--- title: "CISA SB26-125: DeskTime TLS Flaw — CYFORi Blog" description: "CISA SB26-125: DeskTime TLS Flaw analysis for Texas SMBs." --- [CYFORi](https://cyfori.com/blog-articles/home.html?hsLang=en) [← Back to Blog](https://cyfori.com/blog-articles/blog.html?hsLang=en) Get Started CISA # CISA Vulnerability Bulletin SB26-125: DeskTime TLS Flaw Could Give Attackers Control of Your Team's Computers Published: May 6, 2026 | Source: CISA Vulnerability Bulletin SB26-125 **Published:** May 5, 2026 **Source:** CISA Vulnerability Bulletin SB26-125 — *Vulnerability Summary for the Week of April 27, 2026* **Original Article:** [https://www.cisa.gov/news-events/bulletins/sb26-125](https://www.cisa.gov/news-events/bulletins/sb26-125) --- ## Plain-English Summary: What Happened On May 5, 2026, CISA published Vulnerability Bulletin SB26-125, covering the week of April 27, 2026. Among the 25+ vulnerabilities documented in that bulletin, one stands out as an immediate, real-world threat to Texas small and medium businesses: **CVE-2025-10539 — a flawed TLS certificate validation in the DeskTime Time Tracking App that allows a man-in-the-middle attacker to execute arbitrary code on any employee's computer.** Here's how it works in practice: DeskTime is an automatic time-tracking tool installed on employees' computers that periodically checks for software updates over HTTPS. The vulnerability is dead simple: when the app verifies the update server's TLS certificate, it has a logic flaw that essentially says *"the certificate is valid as long as it's signed for the right hostname, even if the certificate chain is broken, self-signed, expired, or otherwise fraudulent."* > In layman's terms: **any attacker sitting between a Texas SMB's network and the internet can pretend to be DeskTime's update server, push a malicious installer, and get it automatically installed on every employee's computer — without anyone clicking anything.** SEC Consult discovered this flaw and initially reported that the vendor had **no patch and no timeline to deliver one**. By April 28, the vendor (DeskTime) did release patched version **1.3.674**, but the window between discovery and patch was zero-day territory for anyone caught in that gap. The exploitation requires the attacker to be in the network path — meaning anyone with access to your office Wi-Fi, any compromised router, an untrusted VPN connection, or the ability to perform a localized MITM attack (like Evil Twin Wi-Fi) could use this. ## Which Texas SMBs Are at Risk Right Now **DeskTime is widely used by SMBs.** It's marketed as *"a time tracker that won't interrupt your team's workflow"* and is positioned specifically at the small business / hybrid work management space. ### Who's most exposed: - **Remote-first and hybrid work SMBs** — Any business with 5-200 employees that uses DeskTime for time tracking, productivity monitoring, or payroll. - **Construction and trades companies** — Many use time tracking for field workers, project billing, and compliance. - **Legal and accounting firms** — These practices rely heavily on accurate time tracking for billing. - **Healthcare organizations** — Small to mid-size clinics, dental offices, and therapy practices that track staff hours. - **Any business on shared or public Wi-Fi** — Contractors working from coffee shops, co-working spaces, or job sites. ## What a Texas SMB Should Do This Week ### Immediate Actions (Do Today) 1. **Verify your DeskTime version:** Check that all installations are on v1.3.674 or later. 2. **Update every endpoint:** Force DeskTime to update on all employee machines, including remote and field workers. 3. **Review network logs:** Look for any signs of MITM activity on your office Wi-Fi in the past 7 days. ### This Week 1. **Audit all time-tracking tools:** Are there other SMB-relevant SaaS tools with known TLS flaws? 2. **Review VPN policies:** Ensure all remote workers connect through your corporate VPN, not public Wi-Fi. 3. **Scan for anomalies:** Watch for unexpected processes or network connections from time-tracking applications. ## Connection to CYFORi Services At CYFORi, we regularly help Texas SMBs with: - **vCISO services** — Proactive vulnerability management and patch strategy for your entire organization. - **Incident Response** — If you suspect a DeskTime-related compromise, our DFIR team can contain and investigate within hours. - **Compliance assessments** — Ensuring your cybersecurity posture meets Texas SB2610 and HIPAA requirements. - **Endpoint Protection** — Deploying next-gen EDR that detects MITM-based attacks at the endpoint level. ### Is Your Business at Risk? Get a free cybersecurity assessment from CYFORi's team. We'll identify your vulnerabilities and build a tailored defense strategy. Get Your Free Assessment → ← Previous — Next → [CyberWire: New Ransomware Trends →](https://cyfori.com/blog-articles/blog-articles/cyberwire-05052026.html?hsLang=en) © 2026 CYFORi. All rights reserved.