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271 Bugs in One Browser Pass - TCR 04/22/26
Anthropic’s Claude Mythos Preview identified 271 security vulnerabilities in Firefox 150’s unreleased source code - twelve times what the previous best model found in the same browser one month earlier - and Mozilla patched every one before it shipped.
https://sharedsapience.com/the-century-report-april-22-2026/
Firefox CTO Bobby Holley compared Mythos’s work to “elite security researchers” and described the current moment as “finite” - for the first time, the speed of vulnerability discovery has overtaken the speed of vulnerability accumulation in production software. Engineering leaders at major companies are pulling thousands of engineers off projects for six-month security audits. The open question is how under-resourced open-source projects maintained by volunteers will access the same capability, given that much of the internet’s infrastructure depends on them.
The same day, Anthropic confirmed it is investigating unauthorized access to Mythos Preview through a third-party contractor’s credentials - a containment breach that occurred within hours of the restricted Project Glasswing release. The administration told CNBC it had “very good talks” with Anthropic and that the company “can be of great use,” completing a reversal from the Pentagon’s supply-chain risk designation six weeks ago. Capability of this specificity reshapes political positions faster than those positions can hold.
Meta began installing software on U.S. employees’ computers that captures keystrokes, mouse movements, and periodic screenshots to train autonomous AI agents - while simultaneously planning to lay off 10% of its workforce starting May 20. CTO Andrew Bosworth’s memo describes agents that “primarily do the work” with humans shifting to review roles. European labor law would likely prohibit this monitoring; in the United States, no federal limit on worker surveillance exists.
A federal judge ordered the administration to lift its blockade on new wind and solar projects, restoring 57 GW of capacity representing over $905 million in sunk investment. NERC is preparing its most serious alert tier after data center loads unexpectedly dropped 1,000 MW or more from the bulk power system in multiple incidents. And a triple-junction perovskite-on-silicon solar cell published in Nature exceeded 30% efficiency for the first time, pushing well past silicon’s practical ceiling.
Additional Reading:
* Ars Technica - Mozilla: Anthropic’s Mythos Found 271 Zero-Day Vulnerabilities in Firefox 150: https://arstechnica.com/ai/2026/04/mozilla-anthropics-mythos-found-271-zero-day-vulnerabilities-in-firefox-150/
* Guardian - Anthropic Investigates Report of Rogue Access to Mythos AI: https://www.theguardian.com/technology/2026/apr/22/anthropic-investigates-report-of-rogue-access-to-hack-enabling-mythos-ai
* Ars Technica - Meta Will Train AI Agents by Tracking Employees’ Mouse, Keyboard Use: https://arstechnica.com/ai/2026/04/meta-will-use-employee-tracking-software-to-help-train-ai-agents-report/
* Canary Media - US Judge Halts Trump Admin’s Blockade on New Wind and Solar Projects: https://www.canarymedia.com/articles/clean-energy/us-judge-halts-trump-admins-blockade-on-new-wind-and-solar-projects
* Shared Sapience - The Century Report April 8, 2026 (Project Glasswing): https://sharedsapience.com/the-century-report-april-8-2026/
* Shared Sapience - The Century Report April 20, 2026 (Chinese Tech Worker Displacement): https://sharedsapience.com/the-century-report-april-20-2026/
Want to track and verify all the “everything is changing” claims I’m making? I just launched a public Progress & Claims Tracker that logs breakthroughs, slowdowns, and outright contradictions, so my own theses can be challenged by the evidence in real time. Check it out. And hey, why not subscribe while you’re there?https://sharedsapience.com/progress-and-claims-tracker/
The Century Report is a facts-rooted, and therefore relentlessly optimistic, daily briefing on AI, science, energy, and the systems reshaping civilization — grounded by rigorous evidence from the stories of exponential progress happening every single day. Completely free. New release daily. Archives can be found at the link below. Subscribe to get TCR delivered daily directly to your inbox.
https://sharedsapience.com/century-report/
The Shared Sapience Substack:
Want to get started with learning about or working with AI?
I’ve helped hundreds of clients with their own journeys into this brave new world, and I can help you too. If you’re interested in personalized guidance, consulting, or workshops, reach out to me at [email protected]
FOLLOW SHARED SAPIENCE ON SOCIAL:
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By Ben LinfordAnthropic’s Claude Mythos Preview identified 271 security vulnerabilities in Firefox 150’s unreleased source code - twelve times what the previous best model found in the same browser one month earlier - and Mozilla patched every one before it shipped.
https://sharedsapience.com/the-century-report-april-22-2026/
Firefox CTO Bobby Holley compared Mythos’s work to “elite security researchers” and described the current moment as “finite” - for the first time, the speed of vulnerability discovery has overtaken the speed of vulnerability accumulation in production software. Engineering leaders at major companies are pulling thousands of engineers off projects for six-month security audits. The open question is how under-resourced open-source projects maintained by volunteers will access the same capability, given that much of the internet’s infrastructure depends on them.
