CVE-2026-75520

MEDIUMPre-NVD 5.45.4
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This medium-severity CVE scores 5.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3% (20th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source

Also known asEUVD-2026-112548 (ENISA EUVD)Source: ENISA EUVD

5.4EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 5.4Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Domoticz is a free, open source home automation system for Linux, Windows, macOS, and Raspberry Pi. Prior to 2026.3, the udevices JSON command handler, Cmd_UpdateDevices in main/WebServerCmds.cpp, performed no session.rights check before invoking a Lua parser script, while its sibling command handlers gate access by role. A low-privilege authenticated user could trigger execution of an existing operator-installed Lua parser script with attacker-controlled input through the GET /json.htm endpoint with type=command and param=udevices. The script parameter also lacked a .. path-traversal guard: CLuaHandler::executeLuaScript in main/LuaHandler.cpp constructed the filename from the parser directory and the supplied script name before passing it to luaL_loadfile. Execution is limited to already-installed valid Lua files; this is not arbitrary code execution, and the advisory states that file-write and upload paths require administrator privileges. This issue is addressed in version 2026.3.

CVSS v3
5.4
EG Score
5.4MEDIUMmedium confidence
EG Risk
24
EG Risk 24/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity54% × 45%
Impact severity (EG Severity): CVSS 5.4 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.3% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
20th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (5.4): severity, escalated by confirmed exploitation. This CVE's 5.4 is its impact severity (EG Severity), not escalated.

EG Severity
5.4 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-02). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

October 28, 2026

Last Modified

November 3, 2026

Advisory Details (5)

Auto-updated Nov 3, 2026
Patch available. Sources: github_release, github, github_commit.
Web page

libwebem/include/libwebem/session.h at dfe946fa32f4c211662e47ef55b8cedfc50a6a76 · domoticz/libwebem · GitHub

https://github.com/domoticz/libwebem/blob/dfe946fa32f4c211662e47ef55b8cedfc50a6a76/include/libwebem/session.h#L10-L17
GitHub release Patch Available

Stable Release 2026.3

Patch available: domoticz/domoticz 2026.3

https://github.com/domoticz/domoticz/releases/tag/2026.3
Web page

domoticz/main/WebServerCmds.cpp at 2026.3 · domoticz/domoticz · GitHub

https://github.com/domoticz/domoticz/blob/2026.3/main/WebServerCmds.cpp#L3445-L3451
GitHub commit Patch Available

commit 73ed0495af6d (domoticz/domoticz)

Patch available: domoticz/domoticz 2026.3 (contains commit 73ed0495af6d)

https://github.com/domoticz/domoticz/commit/73ed0495af6de3309f27cfc0091e803300ab5ccd
GitHub advisoryMentions a patch (unverified)

Missing authorization on the udevices command handler lets a low-privilege user invoke Lua parser scripts (secondary path traversal) · Advisory · domoticz/domoticz · GitHub

https://github.com/domoticz/domoticz/security/advisories/GHSA-8rv5-x8wv-c5c4

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 16× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed its CVE.org record (CNA or CISA ADP). An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

  1. 2026-11-12 16:34 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  2. 2026-11-11 16:40 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  3. 2026-11-10 16:45 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  4. 2026-11-09 16:36 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  5. 2026-11-08 16:40 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  6. 2026-11-07 16:39 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  7. 2026-11-06 16:39 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  8. 2026-11-05 16:38 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  9. 2026-11-04 16:36 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  10. 2026-11-03 16:49 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  11. 2026-11-03 14:29 UTCEchelonGraph re-scored
  12. 2026-11-03 13:55 UTCEchelonGraph re-scored
  13. 2026-11-02 16:46 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  14. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  15. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  16. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  17. 2026-10-28 23:26 UTCEchelonGraph re-scored
  18. 2026-10-28 23:01 UTCENISA EUVD ID recordedEUVD-2026-112548 · Source: ENISA EUVD
  19. 2026-10-28 22:33 UTCEchelonGraph re-scoredFirst assessed: 5.4 MEDIUM
  20. 2026-10-28 22:33 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-75520?
CVE-2026-75520 is a medium-severity vulnerability; its CVE record was published on October 28, 2026. Domoticz is a free, open source home automation system for Linux, Windows, macOS, and Raspberry Pi. Prior to 2026.3, the udevices JSON command handler, Cmd_UpdateDevices in main/WebServerCmds.cpp, performed no session.rights check before invoking a Lua parser script, while its sibling command…
When was the CVE record for CVE-2026-75520 published?
The CVE record for CVE-2026-75520 was published on October 28, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of November 3, 2026; the record at its source may have been updated since.
Is CVE-2026-75520 actively exploited?
CVE-2026-75520 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (20th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-75520?
CVE-2026-75520 has a CVSS base score of 5.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-75520?
A fix for CVE-2026-75520 is available: update to the fixed version the vendor names in its advisory.

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