CVE-2026-55761

Go/github.com/portainer/portainer CVE-2026-55761: medium 5.9, EPSS 0.49%

Portainer has Unauthenticated Restore Endpoint that Allows Admin Takeover on Uninitialized Instances

Action: Upgrade github.com/portainer/portainer to 2.39.4 or later.

go get github.com/portainer/portainer@v2.39.4

go get github.com/portainer/portainer@v2.43.0

Affected

Fixed versions

Sources

• osv: GHSA-x626-fcwx-f5pc
• https://github.com/portainer/portainer/security/advisories/GHSA-x626-fcwx-f5pc
• https://nvd.nist.gov/vuln/detail/CVE-2026-55761
• https://github.com/portainer/portainer/issues/2770
• https://github.com/portainer/portainer/commit/49f19107cf9a3540cbe406c9eb7f24390e1af02b
• https://github.com/portainer/portainer/commit/d2b56efcb4e43c4168bb6688eee9f6bf22867312
• https://github.com/portainer/portainer
• https://github.com/portainer/portainer/releases/tag/2.39.4
• https://github.com/portainer/portainer/releases/tag/2.43.0

CVE-2026-55761 · published 2026-08-28T20:28:19Z · modified 2026-09-02T19:55:44.937680570Z · JSON

Go/github.com/portainer/portainer CVE-2026-55761: unknown, EPSS 0.49%

Portainer has Unauthenticated Restore Endpoint that Allows Admin Takeover on Uninitialized Instances in github.com/portainer/portainer

Action: No fix published. Pin and monitor.

Affected

Fixed versions

No fixed version in the source.

Sources

• osv: GO-2026-6324
• https://github.com/portainer/portainer/security/advisories/GHSA-x626-fcwx-f5pc
• https://nvd.nist.gov/vuln/detail/CVE-2026-55761
• https://github.com/portainer/portainer/commit/49f19107cf9a3540cbe406c9eb7f24390e1af02b
• https://github.com/portainer/portainer/commit/d2b56efcb4e43c4168bb6688eee9f6bf22867312
• https://github.com/portainer/portainer/issues/2770
• https://github.com/portainer/portainer/releases/tag/2.39.4
• https://github.com/portainer/portainer/releases/tag/2.43.0

CVE-2026-55761 · published 2026-09-02T18:37:27Z · modified 2026-09-02T19:45:12.634762853Z · JSON