Security readout for executives and security teams
This is a stored cross-site scripting issue in OpenPLC ScadaBR. An authenticated user can save malicious content in system settings that later runs in another user’s browser. Because CISA lists CVE-2021-26829 in KEV, treat affected deployments as a real-world exploitation concern, especially in OT environments. Exposure is likely limited to organizations running the named ScadaBR versions and exposing the web interface to users or networks where an attacker can authenticate. The source bundle provides no CPEs and no complete affected-product inventory, so asset validation is required. Prioritize this above a typical medium CVSS issue because it is KEV-listed and tied to OT/ICS reporting. The business risk is unauthorized script execution in operator browsers, which can support credential theft or misleading interface behavior. Mitigation focus: Inventory ScadaBR deployments and confirm operating system and version.; Restrict ScadaBR web access to trusted administrative networks.; Review vendor or project guidance for fixed versions or supported upgrade paths..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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CWE-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-26829 mapping review
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Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5.4 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CISA KEV status
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N2.32.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.4MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://youtu.be/Xh6LPCiLMa8CVE reference · x_refsource_MISC
- https://www.forescout.com/blog/anatomy-of-a-hacktivist-attack-russian-aligned-group-targets-otics/CVE reference · third-party-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26829CVE reference · government-resource
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.