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West Pharmaceutical Services disclosed that it became the target of a cyberattack that resulted in records exfiltration and machine encryption.

The firm stated that it detected a compromise on Could well 4th. An investigation into the incident determined that the attacker stole records from the network.

“On Could well 7, 2026, West Pharmaceutical Services, Inc. determined that […it] has experienced a material cybersecurity attack, all the most sensible most likely scheme by scheme of which distinct records became exfiltrated by an unauthorized birthday party and distinct programs had been encrypted,” West Pharmaceutical Services notes in a submitting with the U.S. Securities and Alternate Commission (SEC).

“Upon preliminary detection of an intrusion on Could well 4, 2026, the firm promptly activated its incident response protocols, collectively with proactively taking programs offline globally for containment applications, notifying law enforcement, and interesting external cyber-forensic specialists.”

An investigation is at demonstrate underway to resolve the explicit nature and scope of the incident, and the vogue of files the attacker stole.

West Pharmaceutical Services is a publicly traded, S&P 500 American pharmaceutical manufacturing firm with annual revenues exceeding $3 billion and bigger than 10,800 workers globally.

The firm makes a speciality of injectable drug packaging, syringe and vial parts, containment programs, and drug shipping gadgets.

The cyberattack precipitated a response that inevitably disrupted the firm’s international trade operations.

The firm says it has restored its core endeavor programs that strengthen shipping and manufacturing operations, and manufacturing has been partly restarted.

Complete restoration of all programs has no longer yet been achieved, and no timeline for finalizing this restoration became equipped at the present.

In an identical style, the firm has no longer made any estimates concerning the incident’s fabric impression on its financials.

It’s worth noting that West Pharmaceutical Services stated that it has taken steps to mitigate the risk of the dissemination of the exfiltrated records, however hasn’t specified exactly what these steps are.

BleepingComputer has contacted the firm with a interrogate of for comments concerning the attack, its impression, and its new incident management device. A firm spokesperson stated that straight after detecting the intrusion, incident response and crisis management protocols had been activated.

“Following initial detection of an intrusion on May 4, 2026, West Pharmaceutical Services promptly implemented a series of technical and organizational measures to contain and mitigate the potential impact. This included the proactive shutdown and isolation of affected on-premise infrastructure for containment purposes, restriction of access to enterprise systems, and activation of further incident response and crisis management protocols, including notifying law enforcement.”

West Pharmaceutical Services also engaged Palo Alto Networks’ Unit 42 for incident response, containment, and recovery efforts, in coordination with varied external specialists and finest counsel.

No ransomware groups acquire taken credit for the attack on West Pharmaceutical Services at the time of writing.