- Published
- Source
- CSO Online UK
- Filed under
- UK industry, Attacks
Private keys associated with eight intermediate certificate authorities operated by Indian digital trust provider eMudhra have been compromised, potentially allowing attackers to forge trusted certificates and impersonate websites or services, according to Google and Mozilla. “On 17th October @ 20:06 UTC, Mozilla received a report to certificates@mozilla.org, forwarded by the Chrome Root program, that the private key of 8 eMudhra Intermediate certificates have been compromised,” Dennis Jackson, a member of Mozilla’s engineering team, wrote in a public Mozilla bug report.…
Practical steps for any organisation
- Patch quickly, starting with anything facing the internet.
- Use multi-factor authentication everywhere it is offered.
- Keep tested, offline backups – and a plan for the day you need them.
More helpNCSC: 10 Steps to Cyber Security (opens in a new tab)NCSC: incident management (opens in a new tab)
Defender’s notebook
The attacker technique behind this story, in MITRE’s terms – and what to check in your own estate.
Impersonation
StealthWhat a defender checks
- Confirm any change of payment details on a number you already hold – never the one in the message.
- Make the help desk verify identity before resetting passwords or MFA.
- Brief finance and help-desk staff on the current pretexts.
Build the skillBlue Team Analyst · Email & Phishing Investigation
© 2026 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation. MITRE ATT&CK and ATT&CK are registered trademarks of The MITRE Corporation.
MyCyberWay training
Blue Team Analyst
Every story here started as an alert. Learn to triage them.
Our Blue Team Analyst programme prepares you for a first SOC role: 26 live classes in UK hours, an alert queue worked in Microsoft Sentinel, and a full SOC shift simulation at the end. No security experience needed to start.
- Triage and KQL in Microsoft Sentinel
- Identity, endpoint, email and network investigations
- A verifiable digital badge
Headlines and short summaries only, except where a public body publishes under an open licence. Every story links to its publisher, who owns it. MyCyberWay does not edit or endorse third-party reporting.
