Oct 21, 2026 22:13:00

Various websites and apps, including Niconico and pixiv, are undergoing maintenance to support an emergency PHP patch.

A vulnerability has been discovered in PHP, a programming language used by numerous websites and applications. A security update and detailed information will be released at 11 PM JST on October 21, 2026. Many websites are currently undergoing maintenance to address this emergency patch.

Two serious vulnerabilities have been discovered in PHP, and security updates are scheduled to be released at 11 PM on October 21, 2026. Details of the vulnerabilities have not been released as of the time of writing, but both have been rated as having a severity of '9.2' on the Common Vulnerability Scoring System (CVSS 4.0), which means they could have a significant impact.

Two PHP vulnerabilities with a severity rating of '9.2' have been discovered, raising concerns about server hijacking. An emergency patch will be released on October 21st - GIGAZINE

Regarding the PHP vulnerability, the National Cyber Security Office has also issued a warning, stating, 'Please check whether your publicly accessible websites use PHP, and prepare to apply the fix patch, which will be released on October 21st at 11:00 PM (Japan time), as soon as possible.'

The PHP security team has issued a warning regarding two critical vulnerabilities. Please check if your publicly accessible websites use PHP and prepare to apply the fixes as soon as possible, with the patch to be released on October 21st at 11 PM (Japan time). https://t.co/TFPc8QIdUN

— National Cyber Security Office (Warning/Alert Information) (@cyber_forecast) October 21, 2026

Prime Minister Sanae Takaichi also posted a warning on X at 9:55 PM on October 21, 2026, calling it an 'urgent request for action tonight.'

This is an urgent request for everyone to take action tonight.

The PHP security team has issued a warning about two critical vulnerabilities in PHP, which is used on many websites.

— Sanae Takaichi (@takaichi_sanae) October 21, 2026

Many Japanese websites have already entered maintenance mode to apply emergency patches. pixiv will be undergoing maintenance until the early morning of October 22, 2026.

Niconico began maintenance on October 21, 2026 at 7 PM, and the end date and time are yet to be determined.

Bandai Channel will undergo maintenance from 8 PM on October 21, 2026, with no end date yet determined.

Animate's online store has also entered emergency maintenance.

Melonbooks will be undergoing maintenance from approximately 5:30 PM on October 21, 2026 to approximately 10:00 AM on October 22, 2026.

BASE entered maintenance at 3:50 PM on October 21, 2026, and is scheduled to be completed at 7:00 AM on October 22, 2026.

BOOK☆WALKE has also temporarily suspended its store until the early morning of October 22, 2026.

The impact is not limited to the website; the app is also affected. When I launched the Niconico Video app, the following screen appeared.

Various game apps will also undergo emergency maintenance. Pokémon Sleep will enter emergency maintenance from 11:00 PM on October 21, 2026.

[Emergency Maintenance Notice]

Due to system security measures, we will be performing emergency maintenance on 'Pokémon Sleep'.

Start date and time: Wednesday, October 21, 2026 23:00
End date and time: End time undecided

We will announce the estimated completion date of the maintenance on this account as soon as it is confirmed. … pic.twitter.com/rFPVOyHCiA

— Pokémon Sleep Official (@PokemonSleepApp) October 21, 2026

'Uma Musume Pretty Derby' will begin maintenance around 10:00 PM on October 21, 2026.

[Notice Regarding Change in Maintenance Start Time Due to PHP Vulnerability Fix]
To ensure the security of the system, the maintenance start time will be changed to approximately 10:00 PM on Wednesday, October 21st.
Please note that the start time may be changed again depending on the circumstances.

Please check the announcement for details. https://t.co/wUFQVFbh1q …

— Uma Musume Project Official Account (@uma_musu) October 21, 2026

Granblue Fantasy also began maintenance on October 21, 2026 at 10 PM.

[Notice Regarding Change in Maintenance Start Time Due to PHP Vulnerability Fix]
To ensure the security of the system, the maintenance start time will be changed to approximately 10:00 PM on Wednesday, October 21st.
Please note that the start time may be changed again depending on the circumstances. For details, please check the in-game announcements.

— Granblue Fantasy (@granbluefantasy) October 21, 2026

- Continued
PHP releases emergency updates '8.5.12', '8.4.27', '8.3.36', and '8.2.35' - GIGAZINE