CVE-2021-26828
Confirmed PUBLISHEDOpenPLC ScadaBR through 0.9.1 on Linux and through 1.12.4 on Windows allows remote authenticated users to upload and execute arbitrary JSP files...
1 day faster than CISA KEV
Recommended Action
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
At a Glance
OpenPLC ScadaBR through 0.9.1 on Linux and through 1.12.4 on Windows allows remote authenticated users to upload and execute arbitrary JSP files via view_edit.shtm.
- CVE Published
- Jun 11, 2021
- Exploitation Reported
- Jun 01, 2026
- CVSS
- 8.8 High
- EPSS
- 39.1%
Affected Versions
| Vendor | Product | Version | Status |
|---|---|---|---|
| n/a |
n/a
|
n/a |
Affected |
CVE References
- youtu.be/k1teIStQr1A youtu.be · CVE Record https://youtu.be/k1teIStQr1A
- packetstormsecurity.com/files/162564/ScadaBR-1.0-1.1CE-Linux-Shell-U... packetstormsecurity.com · CVE Record http://packetstormsecurity.com/files/162564/ScadaBR-1.0-1.1CE-Linux-S...
- forum.scadabr.com.br/t/report-falhas-de-seguranca-em-versoes-do-s... forum.scadabr.com.br · CVE Record http://forum.scadabr.com.br/t/report-falhas-de-seguranca-em-versoes-d...
Recommended Actions
- Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
- Check enrichment artifacts for scanner coverage and available PoCs before rolling remediation validation.
- Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| CVE First | 2026-06-01 10:45 UTC |
| CISA | 2026-06-02 14:04 UTC |
No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users.
CVSS Scores
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
AV:N/AC:L/Au:S/C:P/I:P/A:P
Exploitation Status
Exploited in the wild
Recorded 2026-06-01 13:30:36 UTC · CISA
Proof of concept available
Recorded 2021-03-31 02:39:02 UTC · GitHub
Weaknesses (CWE)
-
Unrestricted Upload of File with Dangerous Type
Potential Proof of Concepts
These PoCs are unverified and could contain malware. Use at your own risk.
github · Created 2021-03-31 02:39:02 UTC · 3 stars
Timeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
14:04 UTC about 1 month ago14:04 UTC · about 1 month ago
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
10:45 UTC about 2 months ago10:45 UTC · about 2 months ago
Added to KEVIntel KEV Feed
High-confidence, third-party attested exploitation
-
11:10 UTC about 5 years ago11:10 UTC · about 5 years ago
CVE published
Vulnerability disclosed publicly
-
02:39 UTC over 5 years ago02:39 UTC · over 5 years ago
Public PoC available
Public proof-of-concept code published
-
00:00 UTC over 5 years ago00:00 UTC · over 5 years ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2021-26828
{
"cve_id": "CVE-2021-26828",
"title": "OpenPLC ScadaBR through 0.9.1 on Linux and through 1.12.4 on Windows allows r...",
"affected_vendor": "OpenPLC",
"affected_product": "ScadaBR",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "Confirmed",
"cvss_score": 8.8,
"epss_score": 0.39096,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}