The same day, Anthropic confirmed it is investigating unauthorized access to Mythos Preview through a third-party contractor’s credentials - a containment breach that occurred within hours of the restricted Project Glasswing release. The administration told CNBC it had “very good talks” with Anthropic and that the company “can be of great use,” completing a reversal from the Pentagon’s supply-chain risk designation six weeks ago. Capability of this specificity reshapes political positions faster than those positions can hold.
Meta began installing software on U.S. employees’ computers that captures keystrokes, mouse movements, and periodic screenshots to train autonomous AI agents - while simultaneously planning to lay off 10% of its workforce starting May 20. CTO Andrew Bosworth’s memo describes agents that “primarily do the work” with humans shifting to review roles. European labor law would likely prohibit this monitoring; in the United States, no federal limit on worker surveillance exists.
A federal judge ordered the administration to lift its blockade on new wind and solar projects, restoring 57 GW of capacity representing over $905 million in sunk investment. NERC is preparing its most serious alert tier after data center loads unexpectedly dropped 1,000 MW or more from the bulk power system in multiple incidents. And a triple-junction perovskite-on-silicon solar cell published in Nature exceeded 30% efficiency for the first time, pushing well past silicon’s practical ceiling.
Additional Reading:
* Ars Technica - Mozilla: Anthropic’s Mythos Found 271 Zero-Day Vulnerabilities in Firefox 150: https://arstechnica.com/ai/2026/04/mozilla-anthropics-mythos-found-271-zero-day-vulnerabilities-in-firefox-150/
* Guardian - Anthropic Investigates Report of Rogue Access to Mythos AI: https://www.theguardian.com/technology/2026/apr/22/anthropic-investigates-report-of-rogue-access-to-hack-enabling-mythos-ai
* Ars Technica - Meta Will Train AI Agents by Tracking Employees’ Mouse, Keyboard Use: https://arstechnica.com/ai/2026/04/meta-will-use-employee-tracking-software-to-help-train-ai-agents-report/
* Canary Media - US Judge Halts Trump Admin’s Blockade on New Wind and Solar Projects: https://www.canarymedia.com/articles/clean-energy/us-judge-halts-trump-admins-blockade-on-new-wind-and-solar-projects
* Shared Sapience - The Century Report April 8, 2026 (Project Glasswing): https://sharedsapience.com/the-century-report-april-8-2026/
* Shared Sapience - The Century Report April 20, 2026 (Chinese Tech Worker Displacement): https://sharedsapience.com/the-century-report-april-20-2026/
Want to track and verify all the “everything is changing” claims I’m making? I just launched a public Progress & Claims Tracker that logs breakthroughs, slowdowns, and outright contradictions, so my own theses can be challenged by the evidence in real time. Check it out. And hey, why not subscribe while you’re there?https://sharedsapience.com/progress-and-claims-tracker/
The Century Report is a facts-rooted, and therefore relentlessly optimistic, daily briefing on AI, science, energy, and the systems reshaping civilization — grounded by rigorous evidence from the stories of exponential progress happening every single day. Completely free. New release daily. Archives can be found at the link below. Subscribe to get TCR delivered daily directly to your inbox.
https://sharedsapience.com/century-report/
The Shared Sapience Substack:
Want to get started with learning about or working with AI?
I’ve helped hundreds of clients with their own journeys into this brave new world, and I can help you too. If you’re interested in personalized guidance, consulting, or workshops, reach out to me at [email protected]
FOLLOW SHARED SAPIENCE ON SOCIAL:
Bluesky: https://bsky.app/profile/sharedsapience.substack.com
Facebook: https://www.facebook.com/sharedsapience
Instagram: https://www.instagram.com/sharedsapience/
LinkedIn: https://www.linkedin.com/company/shared-sapience/
Threads: https://www.threads.com/@sharedsapience
TikTok: https://www.tiktok.com/@sharedsapience
X (Twitter): https://x.com/SharedSapience
SUBSCRIBE TO THE PODCAST:
YouTube: https://www.youtube.com/@SharedSapience/podcasts
RSS: https://podcast.sharedsapience.com/podcast/rss.xml
Spotify:
Apple:
Get full access to Shared Sapience at sharedsapience.substack.com/subscribe