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Telstra

Telstra Vendor Cyber Rating & Cyber Score

telstra.com.au

We believe it’s people who give purpose to our technology. So we’re committed to staying close to our customers and providing them the best experience. And delivering the best tech. On the best network. Because our purpose is to build a connected future so everyone can thrive. We build technology and content solutions that are simple and easy to use, including Australia’s largest and fastest national mobile network. That’s why we strive to serve and know our customers better than anyone else – offering a choice of not just digital connection, but digital content as well. And that’s why we have an international presence spanning 15 countries, including China. In the 21st century, opportunity belongs to connected businesses,


Telstra A.I CyberSecurity Scoring

Telstra
Company Information
Website:https://www.telstra.com.au/careers
Employees number:35,254
Number of followers:435,969
NAICS:517
Industry Type:Telecommunications
Homepage:telstra.com.au
Telstra Risk Score (AI oriented)
Between 700 and 749
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TelstraTelecommunications
Updated:
02/04/2026
740/1000
Moderate
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Powered by our proprietary A.I cyber incident model
Insurance prefers TPRM score to calculate premium
Telstra Global Score (TPRM)
xxxx
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TelstraTelecommunications
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Findings

Telstra
TelstraModerate
Current Score
740Ba (MODERATE)
01000
6 incidents
-19 avg impact
Incident timeline with MITRE ATT&CK tactics, techniques, and mitigations.
JUNE 2026
743Before Incident
MAY 2026
743Before Incident
APRIL 2026
743Before Incident
MARCH 2026
739Before Incident
FEBRUARY 2026
736Before Incident
JANUARY 2026
733Before Incident
DECEMBER 2025
752Before Incident
Cyber Attack
28 Dec 2025Telstra
Canva, Adyen, Atlassian, HubSpot, Epic Games, Moderna, GameStop, ZoomInfo, WeWork, Halliburton, Betterment, Sonos and Telstra: Over 100 Organizations Targeted in ShinyHunters Phishing Campaign

ShinyHunters-Linked Cybercrime Campaign Targets Over 100 Major Organizations

733After Incident
CRITICAL-19
CANADYATLHUBEPIMODGAMZOOWEWHALBETSONTEL1769527593
ShinyHunters-Linked Cybercrime Campaign Targets Over 100 Major Organizations A recent cybercrime campaign attributed to the ShinyHunters group has targeted at least 100 organizations across multiple sectors, including software, finance, healthcare, and energy, according to cybersecurity firm Silent Push. Over the past 30 days, threat actors registered fake domains impersonating high-profile companies such as Atlassian, Adyen, Canva, Epic Games, HubSpot, Moderna, ZoomInfo, GameStop, WeWork, Halliburton, Sonos, and Telstra. The attackers employed voice phishing (vishing) tactics to compromise single sign-on (SSO) accounts, particularly those using Okta and other identity platforms. Using specialized phishing kits, they intercepted credentials and manipulated victims into bypassing multi-factor authentication (MFA) by convincing them to approve push notifications or submit one-time passcodes (OTPs). Okta described the attacks as involving real-time session orchestration, where threat actors guided victims through the authentication process via verbal instructions. While Silent Push identified the infrastructure used in the campaign, it remains unclear whether the attacks successfully breached any systems. However, ShinyHunters has claimed responsibility for data breaches at companies like Betterment, Crunchbase, and SoundCloud, all of which confirmed incidents. The group allegedly stole millions of records from these organizations as part of the Okta SSO vishing campaign. Silent Push attributes the campaign to Scattered LAPSUS$ Hunters, a collective formed last year by members of Lapsus$, Scattered Spider, and ShinyHunters, based on observed tactics, techniques, and procedures (TTPs). The incident follows recent warnings from Google and others about rising vishing and phishing attacks targeting identity platforms.
INCIDENT DETAILS -
TYPE
Phishing (Vishing), Data Breach, Credential Theft
MOTIVATION
Data Theft, Financial Gain, Credential Harvesting
IMPACT
Data Compromised: Millions of records allegedly stolenSystems Affected: SSO accounts (Okta and other identity platforms)Identity Theft Risk: High (PII and credentials compromised)
DATA BREACH
Type Of Data Compromised: Personally Identifiable Information (PII), Credentials, Business DataNumber Of Records Exposed: Millions (alleged)Sensitivity Of Data: High (PII, credentials)Data Exfiltration: Alleged (data sold on dark web)Personally Identifiable Information: Yes
NOVEMBER 2025
749Before Incident
OCTOBER 2025
748Before Incident
SEPTEMBER 2025
747Before Incident
AUGUST 2025
746Before Incident
JULY 2025
745Before Incident
OCTOBER 2022
742Before Incident
Breach
01 Oct 2022Telstra
Telstra

Telstra Data Breach

686After Incident
CRITICAL-56
TEL23611122
Australia's largest telecoms firm Telstra Corp Ltd suffered a data breach incident which affected around 30,000 current and former employees. The breach compromised basic information like names and email addresses.
INCIDENT DETAILS -
TYPE
Data Breach
IMPACT
namesemail addresses
DATA BREACH
namesemail addressesNumber Of Records Exposed: 30,000
MAY 2021
772Before Incident
Data Leak
01 May 2021Telstra
Telstra

Telstra Cyber Attack

717After Incident
CRITICAL-55
TEL15346123
Australian telecom firm Telstra was hit by a cyber attack result of which the hackers gained access to 10000 SIM cards. The compromised information included financial information, contracts, and banking information of the SIM card users. The company’s website has been offline for days after a hacker group said it infiltrated the company’s data systems and posted a disturbing ransom note on the dark web.
INCIDENT DETAILS -
TYPE
Data Breach
MOTIVATION
Ransom
IMPACT
financial informationcontractsbanking informationwebsiteDowntime: days
DATA BREACH
financial informationcontractsbanking information
JULY 2018
795Before Incident
Breach
01 Jul 2018Telstra
Telstra

Telstra Database Breach

736After Incident
HIGH-59
TEL025101122
A 63-year-old layman was been able to access a Telstra database containing the contact details of their customers. Once he signed in, he put in the search term “email” and it returned 66,500 results containing names, addresses, email addresses and phone numbers. Telstra has also since identified two other customers who were able to access the database.
INCIDENT DETAILS -
TYPE
Data Breach
IMPACT
NamesAddressesEmail AddressesPhone NumbersTelstra Database
DATA BREACH
Personal Information
MARCH 2018
795Before Incident
Vulnerability
01 Mar 2018Telstra
Telstra

Medical Software Flaw Exposes Australians' Medical Information

793After Incident
CRITICAL-2
TEL141210622
A flaw in medical software used by more than 40,000 Australian health specialists and distributed by Telstra has potentially exposed Australians' medical information to hackers. Hackers have been logging into practitioners' computers and servers to carry out illegal activities. The flaw in the "secure" messaging software is specifically leaving computers with remote desktop software installed wide open because it creates a separate username with a static default password that will allow for an easy intrusion.
INCIDENT DETAILS -
TYPE
Data Breach
MOTIVATION
Illegal activities
IMPACT
Data Compromised: Medical informationSystems Affected: Computers with remote desktop software
DATA BREACH
Type Of Data Compromised: Medical informationSensitivity Of Data: High
DECEMBER 2011
806Before Incident
Data Leak
01 Dec 2011Telstra
Telstra

Telstra BigPond Customer Data Breach

760After Incident
MEDIUM-46
TEL2211121222
TELSTRA faced another data privacy breach incident after the email addresses and phone numbers of more than a thousand of its BigPond customers were made accessible online. An online spreadsheet containing customer names, email addresses and details of service support issues, was exposed.
INCIDENT DETAILS -
TYPE
Data Breach
IMPACT
email addressesphone numberscustomer namesdetails of service support issues
DATA BREACH
email addressesphone numberscustomer namesdetails of service support issuesNumber Of Records Exposed: More than a thousand

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Telstra Cyber Scoring History | Rankiteo