GHSA-xqq2-4j46-vwp7 · Severity: medium · Ecosystem: go — PinchTab has Unauthenticated Blind SSRF in Task Scheduler via Unvalidated callbackUrl
PinchTab is a standalone HTTP server that gives AI agents direct control over a Chrome browser. PinchTab v0.8.3 contains a server-side request forgery issue in the optional scheduler's webhook delivery path. When a task is submitted to `POST /tasks` with a user-controlled `callbackUrl`, the v0.8.3 scheduler sends an outbound HTTP `POST` to that URL when the task reaches a terminal state. In that release, the webhook path validated only the URL scheme and did not reject loopback, private, link-local, or other non-public destinations. Because the v0.8.3 implementation also used the default HTTP client behavior, redirects were followed and the destination was not pinned to validated IPs. This allowed blind SSRF from the PinchTab server to attacker-chosen HTTP(S) targets reachable from the server. This issue is narrower than a general unauthenticated internet-facing SSRF. The scheduler is optional and off by default, and in token-protected deployments the attacker must already be able to submit tasks using the server's master API token. In PinchTab's intended deployment model, that token represents administrative control rather than a low-privilege role. Tokenless deployments lower the barrier further, but that is a separate insecure configuration state rather than impact created by the webhook bug itself. PinchTab's default deployment model is local-first and user-controlled, with loopback bind and token-based access in the recommended setup. That lowers practical risk in default use, even though it does not remove the underlying webhook issue when the scheduler is enabled and reachable. This was addressed in v0.8.4 by validating callback targets before dispatch, rejecting non-public IP ranges, pinning delivery to validated IPs, disabling redirect following, and validating `callbackUrl` during task submission.
Conclusion & alert: CVE-2026-33619 is rated Exploit Available (50/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.06%). Core evidence: 1 public exploit reference(s) are indexed (Exploit-DB). Mandatory action: Public exploits are available—assess exposure, apply mitigations, and prioritize patching.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
| EDB-ID | Source | Kind | Published | Link |
|---|---|---|---|---|
| — | nvd_ref | exploit_tag | Exploit-DB ↗ |
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-05-07 | 0.02% | 0.06% | +0.04% |
| 2 | 2026-03-27 | — | 0.02% | — |
Full EPSS history (2 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 4.1 | 3.1 | MEDIUM |
|
2.3 | 1.4 | [email protected] |
| 5.5 | 3.1 | MEDIUM |
|
2.3 | 2.7 | [email protected] |
GHSA-xqq2-4j46-vwp7 · Severity: medium · Ecosystem: go — PinchTab has Unauthenticated Blind SSRF in Task Scheduler via Unvalidated callbackUrl
| URL | Tags |
|---|---|
| https://github.com/pinchtab/pinchtab/commit/c824574c3a05073dec2f5e9c219e22ffff8de445 | Patch |
| https://github.com/pinchtab/pinchtab/releases/tag/v0.8.4 | Release Notes |
| https://github.com/pinchtab/pinchtab/security/advisories/GHSA-xqq2-4j46-vwp7 | Exploit Mitigation Vendor Advisory |