OpenPLC ScadaBR through 0.9.1 on Linux and through 1.12.4 on Windows allows stored XSS via system_settings.shtm.
Priority HIGH 82Exploited in the wildCWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-79.
Summary
OpenPLC ScadaBR through 0.9.1 on Linux and through 1.12.4 on Windows allows stored XSS via system_settings.shtm.
Why it matters now
Exploitation Active In CISA KEV since 2025-11-28CISA due date 2025-12-19
EPSS 0.4805 98th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Active
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:scadabr:scadabr:*:*:*:*:*:*:*:* | up to 0.9.1 | Vulnerable | ScadaBR |
| cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Linux |
| cpe:2.3:a:scadabr:scadabr:*:*:*:*:*:*:*:* | up to 1.12.4 | Vulnerable | ScadaBR |
| cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Microsoft |
- cpe:2.3:a:scadabr:scadabr:*:*:*:*:*:*:*:* Versions up to 0.9.1 Vulnerable ·ScadaBR
- cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Linux
- cpe:2.3:a:scadabr:scadabr:*:*:*:*:*:*:*:* Versions up to 1.12.4 Vulnerable ·ScadaBR
- cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Microsoft
Remediation
No fixed version listed by the sources yet.
Timeline
- 2025-11-28 Added to CISA KEV
- 2026-10-02 Threatist record created from CVE-2021-26829
- 2026-10-03 Alias added: GHSA-6pvv-xrf9-29m6
References
More OpenPLC vulnerabilities
- TI-2021-08453 OpenPLC ScadaBR through 0.9.1 on Linux and through 1.12.4 on Windows allows remote… KEVCVSS 3.1HIGH 8.8
- TI-2024-22495 Stack-based buffer overflow in OpenPLC_v3 CVSS 3.1CRITICAL 9.8
- TI-2024-26520 Incorrect type conversion in OpenPLC_v3 CVSS 3.1HIGH 7.5
- TI-2024-26519 Incorrect type conversion in OpenPLC_v3 CVSS 3.1HIGH 7.5
- TI-2024-24528 Out-of-bounds read in OpenPLC_v3 CVSS 3.1HIGH 7.5
- TI-2024-24527 Out-of-bounds read in OpenPLC_v3 CVSS 3.1HIGH 7.5
Sources
- CVE-2021-26829 · CVE Program
- CVE-2021-26829 · NVD
- CISA Known Exploited Vulnerabilities
- FIRST EPSS
- GHSA-6pvv-xrf9-29m6 · GitHub Advisory Database · CC BY 4.0
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