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VulnerabilityPublished Updated

CVE-2026-4436: GPL Odorizers GPL750 (XL4) · Missing Authentication

Affects GPL Odorizers GPL750 (XL4)Source CVE Database V5

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Not known to be exploited · CVSS 8.6 High : upgrade to v6.0 soon.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score
8.6High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.4% chance of exploitation in 30 days – higher than 38% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in v6.0, v20.0
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 9 Apr 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Upgrade GPL750 (XL4) and GPL750 (XL4 Prime) to v6.0; GPL Odorizers GPL750 (XL7) and GPL Odorizers GPL750 (XL7 Prime) to v20.0.

Affected software

ProductAffectedFixed in
GPL OdorizersGPL750 (XL4)Affected
  • >=1.0 <6.0
Fixed in
  • v6.0
GPL OdorizersGPL750 (XL4 Prime)Affected
  • >=4.0 <6.0
Fixed in
  • v6.0
GPL OdorizersGPL Odorizers GPL750 (XL7)Affected
  • >=13.0 <20.0
Fixed in
  • v20.0
GPL OdorizersGPL Odorizers GPL750 (XL7 Prime)Affected
  • >=18.4 <20.0
Fixed in
  • v20.0

Description

A low-privileged remote attacker can send Modbus packets to manipulate register values that are inputs to the odorant injection logic such that too much or too little odorant is injected into a gas line.

References

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