Steam store goes down as Valve seemingly joins PHP vulnerability wave

The Steam store was briefly unavailable in both the client and web versions, returning an E502 L2 error, while game downloads and launches kept working. Valve gave no reason; the outage coincided with a CERT-EU warning about critical PHP vulnerabilities enabling remote code execution that prompted emergency takedowns of sites worldwide. The store was restored shortly after.

• Steam store returned E502 L2 errors in client and browser
• Downloads, updates and game launches, including online, kept working
• CERT-EU warned on October 21 of critical PHP RCE vulnerabilities
• Outage hit during the Steam Next Fest demo event