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Medium 5.4Known exploited (CISA KEV)Published Jun 11, 2021
CVE-2021-26829OpenPLC ScadaBR through 0.9.1 on Linux and through 1.12.4 on Windows allows stored XSS via system_settings.shtm.
Updated under an hour ago ()
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It affects scadabr. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Nov 28, 2025; federal agencies had to remediate by Dec 19, 2025. Treat that date as your deadline.
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OpenPLC ScadaBR through 0.9.1 on Linux and through 1.12.4 on Windows allows stored XSS via system_settings.shtm.
- CVSS
- 5.4 MEDIUM (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
- Weakness (CWE)
- CWE-79
- Known exploited
- Added to CISA KEV Nov 28, 2025; federal remediation due Dec 19, 2025Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- EPSS (exploitation in the next 30 days)
- 48.05% (percentile 99)
- Assigned by
- mitre
- NVD analysis
- Analyzed
- Record last updated
- Dec 2, 2025
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
scadabr scadabr scadabr:scadabr | through 0.9.1; through 1.12.4 | NVD |
References
- https://youtu.be/Xh6LPCiLMa8x-refsource-misc, exploit, third-party-advisory
- http://forum.scadabr.com.br/t/report-falhas-de-seguranca-em-versoes-do-scadabr/3615/4x-refsource-misc, vendor-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26829us-government-resource
- https://www.forescout.com/blog/anatomy-of-a-hacktivist-attack-russian-aligned-group-targets-otics/third-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.