CISA Sounds the Alarm: OpenPLC ScadaBR Flaw Joins the Vulnerability Hit List!
The U.S. CISA has added a flaw in OpenPLC ScadaBR to its Known Exploited Vulnerabilities Catalog. This cross-site scripting (XSS) vulnerability impacts Windows and Linux versions. Pro-Russian hacktivists recently exploited it to deface a honeypot, mistaking it for a water treatment plant.

Hot Take:
Ah, the joys of using default credentials! It’s like leaving your front door wide open and being surprised when someone strolls in and rearranges your furniture. Thanks to CISA’s latest addition, our dear friend CVE-2021-26829, the cybersecurity world is once again reminded that hackers don’t need to be James Bond to make a splash—sometimes they just need a little help from their friends, the default logins. Hats off to TwoNet for proving that hacking is just as much about creativity as it is about code.
Key Points:
- CISA added the OpenPLC ScadaBR flaw (CVE-2021-26829) to its Known Exploited Vulnerabilities catalog.
- The flaw is a cross-site scripting (XSS) issue impacting Windows and Linux versions of OpenPLC ScadaBR.
- Hacktivist group TwoNet exploited the flaw to deface an ICS/OT honeypot, mistaking it for a water treatment plant.
- FCEB agencies are required to fix the vulnerability by December 19, 2025, as per CISA’s directive.
- Experts urge private organizations to review and address vulnerabilities listed in the catalog.
