OpenClaw v2026.4.8: Critical Security Fixes & Claude Thinking Blocks for B2B Sales AI
Released: April 8, 2026 | Upgrade priority: Critical
OpenClaw v2026.4.8 is a must-install release. It closes 5 security vulnerabilities, fixes Claude reasoning regressions that were silently hurting complex SDR tasks, and extends enterprise deployment support with corporate proxy compatibility for Slack. Here's everything that changes for your B2B sales agent.
⚠️ Security: Upgrade Immediately
This release contains 5 security patches that affect every OpenClaw deployment:
1. Auth Token Leakage via Cross-Origin Redirects (Critical)
307/308 HTTP redirects previously forwarded request bodies and headers — including Authorization tokens and API keys — to the redirect target. In SSRF-adjacent scenarios (outbound web fetch, webhook calls), this could expose your CRM API keys, LLM provider tokens, or customer data to unexpected destinations.
After v2026.4.8: redirect bodies and auth headers are dropped by default. No configuration change required.
2. Allowlist Bypass Under Concurrent Requests
The /allowlist command owner-check was applied before channel resolution but not during. Under fast concurrent requests, allowlist mutations could slip past the guard. Now enforced both before and during channel resolution.
3. Base64 Payload Memory Exhaustion
Teams, Signal, QQ, and image-tool endpoints now enforce byte-size caps before base64 decoding. Previously, an oversized payload could exhaust server memory — especially on VPS deployments with limited RAM.
4. Untrusted Event Contamination
Background summaries, ACP relay payloads, and wake-hook events are now tagged as untrusted and excluded from elevated execution contexts. This prevents injected content in automated pipelines from gaining escalated tool access.
5. Windows cmd.exe Approval Gate
Env-assignment carriers inside cmd.exe wrappers are now caught by the approval gate even when ambient defaults are elevated. Relevant for Windows-hosted deployments.
Upgrade command:
npm install -g openclaw@latest
# or
npx openclaw@latest upgrade
🧠 Claude Thinking Blocks Restored
This is the fix many users didn't know they needed.
OpenClaw was silently stripping interleaved thinking blocks before forwarding to Claude Opus 4.5+, Sonnet 4.5+, and all Claude 4-family models. The result: complex multi-step reasoning tasks — BANT qualification chains, multi-objection handling, competitive pricing analysis — were getting shorter, shallower responses without the model's full reasoning capacity.
After v2026.4.8: thinking blocks are preserved and forwarded correctly. No config change needed. Expect noticeably better responses on:
- Complex objection handling (multiple competing objections in one message)
- BANT qualification with ambiguous budget signals
- Competitive differentiation when buyers mention 3+ alternatives
- Pricing negotiation with multi-tier discount logic
If you're running Claude Opus 4.5+ or any Claude 4 model, this alone justifies the upgrade.
🔌 Telegram Multi-Account Setup Fixed
Running multiple Telegram bots (one per market, one per product line, or one per sales territory)? After npm install -g, setup contracts were failing to import from missing dist files, breaking gateway startup entirely.
After v2026.4.8: setup and secret contracts load from bundled sidecars. Multi-account setups survive fresh npm installs cleanly.
Practical impact for B2B SDR teams:
- Russia/CIS sales bot + MENA sales bot + EU sales bot: all start reliably
- Per-market language models and action gates work without manual file patching
openclaw doctorno longer drops inherited allowlists during multi-account normalization
🏢 Slack Now Works Behind Corporate Proxies
Slack's Socket Mode WebSocket connections now respect HTTP_PROXY, HTTPS_PROXY, and NO_PROXY environment variables. If your server sits behind a corporate HTTP proxy, you no longer need workarounds or custom network rules.
export HTTPS_PROXY="http://proxy.corp.example.com:3128"
export NO_PROXY="localhost,127.0.0.1,*.internal.corp"
OpenClaw picks these up automatically. This unblocks Slack-channel deployments in enterprise environments, government networks, and heavily firewalled cloud VPCs — exactly the environments where B2B enterprise buyers operate.
📊 Context Overflow Recovery for Long SDR Threads
Long B2B sales conversations accumulate: BANT qualification, pricing discussions, objection loops, follow-up summaries. OpenClaw's context overflow recovery now combines oversized and aggregate tool-result recovery in a single pass with a total-context backstop.
Previously, runaway token accumulation could cause mid-thread failures. Now the recovery is deterministic — one pass handles both the immediate overflow and prevents cascading growth.
⚙️ Pluggable Compaction Provider
You can now offload session compaction to a different (cheaper) model without changing your main conversation model:
agents:
defaults:
compaction:
provider: "claude-haiku-4-5"
For high-volume SDR deployments running Claude Opus 4.6 as the main model, this can meaningfully reduce infrastructure costs — compaction summaries don't need full Opus capability.
📦 Other Fixes Worth Knowing
| Area | Fix |
|---|---|
| Matrix | Multi-paragraph and loose-list rendering repaired |
| Discord | Cover images now accept URLs or local PNG/JPG/GIF |
| xAI/Grok | api.grok.x.ai recognized as native endpoint |
| Mistral | reasoning_effort sent for Mistral Small 4 with thinking-level mapping |
| Gateway cron | jobId loaded from disk on restart — no more "unknown cron job id" errors |
| HTTP clients | In-flight chat-completions aborted on client disconnect (no orphaned API calls) |
| Model selection | Explicitly selected session models no longer switch mid-session |
🚀 Quick Upgrade Guide
# 1. Update OpenClaw
npm install -g openclaw@latest
# 2. Or use PulseAgent's managed template (always current)
curl -fsSL https://raw.githubusercontent.com/iPythoning/b2b-sdr-agent-template/main/install.sh | bash
# 3. Restart gateway
openclaw gateway restart
Managed on PulseAgent? Your agent is updated automatically — no manual steps needed.
PulseAgent: Run OpenClaw Without the DevOps
PulseAgent hosts and manages your OpenClaw-powered B2B sales agent — security patches applied automatically, zero server management.
| Feature | Self-hosted OpenClaw | PulseAgent |
|---|---|---|
| Security patch time | Manual, whenever you update | Automatic within 24h |
| Multi-channel (WhatsApp + Telegram + Slack) | Manual config | Pre-configured |
| Claude model updates | Manual | Automatic |
| Uptime monitoring | DIY | Included |
| Support | Community | Dedicated |
Start Free on PulseAgent → | View Pricing
FAQ
Q: Do I need to change any config for the security fixes? No. All 5 security patches are automatic after upgrade. Redirect behavior and event tagging are handled internally.
Q: Will the Claude thinking block fix change my agent's behavior? Yes — for the better. Responses on complex tasks will be more thorough. If you have hardcoded response-length expectations in tests, they may need updating.
Q: My Telegram multi-account setup was working. Do I still need to upgrade? Yes, for the security patches. The Telegram fix is a bonus.
Q: Does the Slack proxy support require any OpenClaw config?
No — just set the standard HTTPS_PROXY / NO_PROXY env vars. OpenClaw reads them automatically.
Q: How do I use the compaction provider feature?
Add agents.defaults.compaction.provider to your workspace config. Any provider OpenClaw supports works — Claude Haiku 4.5 is the recommended cost-efficient option.
Related Reading
- WhatsApp Sales Automation for B2B Export
- AI SDR for B2B Export
- Telegram Lead Generation
- Multi-Channel Sales Pipeline
- AI Sales Agent for Manufacturing
PulseAgent automates your B2B outreach across WhatsApp, Telegram, and Slack — powered by OpenClaw and Claude.
