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CVE-2026-91778In affected versions of Octopus Server, users with certain scoped permission sets could execute arbitrary scripts on a worker (including…

Description

In affected versions of Octopus Server, users with certain scoped permission sets could execute arbitrary scripts on a worker (including the Octopus Server built-in worker). Incorrect permission validation during script execution would allow the script to execute without the user possessing the required authorisation.

Timeline

  1. ID reserved

    By Octopus

  2. Published

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-91778, by who scored it
Scored byCVSSScoreVector
OctopusCNA (assigner)4.0High7.2CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
NVDNVD · Awaiting Analysis4.0High7.2CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/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
EPSS (exploitation in 30 days)
0.43% · top 62% of all CVEs (13 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.2.

Affected products

  • Octopus Deploy · Octopus Server

    • affected 2019.0.0 – < 2026.1.11725
    • affected 2026.2.0 – < 2026.2.13344
    • affected 2026.3.0 – < 2026.3.11816

References

References1

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .