Back to blog

Follow and Subscribe

Simran Khalsa

Simran Khalsa

Staff Security Researcher

Simran is a Staff Security Researcher at Fastly where he focuses on threat intelligence, vulnerability research, and product innovation. He enjoys researching novel attack techniques and fortifying technology to prevent real-world web attacks. He has spent his career on both the offensive and defensive sides of the industry in both public and private sectors with an emphasis on building modern security solutions.

Page 1 of 2

CVE-2026-82329: JFrog Artifactory Authentication Bypass Exploitation ActivitySimran Khalsa, Fastly Security Research Team
Attacks targeting JFrog Artifactory (CVE-2026-82329) exploded in 72 hours. Fastly threat intelligence breaks down the mass scanning surge—and how our virtual patch protects you today.
ToolShell Remote Code Execution in Microsoft SharePoint: CVE-2025-53770 & CVE-2025-53771Simran Khalsa, Matthew Mathur, +1
Microsoft revealed two critical vulnerabilities, CVE-2025-53771 and CVE-2025-53770, actively exploited to compromise SharePoint servers.
Security
An illustration of a yellow, shining shield with a cracking gray shield peeling off of it
Smarter Security Operations: Embracing Detection-as-CodeSimran Khalsa, Gary Harrison, +1
Modernize security with Detection-as-Code. Learn how to automate threat detection & response using DevSecOps & tools like Fastly's WAF Simulator.
DevOpsSecurity+1
Security Without Speed Bumps: Why a WAF Simulator Transforms DevSecOps WorkflowsDaniel Corbett, Liam Mayron, +1
Learn about Fastly's WAF Simulator and how it transforms DevSecOps workflows by enabling integrated, continuous, and automated security testing.
DevOpsSecurity+1
DDoS in DecemberSimran Khalsa, David King, +1
Discover the latest trends and actionable insights on application DDoS attacks in December 2024. Strengthen your security with our expert analysis and guidance.
SecurityIndustry insights
Detection as Code with Fastly's WAF SimulatorSimran Khalsa, Fastly Security Research Team
Being able to test and validate rule behavior is critical to a maintainable WAF. With our WAF Simulator, you can validate rules in a safe simulation environment.
DevOpsEngineering+2
Active exploitation of unauthenticated stored XSS vulnerabilities in WordPress PluginsFastly Security Research Team, Simran Khalsa, +2
We have observed active exploitation attempts targeting three high-severity CVEs: CVE-2024-2194, CVE-2023-6961, and CVE-2023-40000.
SecurityIndustry insights
An illustration of a yellow, shining shield with a cracking gray shield peeling off of it
Cyber 5 Threat InsightsSimran Khalsa, Charlie Bricknell, +1
To gain a broader understanding of the threat landscape during "Cyber 5" weekend, we analyzed attack activities with a particular focus on commerce sites.
Industry insightsSecurity+1
WAF Simulator: Transforming DevSecOps WorkflowsFastly Security Research Team, Simran Khalsa
We're excited to announce Fastly's new WAF Simulator, which simplifies the testing process and provides the following key benefits.
DevOpsEngineering+1
Patch that Vuln! Identify, Triage, and Qualify CVEsFastly Security Research Team, Simran Khalsa
Vulnerabilities are an unfortunate inevitability. However, when using a WAF there are options for your security teams while waiting for a patch.
SecurityDevOps+1
Network Effect Threat Report: Uncovering the power of collective threat intelligenceFastly Security Research Team, Simran Khalsa, +3
Announcing the Network Effect Threat Report, Fastly’s threat intelligence report with insights based on unique data from April to June of 2023
SecurityIndustry insights+1
CVE-2023-34362: Progress MOVEit Transfer SQL Injection VulnerabilityFastly Security Research Team, Simran Khalsa, +3
What you need to know about CVE-2023-34362: Progress MOVEit Transfer SQL Injection Vulnerability
Security
Using Client Hints to Detect DisparitiesFastly Security Research Team, Simran Khalsa
Learn how User-Agent Client Hints work, explore privacy-related features and concerns, and how the partial adoption and incompleteness of this emerging standard can be used to detect behavior disparities.
DevOpsPrivacy+1
Automating and Defending Nefarious AutomationFastly Security Research Team, Simran Khalsa
If your application is on the internet, chances are it has been subjected to nefarious automation. These events can include many different attacks – including content scraping, credential stuffing, application DDoS, web form abuse, token guessing, and more.
Security
Spring: CVE-2022-22963 & Spring4Shell (CVE-2022-22965) | FastlyFastly Security Research Team, Xavier Stevens, +1
In this post, we review details for two RCE vulnerabilities impacting Spring Cloud and Spring Framework, including how Fastly customers can protect themselves from this vulnerability.
Security
How to Secure your GraphQLFastly Security Research Team, Simran Khalsa
There are many benefits to adopting GraphQL, but its security implications are less understood. In this post, we’ll explore those implications and offer guidance on which defaults and controls can support a safer GraphQL implementation.
EngineeringSecurity
WAF framework measures WAF effectiveness | FastlyFastly Security Research Team, Simran Khalsa, +1
Our new WAF efficacy framework provides a standardized way to measure the effectiveness of a WAF’s detection capabilities through continuous verification and validation. Here’s how it works.
EngineeringSecurity
Log4Shell attacks (CVE-2021-44228) insights | FastlyFastly Security Research Team, Xavier Stevens, +1
We’re sharing our latest data and new insights into the Log4j/Log4Shell vulnerability (CVE-2021-44228 + CVE-2021-45046) in this post in order to help the engineering community cope with the situation. We also share our guidance around testing your environment against many of the new obfuscation methods that have been seen.
Industry insightsSecurity
Log4Shell exploit found in Log4j | FastlyFastly Security Research Team, Xavier Stevens, +1
CVE-2021-44228 is a Remote Code Execution vulnerability in the Apache Log4j library being actively exploited. We provide our observations into the exploit and a summary of its impact.
SecurityEngineering
Atlassian Confluence OGNL Injection Vulnerability Protection | FastlyFastly Security Research Team, Xavier Stevens, +1
Our Security Research Team has built and deployed a rule to help protect customers of our next-gen WAF against the recently announced Confluence Server OGNL injection vulnerability, CVE-2021-26084.
Security