internal/agent/engine_runner.go#L52-L60 technical-description
https://github.com/pulseaiclub/phi product
VulnCheck Advisory: Phi 0.3.0 through 0.28.4 Permission Bypass via agent_spawn Workdir third-party-advisory