CVE-2026-63353
CRITICAL 9.4Affected devices do not properly sanitize comment fields contained in imported trace files before rendering them on the Trace page. This could allow an attacker to social engineer an authorized user who holds the function right “Read diagnostics” into importing a specially crafted trace file. Successful exploitation could allow attacker-controlled JavaScript to execute in the user’s browser session and perform PLC operations through the web server within the scope of the user’s authorization.
Severe if exploited (CVSS 9.4), but no known exploitation and low modeled probability. Patch on a normal cadence.
Exploitation likelihood
0.3%chance of exploitation in 30 days · 24th percentile
Impact if exploited
9.4CVSS 4.0 · CRITICAL
- ConfidentialityHigh
- IntegrityHigh
- AvailabilityHigh
What an attacker needs
- ✓Access: Reachable over the network — no local access needed
- ✓Privileges: No account or privileges required
- ⚠User interaction: Requires active user interaction
- ✓Complexity: No special conditions — reliably repeatable
- ✓Requirements: No special attack requirements
✓ lowers the bar for an attacker · ⚠ raises it
Proof of concept
No public PoC is currently catalogued.
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Tracked sources are checked daily for recent CVEs, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.
Data snapshot:
Affected
Vendors Siemens
Products Simatic Drive Controller Cpu 1504d Tf Simatic Drive Controller Cpu 1507d Tf Simatic Et 200sp Cpu 1510sp F 1 Pn Simatic Et 200sp Cpu 1510sp 1 Pn Simatic Et 200sp Cpu 1512sp F 1 Pn Simatic Et 200sp Cpu 1512sp 1 Pn Simatic Et 200sp Cpu 1514sp F 2 Pn Simatic Et 200sp Cpu 1514sp 2 Pn Simatic Et 200sp Cpu 1514spt F 2 Pn Simatic Et 200sp Cpu 1514spt 2 Pn Simatic Et 200sp Open Controller Cpu 1515sp Pc (Incl. Siplus Variants) Simatic Et 200sp Open Controller Cpu 1515sp Pc2 (Incl. Siplus Variants) V2 Cpus Windows Os
Weakness (CWE)
- CWE-79: : Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
References and research data (JSON)
All CVSS metrics
- CRITICAL 9.6 v3.1 · CNA Primary
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H - CRITICAL 9.4 v4.0 · CNA Primary
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H - CRITICAL 9.4 v4.0 · NVD Secondary
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CRITICAL 9.6 v3.1 · NVD Secondary
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
References
Advisories
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-98384 EUVD · EUVD-2026-98384
Technical & other
- https://cert-portal.siemens.com/productcert/html/ssa-591731.htmlCVE record · siemens · Updated 2026-10-13T09:18:39.856Z
NVD · CVE-2026-63353 · Updated 2026-10-15T20:38:04.303