Vercel change history: Failures logging in with Vercel CLI

Vercel reported a major incident causing login errors with Vercel CLI (`vc login`), preventing affected customers from signing in. It started at 2026-08-26 03:06 UTC and was resolved at 2026-08-26 04:28 UTC, lasting 1 h 22 min. The team reported identifying the source and testing a fix but did not specify the cause.